cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Global constraints on heavy neutrino mixing
Creators: name: Fernandez-Martinez, Enrique
name: Hernandez-Garcia, Josu
name: Lopez-Pavon, Jacobo
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive general constraints on the mixing of heavy Seesaw neutrinos with the SM fields from a global fit to present flavour and electroweak precision data. We explore and compare both a completely general scenario, where the heavy neutrinos are integrated out without any further assumption, and the more constrained case were only 3 additional heavy states are considered. The latter assumption implies non-trivial correlations in order to reproduce the correct neutrino masses and mixings as observed by oscillation data and thus some qualitative differences can be found with the more general scenario. The relevant processes analyzed in the global fit include searches for Lepton Flavour Violating (LFV) decays, probes of the universality of weak interactions, CKM unitarity bounds and electroweak precision data. In particular, a comparative and detailed study of the present and future sensitivity of the different LFV experiments is performed. We find a mild $1-2σ$ preference for non-zero heavy neutrino mixing of order 0.03-0.04 in the electron and tau sectors. At the $2σ$ level we derive bounds on all mixings ranging from 0.1 to 0.01 with the notable exception of the $e-μ$ sector with a more stringent bound of 0.005 from the $μ\to e γ$ process.
description: 29 pages, 29 figures. v2: minor typos corrected. Version accepted for publication in JHEP
Final Results of the European Project Flexcellence: Roll to Roll Technology for the Production of High Efficiency Low Cost Thin Film Solar Cells
Creators: name: Terrazzoni, V.
name: Haug, F.-J.
name: Söderström, T.
name: Ballif, C.
name: Fischer, D.
name: Soppe, W.
name: Bertomeu, J.
name: Fahland, M.
name: Schlemm, H.
name: Grimm, M.
name: Topic, M.
name: Wutz, M.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2831-2834
description: This paper reports on the final main results of the Flexcellence project. The project was running for 3 years
and its goal was the development of equipments and processes for cost-effective roll-to-roll production of high-efficiency
flexible thin-film silicon solar cells and modules. All aspects necessary for the successful implementation of the technology
could be considered simultaneously and at the end of the project, worldwide level results could be achieved; Indeed, the
feasibility of wide web coating of amorphous and microcrystalline layers by roll-to-roll Very High Frequency (VHF) Plasma
Enhanced Chemical Vapour Deposition (PECVD) was demonstrated with a new 50cm width VHF PECVD electrode
developed during the project, nano-textured substrates with very specific and advantageous optical properties were produced,
the three most promising Chemical Vapor Deposition processes for thin film silicon were investigated, solar cells up to 9.8%
stabilized efficiency were deposited on low cost plastic substrates and laboratory-scale VHF PECVD reactors, new insulating
and conductive inks, new parameters for laser scribing and a better-optimized laser patterning design led to improved series
connection process and higher module’s output power. Finally the work made on the encapsulation processes and reliability
testing led to significant breakthrough in the field of long-term outdoor stability of flexible modules on plastic foils.
Most of these developments were either directly industrially exploited by the partners or subjects of further investigations for
commercial use.
Linear stability of nonbidiagonal black holes in massive gravity
Creators: name: Babichev, Eugeny
name: Brito, Richard
name: Pani, Paolo
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider generic linear perturbations of a nonbidiagonal class of static black-hole solutions in massive (bi)gravity. We show that the quasinormal spectrum of these solutions coincides with that of a Schwarzschild black hole in general relativity, thus proving that these solutions are mode stable. This is in contrast to the case of bidiagonal black-hole solutions which are affected by a radial instability. On the other hand, the full set of perturbation equations is generically richer than that of a Schwarzschild black hole in general relativity, and this affects the linear response of the black hole to external perturbations. Finally, we argue that the generalization of these solutions to the spinning case does not suffer from the superradiant instability, despite the fact that the theory describes a massive graviton.
description: 13 pages, 2 figures; v2: References added; v3: matches published version; v4: acknowledgement added
title: Informatikstudierende als Teamplayer. Wie die Integration von Teamarbeit in die Lehre gelingen kann
Creators: name: Hawlitschek, Anja
name: Rudolf, Galina
name: Zug, Sebastian
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: kooperatives Lernen
subject: Collaboration Scripts
subject: didaktisches Design

description: Die Integration von Teamarbeit in die Lehre ist aus vielerlei Gründen didaktisch wünschenswert. In der Praxis zeigt sich jedoch oftmals, dass effektive Teamarbeit ein sorgfältiges didaktisches Design voraussetzt. Nachdem wir bei der DELFI 2021 das (partielle) Scheitern der Integration von Teamarbeit in eine Online-Lehrveranstaltung zur Softwareentwicklung vorgestellt und Gründe dafür analysiert haben, wollen wir in diesem Beitrag die didaktische Weiterentwicklung der Lehrveranstaltung in den Fokus nehmen. Wir beschreiben die durchgeführten didaktischen Analysen und das resultierende didaktische Design in Bezug auf Gruppenbildung, Lernaktivitäten und Strukturierung der Teamarbeit sowie die Umsetzung. Ergebnisse einer Logfileanalyse zeigen, dass die Studierenden in der weiterentwickelten Lehrveranstaltung signifikant mehr Teamarbeit beim Programmieren zeigen, GitHub-Funktionen signifikant öfter nutzen und signifikant mehr bearbeitete Aufgaben einreichen. Auf der Basis unserer Ergebnisse ziehen wir Rückschlüsse zur Integration von Teamarbeit in Lehrveranstaltungen der Informatik.
Ensemble nonequivalence in random graphs with modular structure
Creators: name: Garlaschelli, Diego
name: Hollander, Frank den
name: Roccaverde, Andrea
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Breaking of equivalence between the microcanonical ensemble and the canonical ensemble, describing a large system subject to hard and soft constraints, respectively, was recently shown to occur in large random graphs. Hard constraints must be met by every graph, soft constraints must be met only on average, subject to maximal entropy. In Squartini et al. (2015) it was shown that ensembles of random graphs are non-equivalent when the degrees of the nodes are constrained, in the sense of a non-zero limiting specific relative entropy as the number of nodes diverges. In that paper, the nodes were placed either on a single layer (uni-partite graphs) or on two layers (bi-partite graphs). In the present paper we consider an arbitrary number of intra-connected and inter-connected layers, thus allowing for modular graphs with a multi-partite, multiplex, block-model or community structure. We give a full classification of ensemble equivalence, proving that breakdown occurs if and only if the number of local constraints (i.e., the number of constrained degrees) is extensive in the number of nodes, irrespective of the layer structure. In addition, we derive a formula for the specific relative entropy and provide an interpretation of this formula in terms of Poissonisation of the degrees.
Medium Concentration System HSUN: Demonstration Results and Application of Several Silicon Cells
Creators: name: Mendes-Lopes, J.
name: Ramos, C.
name: Pina, L.
name: Filipa, F.
name: Coelho, S.
name: Wemans, J.
name: Sorasio, G.
name: Valtchev, S.
name: Andrade Pereira, N.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Terrestrial Concentrator Systems

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 717-721
description: The HSUN sytem is a new medium concentration photovoltaic (CPV) system, developed and produced
by WS Energia S.A. The low cost manufacturing and standard components used by HSUN® technology increases the
potential of the system to reach grid parity.
The system was designed to have stable performance and low cost manufacturing, with a total active collector area of
1.68 m2 and 6.3 kg/m2 of weight. Based on a 20X integrated parabolic trough with coupled reflective secondary
optics, the system uses expensive high efficiency silicon cells designed to operate under high levels of radiation, a
passive cooling integrated system and is integrated in 1-axis horizontal tracking structure, the WS CPV HORIZON®.
The open-chain configuration ensures that the wind drag is greatly reduced, increasing the reliability of the tracker,
while the optimized optics design enables a high acceptance angle and uniform distribution of radiation throughout
the PV receiver, using low-cost and low-weight components.
This paper is focus in two distinct areas: the HSUN system is and the demonstration results on field and a study of
several silicon solar cells as a solution for the high costs associated to the high-efficiency solar cells used in the
HSUN system.
Nanoscale Investigation of Intermediate Reflectors in Tandem Solar Cells with Randomly Textured Surfaces
Creators: name: Beckers, T.
name: Bittkau, K.
name: Carius, R.
name: Rockstuhl, C.
name: Lederer, F.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2793-2796
description: Dielectric intermediate reflectors in thin-film silicon tandem solar cells with randomly textured
interfaces are investigated by near-field scanning optical microscopy and rigorous diffraction theory. Emphasis is put
on the question how good the amorphous silicon top cell is optically matched to the microcrystalline silicon bottom
cell. We found in dependence on the thickness of the intermediate layer Fabry-Pérot oscillations for the absorption in
the top cell with a larger period compared to flat interfaces. Optimized thicknesses of intermediate reflectors can
improve the absorption by more than a factor of three in the weak absorbing wavelength region in an amorphous top
cell when compared to a solar cell without intermediate layer.
Ζητήματα προστασίας δεδομένων και προστασία πληροφοριοδοτών δημοσίου συμφέροντος (ΟΔΗΓΙΑ (EE) 2019/1937 ΤΟΥ ΕΥΡΩΠΑΪΚΟΥ ΚΟΙΝΟΒΟΥΛΙΟΥ ΚΑΙ ΤΟΥ ΣΥΜΒΟΥΛΙΟΥ)
Creators: name: Γιαννακίδου, Χριστίνα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: ΟΔΗΓΙΑ (EE) 2019/1937
Πληροφοριοδότες δημοσίου συμφέροντος
Γενικός Κανονισμός Προστασίας Δεδομένων
DIRECTIVE (EU) 2019/1937
Whistleblowers
GDPR

description: Σκοπός της διπλωματικής εργασίας ήταν η διερεύνηση των ζητημάτων προστασίας προσωπικών δεδομένων που ανακύπτουν από την 2019/1937 Οδηγία, πώς θεμελιώδη στοιχεία της νομοθεσίας των προσωπικών δεδομένων, όπως οι γενικές και ειδικές εγγυήσεις στην 2019/1937 Οδηγία επί της προστασίας των προσωπικών δεδομένων των αναφερόντων και των αναφερομένων, οι γενικές αρχές επί των προσωπικών δεδομένων, οι νομικές βάσεις επεξεργασίας και τα δικαιώματα των υποκειμένων των δεδομένων βρίσκουν εφαρμογή στο πλαίσιο της 2019/1937 Οδηγίας. Ιδιαίτερο ενδιαφέρον παρουσιάζουν τα δικαιώματα των υποκειμένων, ήτοι των αναφερόντων και των αναφερόμενων, τα οποία καθόλη τη διάρκεια των ερευνών μετά την υποβολή της αναφοράς (εσωτερικής-εξωτερικής-δημόσιες αποκαλύψεις) διαγράφουν μια σχέση αέναης πάλης και διαρκούς σύγκρουσης, την οποία η Ευρωπαϊκή Ένωση μέσα από την ως άνω Οδηγία επιχειρεί να εξισορροπήσει και να οριοθετήσει. Ερευνήθηκε επίσης η ύπαρξη σχετικής νομολογίας και παρουσιάζονται αποφάσεις ΔΕΕ και ΕΔΔΑ επί του θέματος της διπλωματικής εργασίας. Στα συμπεράσματα της διπλωματικής εργασίας γίνεται μια αποτίμηση της συμβολής της 2019/1937 Οδηγίας για την προστασία των προσωπικών δεδομένων των αναφερόντων και των αναφερομένων.
description: The purpose of the thesis was to investigate the personal data protection issues arising from the 2019/1937 Directive, how fundamental elements of the personal data legislation, such as the general and specific guarantees in 2019/1937 Directive on the protection of the personal data of the reporting persons and the persons concerned, the general principles on personal data, the legal bases of processing and the rights of the data subjects apply in the context of the 2019/1937 Directive. Of particular interest are the rights of the subjects, i.e. the reporting persons and the persons concerned, which throughout the investigations after the submission of the report (internal-external-public disclosures) form a relationship of perpetual struggle and permanent conflict, which the European Union in from the above Directive attempts to balance and delimit. The existence of relevant jurisprudence was also investigated and decisions of the CJEU and ECHR on the subject of the diplomatic thesis are presented. In the conclusions of the thesis, an assessment is made of the contribution of the 2019/1937 Directive for the protection of the personal data of the reporting persons and the persons concerned
Localized Plasmonic Effects at Metal Back Contacts of Thin-Film Silicon Solar Cells
Creators: name: Paetzold, U.W.
name: Haase, C.
name: Stiebig, H.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2779-2783
description: An assessment of the impact of localised plasmon induced optical losses at silver back contacts of thin-film silicon
solar cells is presented. The interaction of electromagnetic waves and nanoprotrusions on flat silver layers as well as
isolated silver nanoparticles were simulated with a three-dimensional numerical solver of Maxwell’s equations. From
the calculated power loss spectra the enhanced absorption which originates from a localised plasmonic resonance was
determined. Inside half-spherical and half-ellipsoidal silver protrusions on silver layers localized plasmonic
resonances were found to induce a significant absorption mechanism. The localised plasmon resonance wavelength
depends on the refractive index of the embedding material. In comparison to a μc-Si:H/Ag interface localized
plasmonic resonances at a ZnO/Ag interfaces shift to shorter wavelengths. In the latter case the resonances appear at
wavelengths where less light reaches the back contact of a thin-film silicon solar cell. The presented results strongly
suggest that localized plasmonic resonances play a crucial role at silver back contacts of thin-film silicon solar cells.
Σχολιασμένη μετάφραση αποσπασμάτων της μαρτυρίας Το Άουσβιτς και το μετά της Σαρλότ Ντελμπό
Creators: name: Γεωργάκη, Στεφανία Ευαγγελία Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Λογοτεχνική μετάφραση
Σχολιασμένη μετάφραση
Στρατοπεδική μαρτυρία
Literary translation
Annotated translation
Concentration camp testimony

description: Η παρούσα διπλωματική εργασία εκπονήθηκε στο πλαίσιο του Προγράμματος Μεταπτυχιακών Σπουδών «Γλωσσικές, Λογοτεχνικές και Διαπολιτισμικές Σπουδές στον Γαλλόφωνο και Ευρωπαϊκό Χώρο», κατεύθυνση «Μεταφρασεολογία-Μετάφραση Λογοτεχνίας και Επιστημών του Ανθρώπου» του Τμήματος Γαλλικής Γλώσσας και Φιλολογίας του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης, και περιλαμβάνει την παρουσίαση και τη σχολιασμένη μετάφραση από τα γαλλικά στα ελληνικά αποσπασμάτων από τη μαρτυρία της Γαλλίδας συγγραφέως Charlotte Delbo (Σαρλότ Ντελμπό, 1913-1985). Τα αποσπάσματα αντλούνται από τους δύο πρώτους τόμους της τριλογίας της με συλλογικό τίτλο Auschwitz et après (1970-1971). Στόχος είναι να εξεταστούν οι ποικίλες δυσκολίες που παρουσιάζει για τη μετάφραση ένα έργο μαρτυρίας, αλλά και να αναδειχτεί η ιδιαίτερη πένα της μάλλον άγνωστης στη χώρα μας συγγραφέως, η οποία συγκεράζοντας πρόζα και ποίηση, μνήμη και επινόηση, εξιστόρηση και ενδοσκόπηση, προσωπική και συλλογική ιστορία, δημιουργεί ένα έργο σημαντικό και γεμάτο προκλήσεις.
description: Le présent mémoire a été élaboré dans le cadre du programme des études master « Etudes linguistiques, littéraires et interculturelles dans l’environnement Français et Européen », spécialisation « Traductologie-traduction de littérature et sciences humaines » du Département de Langue et de Littérature Françaises de l’Université Aristote de Thessalonique. Le mémoire porte sur la présentation et la traduction annotée du français en grec des extraits choisis du témoignage de l’écrivaine française Charlotte Delbo (1913-1985). Les extraits sont tirés des deux premiers tomes de sa trilogie sous le titre collectif Auschwitz et après (1965-1971). Nous focalisons sur les difficultés diverses que présente pour la traduction un ouvrage de témoignage, et sur l’écriture particulière de cette écrivaine presque inconnue dans notre pays : mélangeant prose et poésie, mémoire et fiction, narration et introspection, histoire personnelle et histoire collective, Delbo crée une œuvre majeure pleine de défis.
Initial Conditions for Accurate N-Body Simulations of Massive Neutrino Cosmologies
Creators: name: Zennaro, Matteo
name: Bel, Julien
name: Villaescusa-Navarro, Francisco
name: Carbone, Carmelita
name: Sefusatti, Emiliano
name: Guzzo, Luigi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The set-up of the initial conditions in cosmological N-body simulations is usually implemented by rescaling the desired low-redshift linear power spectrum to the required starting redshift consistently with the Newtonian evolution of the simulation. The implementation of this practical solution requires more care in the context of massive neutrino cosmologies, mainly because of the non-trivial scale-dependence of the linear growth that characterises these models. In this work we consider a simple two-fluid, Newtonian approximation for cold dark matter and massive neutrinos perturbations that can reproduce the cold matter linear evolution predicted by Boltzmann codes such as CAMB or CLASS with a 0.1% accuracy or below for all redshift relevant to nonlinear structure formation. We use this description, in the first place, to quantify the systematic errors induced by several approximations often assumed in numerical simulations, including the typical set-up of the initial conditions for massive neutrino cosmologies adopted in previous works. We then take advantage of the flexibility of this approach to rescale the late-time linear power spectra to the simulation initial redshift, in order to be as consistent as possible with the dynamics of the N-body code and the approximations it assumes. We implement our method in a public code providing the initial displacements and velocities for cold dark matter and neutrino particles that will allow accurate, i.e. one-percent level, numerical simulations for this cosmological scenario.
description: 16 pages, 6 figures, 1 table (MNRAS, accepted). Code at https://github.com/matteozennaro/reps
title: Konzeption, Umsetzung und Evaluation einer Second-User-Komponente für eine VR-Lackierwerkstatt
Creators: name: Liebsch, Laurin
name: Weise, Matthias
name: Lucke, Ulrike
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: Virtual Reality
subject: virtuelle Lernanwendung
subject: Multi-User VR
subject: kollaboratives Lernen

description: Virtual Reality (VR) ist insbesondere durch den hohen Interaktionsgrad, der Immersion und dem damit verbundenen Präsenzerleben prädestiniert für kollaborative Lehr-Lernszenarien, in denen mehrere Lernende gemeinsam in einer virtuellen Umgebung agieren. Dieser Beitrag beschreibt eine Second-User-Komponente für ein VR-Lackierwerkstatt, die im Rahmen des Projekts HandLeVR umgesetzt wurde. Die Komponente ermöglicht es zwei Personen mit jeweils einem eigenen VR-Headset zusammen Lehr-Lernszenarien in der VR-Lackierwerkstatt zu durchlaufen.
Dense Axion Stars
Creators: name: Braaten, Eric
name: Mohapatra, Abhishek
name: Zhang, Hong
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: If the dark matter particles are axions, gravity can cause them to coalesce into axion stars, which are stable gravitationally bound systems of axions. In the previously known solutions for axion stars, gravity and the attractive force between pairs of axions are balanced by the kinetic pressure. The mass of these dilute axion stars cannot exceed a critical mass, which is about $10^{-14} M_\odot$ if the axion mass is $10^{-4}$~eV. We study axion stars using a simple approximation to the effective potential of the nonrelativistic effective field theory for axions. We find a new branch of dense axion stars in which gravity is balanced by the mean-field pressure of the axion Bose-Einstein condensate. The mass on this branch ranges from about $10^{-20} M_\odot$ to about $M_\odot$. If a dilute axion star with the critical mass accretes additional axions and collapses, it could produce a bosenova, leaving a dense axion star as the remnant.
description: 5 pages, 2 figures, Added calculations of unstable branch of axion stars. Added discussion of possible ways to detect dense axion stars. Removed EFT calculations that were not essential for this paper
Textured Glass for Silicon Thin Film Solar Cells
Creators: name: Bunte, E.
name: Zhang, W.
name: Worbs, J.
name: Siekmann, H.
name: Kirchhoff, J.
name: Gordijn, A.
name: Hüpkes, J.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2789-2792
description: Textured glass is prepared by ion beam treatment using wet chemically etched aluminium doped zinc
oxide films as three dimensional etching masks. The shape and rms roughness of the textured glass can be adjusted by
changing the initial ZnO thickness, wet chemical etching duration and ion beam etching parameters. The maximum
rms roughness we achieved is 228 nm, with lateral feature size larger than 2 m. Microcrystalline silicon thin film
solar cells grown on the textured glass show certain light trapping effect (Jsc = 20 mA/cm2). This proves that the
textured glass prepared by this method is suitable as an alternative substrate for thin film solar cells.
Self-consistent van der Waals density functional study of benzene adsorption on Si(100)
Creators: name: Hamamoto, Yuji
name: Hamada, Ikutaro
name: Inagaki, Kouji
name: Morikawa, Yoshitada
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The adsorption of benzene on the Si(100) surface is studied theoretically using the self-consistent van der Waals density functional (vdW-DF) method. The adsorption energies of two competing adsorption structures, butterfly (BF) and tight-bridge (TB) structures, are calculated with several vdW-DFs at saturation coverage. Our results show that recently proposed vdW-DFs with high accuracy all prefer TB to BF, in accord with more accurate calculations based on exact exchange and correlation within the random phase approximation. Detailed analyses reveal the important roles played by the molecule-surface interaction and molecular deformation upon adsorption, and we suggest that their precise description is prerequisite for accurate prediction of the most stable adsorption structure of organic molecules on semiconductor surfaces.
description: 9 pages, 4 figures, 2 tables
Preverbal negative markers in Buli
Creators: name: Schwarz, Anne
Publisher: name: Humboldt-Universität zu Berlin, Philosophische Fakultät II
Year: 1999
Subjects: subject: Informationsstruktur
subject: Afrikanische Sprachen
subject: 439 Andere germanische Sprachen
subject: 400 Sprachwissenschaft, Linguistik

description: This article deals with some aspects of negation in Buli, a Gur language spoken by the Bulsa people in Northern Ghana.
Dynamical Crossover in a Stochastic Model of Cell Fate Decision
Creators: name: Yamaguchi, Hiroki
name: Kawaguchi, Kyogo
name: Sagawa, Takahiro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We study the asymptotic behaviors of stochastic cell fate decision between proliferation and differentiation. We propose a model of a self-replicating Langevin system, where cells choose their fate (i.e. proliferation or differentiation) depending on local cell density. Based on this model, we propose a scenario for multi-cellular organisms to maintain the density of cells (i.e., homeostasis) through finite-ranged cell-cell interactions. Furthermore, we numerically show that the distribution of the number of descendant cells changes over time, thus unifying the previously proposed two models regarding homeostasis: the critical birth death process and the voter model. Our results provide a general platform for the study of stochastic cell fate decision in terms of nonequilibrium statistical mechanics.
description: 9 pages, 15 figures; revised discussion, appendix A, and figures
title: Beweiskompetenz durch Beweisassistenz
Creators: name: Karsten, Nadine
name: Nestmann, Uwe
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: Beweisassistent
subject: Beweiskompetenz
subject: Beweise
subject: Feedback
subject: Isabelle Einleitung

description: Beweiskompetenz, also die Fähigkeit mathematische Beweise sowohl verstehen als auch eigenständig führen zu können, wird üblicherweise vorrangig durch Beispiele, Feedback und Diskussion zwischen Lernenden und Lehrenden erworben. Wir setzen einen interaktiven Theorembeweiser – einen sogenannten Beweisassistenten – ein, um Lernenden ein zusätzliches möglichst direktes Feedback zu ermöglichen. Das Führen von Beweisen mit solchen Assistenten ähnelt der Entwicklung von Software mit schnellem und zuweilen spielerischem Explorieren von Lösungsansätzen. Wir erarbeiten daher die Konzeption eines dedizierten Kurses im Bereich der Theoretischen Informatik, in dem Beweiskompetenz mit passenden didaktischen Ansätzen durch Beweisassistenten effizienter und auch spielerischer vermittelt wird.
Bifacial Solar Cells with Boron Back Surface Field
Creators: name: Duran, C.
name: Buck, T.
name: Kopecek, R.
name: Libal, J.
name: Traverso, F.
Publisher: name: WIP-Munich
Year: 2010
Subjects: Wafer-Based Silicon Solar Cells and Materials Technology
Mono- and Multicrystalline Silicon Materials and Cells

description: 25th European Photovoltaic Solar Energy Conference and Exhibition / 5th World Conference on Photovoltaic Energy Conversion, 6-10 September 2010, Valencia, Spain; 2348-2352
description: The purpose of this work is to demonstrate an alternative process to a standard Al-full side device
which can be used for thin wafers. One way to do so is to process a passivated boron diffused rear side with an open
rear contact. The cell processed in this way has a better passivation on the rear and in addition is bi-facial allowing
light penetrating through the rear, increasing the power output. Most of the process steps have been optimized. With
this process sequence we established a homogeneous set of bifacial solar cells on Cz-Si material with similar
characteristics and efficiencies up to 17.3% under front side illumination. In order to assemble and build high power
output modules it is important to have similar short circuit currents in each bifacial solar cell. From a fifty cells batch
we obtained an average short circuit current of 35.4 [mA/cm2], constructing with these a 4x4 cells mini module for
testing. Test results show that the reflecting light can increase the power output of the module from 8% for grass
reflecting surface up to 19% for a high reflectance surface.
Attacks on practical quantum key distribution systems (and how to prevent them)
Creators: name: Jain, Nitin
name: Stiller, Birgit
name: Khan, Imran
name: Elser, Dominique
name: Marquardt, Christoph
name: Leuchs, Gerd
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: With the emergence of an information society, the idea of protecting sensitive data is steadily gaining importance. Conventional encryption methods may not be sufficient to guarantee data protection in the future. Quantum key distribution (QKD) is an emerging technology that exploits fundamental physical properties to guarantee perfect security in theory. However, it is not easy to ensure in practice that the implementations of QKD systems are exactly in line with the theoretical specifications. Such theory-practice deviations can open loopholes and compromise the security. Several of such loopholes have been discovered and investigated in the last decade. These activities have motivated the proposal and implementation of appropriate countermeasures, thereby preventing future attacks and enhancing the practical security of QKD. This article introduces the so-called field of quantum hacking by summarizing a variety of attacks and their prevention mechanisms.
description: Minor changes incl. improvements to figures and updated references
A duality-based path-following semismooth Newton method for elasto-plastic contact problems
Creators: name: Hintermüller, M.
name: Rösel, S.
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät
Year: 2016
Subjects: subject: elasto-plastic contact
subject: Fenchel duality
subject: path-following
subject: semismooth Newton
subject: 510 Mathematik

description: A Fenchel dualization scheme for the one-step time-discretized contact problem of quasi-static elasto-plasticity with combined kinematic-isotropic hardening is considered. The associated path is induced by a coupled Moreau-Yosida / Tichonov regularization of the dual problem. The sequence of solutions to the regularized problems is shown to converge strongly to the optimal displacement- stress-strain triple of the original elasto-plastic contact problem in the space-continuous setting. This property relies on the density of the intersection of certain convex sets which is shown as well. It is also argued that the mappings associated with the resulting problems are Newton- or slantly differentiable. Consequently, each regularized subsystem can be solved mesh-independently at a local superlinear rate of convergence. For efficiency purposes, an inexact path-following approach is proposed and a numerical validation of the theoretical results is given.
title: Requirements and Design of a Training System for Domestic Workers
Creators: name: Grimm, Valentin
name: Geiger, Laura
name: Rubart, Jessica
name: Faller, Gudrun
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: E-Learning
subject: Minority Group
subject: Gameful Design
subject: Gamification

description: Employees in household-related services have so far been neglected in research and practice. The overall goal of our project is to identify work-related stress of this special target group, develop recommendations, and disseminate them using low-threshold, attractive edutainment offers. In this context, this contribution presents a learning platform design for the special target group of domestic workers, such as gardeners or cleaners. The design is based on a requirements analysis with respect to this special target group, which we as well outline in this contribution.
Free cumulants, Schröder trees, and operads
Creators: name: Josuat-Vergès, Matthieu
name: Menous, Frédéric
name: Novelli, Jean-Christophe
name: Thibon, Jean-Yves
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: The functional equation defining the free cumulants in free probability is lifted successively to the noncommutative Faà di Bruno algebra, and then to the group of a free operad over Schröder trees. This leads to new combinatorial expressions, which remain valid for operator-valued free probability. Specializations of these expressions give back Speicher's formula in terms of noncrossing partitions, and its interpretation in terms of characters due to Ebrahimi-Fard and Patras.
description: 23 pages
Synthetic Dimensions for Cold Atoms from Shaking a Harmonic Trap
Creators: name: Price, Hannah M.
name: Ozawa, Tomoki
name: Goldman, Nathan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We introduce a simple scheme to implement synthetic dimensions in ultracold atomic gases, which only requires two basic and ubiquitous ingredients: the harmonic trap, which confines the atoms, combined with a periodic shaking. In our approach, standard harmonic oscillator eigenstates are reinterpreted as lattice sites along a synthetic dimension, while the coupling between these lattice sites is controlled by the applied time-modulation. The phase of this modulation enters as a complex hopping phase, leading straightforwardly to an artificial magnetic field upon adding a second dimension. We show that this artificial gauge field has important consequences, such as the counterintuitive reduction of average energy under resonant driving, or the realisation of quantum Hall physics. Our approach offers significant advantages over previous implementations of synthetic dimensions, providing an intriguing route towards higher-dimensional topological physics and strongly-correlated states.
description: 19 pages, 14 figures. Extended format version
Bidirectional roles of the Ccr4-Not complex in regulating autophagy before and after nitrogen starvation
Creators: name: Yin, Zhangyuan
name: Zhang, Zhihai
name: Lei, Yuchen
name: Klionsky, Daniel J.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Neuroscience
subject: Physiology
subject: Immunology
subject: FOS: Clinical medicine

description: Macroautophagy/autophagy is a highly conserved catabolic process by which cytoplasmic constituents are delivered to the vacuole/lysosome for degradation and recycling. To maintain cellular homeostasis and prevent pathologies, the induction and amplitude of autophagy activity are finely controlled through regulation of ATG gene expression. Here we report that the Ccr4-Not complex in Saccharomyces cerevisiae has bidirectional roles in regulating autophagy before and after nutrient deprivation. Under nutrient-rich conditions, Ccr4-Not directly targets the mRNAs of several ATG genes in the core autophagy machinery to promote their degradation through deadenylation, thus contributing to maintaining autophagy at the basal level. Upon starvation, Ccr4-Not releases its repression of these ATG genes and switches its role to promote the expression of a different subset of ATG genes, which is required for sufficient autophagy induction and activity. These results reveal that the Ccr4-Not complex is indispensable to maintain autophagy at the appropriate amplitude in both basal and stress conditions.Abbreviations: AID, auxin-inducible degron; Ape1, aminopeptidase I; Atg, autophagy related; Cvt, cytoplasm-to-vacuole targeting; DMSO, dimethyl sulfoxide; IAA, indole-3-acetic acid; PA, protein A; RIP, RNA immunoprecipitation.
Towards 35% Efficient Concentrator Modules Based on LPI Köhler Concentrators with External Confinement Cavities
Creators: name: Zamora Herranz, P.
name: Benítez, P.
name: Miñano, J.C.
name: Li, Y.
name: Buljan, M.
Publisher: name: WIP
Year: 2011
Subjects: Advanced Photovoltaics : New Concepts and Ultra-High Efficiency
Terrestrial Concentrator Systems

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 736-740
description: We present here an optical design for recovering the portion of light reflected by grid lines on
multijuncion cells. This new design is based on an external confinement cavity, an optical element able to redirect the
light reflected by the cell towards its surface again. It has been possible thanks to the recent invention of the advanced
Köhler concentrators by LPI, likely to integrate one of these cavities easily. This recovering light technique leads to
an important electrical efficiency increase for the CPV system. We have proven the excellent performance of these
cavities integrated in this kind of CPV modules. In the particular case of the FK concentrator, outstanding results
have been obtained: 33.2% module electrical efficiency @Tcell=25ºC and relative efficiency and Isc gains of over
6%.
Impacts of Decentralised MPPT Systems on the Performances of Photovoltaic Installations
Creators: name: Braisaz, B.
name: Kwiatkowski, G.
name: Plotton, A.
name: Tessier, D.
Publisher: name: WIP
Year: 2011
Subjects: Components for PV Systems
Balance of System Components

description: 26th European Photovoltaic Solar Energy Conference and Exhibition; 3680-3682
description: Different decentralized MPPT systems were tested on 3 kWp installations, in real conditions during
summer and autumn 2010 in Fontainebleau (Southern Paris area). After a period of non-shading testing, the
influence of different types of shadows was investigated (shadow of a chimney, triangular shadow, on one
module or on a part of several modules, etc.).
Without any shading, the interest of decentralized MPPT is limited: the energy gain is low or even negative
because of additional losses in the conversion stages. In the cases of particular shadings, the gain could be very
significant (from 15 to 20 % in some configurations). In some cases where the shadow impacts a lot of modules,
distributed MPPT boxes cannot get enough voltage for proper operation and the installation does not recover the
losses by voltage mismatch. These losses, which can be retrieved, were highlighted and evaluated during
campaigns of I-V curve measures.
In conclusion, these systems can have a real impact on the performance improvement of installations such as
Building Integrated PV installations, where generally the impact of shadows is unavoidable.
Some of these electronic devices were also tested under artificial sunlight in order to characterize their maximum
efficiency. In addition, this study also presents the experimental results of a reliability study on the systems.
Current-Voltage and Spectral Response Based Characterization of Thin Film Silicon Solar Cells – Investigation of Primary Error Sources
Creators: name: Reetz, W.
name: Kirchartz, T.
name: Lambertz, A.
name: Hüpkes, J.
name: Gerber, A.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2784-2788
description: This paper focuses on parasitic effects which might influence spectral response (SR) and current-voltage (IV)
measurements and can lead to major differences in Jsc (up to 22%) determined from SR- and IV-measurements. We
will discuss the impact of current collection, different substrate types and bias light intensity on the SR- and IVcharacteristics
of single, tandem and triple solar cells (a-Si:H, a-SiGe:H, μc-Si:H, a-Si:H/μc-Si:H). Some of these
effects can be reduced or eliminated – e.g. parasitic current collection can be minimized by electrically isolating the
solar cell (laser isolation). To reduce the influence of the spectral mismatch of a sun simulator and the standard
AM1.5g spectrum, a novel optical filter has been fabricated with which the optical mismatch according to the
standard IEC 60904-9 [1] could be reduced to ±9%.
Some Existence Results on Cantor Sets
Creators: name: Álvarez-Samaniego, Borys
name: Álvarez-Samaniego, Wilson P.
name: Ortiz-Castro, Jonathan
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 54A05, 54B05

description: The existence of two different Cantor sets, one of them contained in the set of Liouville numbers and the other one inside the set of Diophantine numbers, is proved. Finally, a necessary and sufficient condition for the existence of a Cantor set contained in a subset of the real line is given.
description: 11 pages, added some references, definitions and propositions
Surface and Structural Properties of AG/ZNO Reflectors on Flexible Substrates for Thin Film Silicon Solar Cells
Creators: name: Liu, C.
name: Zhou, L.
name: Ye, X.
name: Qian, Z.
name: Wang, X.
name: Chen, M.
Publisher: name: WIP-Munich
Year: 2009
Subjects: Thin Films Solar Cells
Amorphous and Microcrystalline Silicon Solar Cells

description: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2797-2799
description: The surface and structural properties of Ag/ZnO thin films are investigated, which are deposited on
flexible stainless steel substrates by RF magnetron sputtering. Hydrogenated amorphous silicon(a-Si:H) n-i-p solar
cells are fabricated on these Ag/ZnO Lambertian back reflectors. A clear correlation is found between the surface
morphology, crystallographic texture of back reflectors and the performances of solar cells, particularly the shortcircuit
currents and yields. The efficiencies of flexible a-Si:H/μc-Si:H(hydrogenated microcrystalline silicon) tandem
solar cells with optimized Ag/ZnO back reflectors reach 11.26% (AM1.5, 0.28cm2) and 6.15% (AM0, 22.12cm2).
title: Generation of Multiple True False Questions
Creators: name: Kasakowskij, Regina
name: Kasakowskij, Thomas
name: Seidel, Niels
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: automatic question generation
subject: true false questions
subject: assessment
subject: GPT-2 model
subject: NLP

description: Assessments are an important part of the learning cycle and enable the development and promotion of competencies. However, the manual creation of assessments is very time-consuming. Therefore, the number of tasks in learning systems is often relatively small. In this paper, we present an algorithm that can automatically generate an arbitrary number of German True False statements from a textbook using the GPT-2 model. The algorithm was evaluated with a selection of textbook chapters from four different academic disciplines and rated by domain experts. One-third of the generated MTF Questions are suitable for learning. The algorithm provides instructors with an easier way to create assessments on chapters of textbooks to test factual knowledge.
Search for relativistic magnetic monopoles with the AMANDA detector
Creators: name: Nießen, Peter
Publisher: name: Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I
Year: 2001
Subjects: subject: Magnetische Monopole
subject: AMANDA
subject: Cherenkovteleskop
subject: Obere Flußgrenze
subject: Magnetic Monopoles
subject: Cherenkov Telescope
subject: Upper Fluxlimit
subject: 530 Physik
subject: 29 Physik, Astronomie
subject: UO 6430

description: Diese Arbeit beschreibt die Suche nach relativistischen magnetischen Monopolen mit dem AMANDA Detektor. Die Methoden der Simulation und der Untergrundseparation werden erläutert. Keine Spuren mit der Signatur eines magnetischen Monopols wurden gefunden. Das sich ergebende Flusslimit von 0.61x10^-16 1/(cm^2 sr s) für Monopole, die sich nahe der Lichtgeschwindigkeit bewegen, liegt um einen Faktor 3-4 besser als die Ergebnisse vergleichbarer Untergrundexperimente und einen Faktor 16 unterhalb der Grenze, die aus der beobachteten Stabilität der galaktischen Magnetfelder liegt.
description: This thesis describes the search for relativistic magnetic monopoles with the AMANDA detector. The methods of their simulation and their separation from the background are given. No tracks with the signature of a magnetic monopoles are found, resulting in an upper limit on the flux of 0.61x10^-16 1/(cm^2 sr s) for monopoles with velocities close to the speed of light. This is better by a factor of 3-4 compared to results from other underground detectors and a factor of 16 below the limit derived from the observed stability of the galactic magnetic fields.
Oscillating Asymmetric Sneutrino Dark Matter from the Maximally $U(1)_L$ Supersymmetric Inverse Seesaw
Creators: name: Chen, Shao-Long
name: Kang, Zhaofeng
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The inverse seesaw mechanism provides an attractive approach to generate small neutrino mass, which origins from a tiny $U(1)_L$ breaking. In this paper, we work in the supersymmetric version of this mechanism, where the singlet-like sneutrino could be an asymmetric dark matter (ADM) candidate in the maximally $U(1)_{L}$ symmetric limit. However, even a tiny $δm$, the mass splitting between sneutrino and anti-sneutrino as a result of the tiny $U(1)_{L}$ breaking effect, could lead to fast oscillation between sneutrino and anti-sneutrino and thus spoils the ADM scenario. We study the evolution of this oscillation and find that a weak scale sneutrino, which tolerates a relatively larger $δm\sim 10^{-5}$ eV, is strongly favored. We also investigate possible natural ways to realize that small $δm$ in the model.
description: PLB version