cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Crystallization of mixed alkaline-earth carbonates in alkaline silica solutions at high pH
Creators: name: Eiblmeier, Josef
name: Dankesreiter, S.
name: Pfitzner, Arno
name: Schmalz, G.
name: Kunz, Werner
name: Kellermeier, Matthias
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: The ability of silica to influence the mineralization of alkaline-earth carbonates is an outstanding example for the formation of biomimetic structures in the absence of any organic matter. Under suitable conditions, silica-stabilized carbonate nanocrystals can spontaneously self-assemble into hierarchical materials with complex morphologies, commonly referred to as “silica biomorphs”. However, growth of these crystal aggregates has largely been restricted to the higher homologues in the alkaline-earth series, i.e., SrCO3 and BaCO3, while corresponding architectures of the much more relevant calcium carbonate are quite difficult to realize. To systematically address this problem, we have crystallized metal carbonates in the presence of silica at high pH, using barium and strontium chloride solutions that contained increasing molar fractions of Ca2+. The resulting materials were analyzed with respect to their composition, structure, and crystallography. The obtained data demonstrate that the growth process is already strongly affected by small amounts of calcium. Indeed, morphologies typically observed for SrCO3 and BaCO3 remained absent above certain thresholds of added Ca2+. Instead, globular and hemispherical structures were generated, owing to fractal branching of carbonate crystals as a consequence of poisoning by silica. These alterations in the growth behavior are ascribed to relatively strong interactions of hard calcium ions with silicate species in solution, shifting their speciation toward higher oligomers and even inducing partial coagulation. This notion is confirmed by additional experiments at increased ionic strength. Our results further demonstrate that the observed hemispherical particles exhibit distinct polymorphism, with orthorhombic solid solutions (aragonite-type (Sr,Ca)CO3 and (Ba,Ca)CO3) being formed at lower Ca2+ contents, whereas Sr2+/Ba2+-substituted calcite prevails at higher Ca2+ fractions. In the case of Ba2+/Ca2+ mixtures, there is moreover an intermediate range where virtually identical morphologies were confirmed to be Ba2+-doped vaterite. These findings extend the variety of structures and compositions accessible in these simple systems, and may explain difficulties previously encountered in attempts to prepare CaCO3 biomorphs at standard conditions.
Coherent THz emission of Bi_2Sr_2CaCu_2O_8 intrinsic Josephson junction stacks in the hot spot regime
Creators: name: Wang, H. B.
name: Guenon, S.
name: Gross, B.
name: Yuan, J.
name: Jiang, Z. G.
name: Zhong, Y. Y.
name: Gruenzweig, M.
name: Iishi, A.
name: Wu, P. H.
name: Hatano, T.
name: Koelle, D.
name: Kleiner, R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report on THz emission measurements and low temperature scanning laser imaging of Bi_2Sr_2CaCu_2O_8 intrinsic Josephson junction stacks. Coherent emission is observed at large dc input power, where a hot spot and a standing wave, formed in the "cold" part of the stack, coexist. By varying the hot spot size the cavity resonance frequency and the emitted radiation can be tuned. The linewidth of radiation is much smaller than expected from the quality factor of the cavity mode excited. Thus, an additional mechanism of synchronization seems to play a role, possibly arising from nonequilibrium processes at the hot spot edge.
description: 4.1 pages, 5 figures
TNFα signalling primes chromatin for NF-κB binding and induces rapid and widespread nucleosome repositioning
Creators: name: Diermeier, Sarah Daniela Helena
name: Kolovos, Petros
name: Heizinger, Leonhard
name: Schwartz, Uwe
name: Georgomanolis, Theodore
name: Zirkel, Anne
name: Wedemann, Gero
name: Grosveld, Frank
name: Knoch, Tobias A.
name: Merkl, Rainer
name: Cook, Peter R.
name: Längst, Gernot
name: Papatonis, Argyris
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 570 Biowissenschaften, Biologie

description: Background The rearrangement of nucleosomes along the DNA fiber profoundly affects gene expression, but little is known about how signalling reshapes the chromatin landscape, in three-dimensional space and over time, to allow establishment of new transcriptional programs. Results Using micrococcal nuclease treatment and high-throughput sequencing, we map genome-wide changes in nucleosome positioning in primary human endothelial cells stimulated with tumour necrosis factor alpha (TNFα) - a proinflammatory cytokine that signals through nuclear factor kappa-B (NF-κB). Within 10 min, nucleosomes reposition at regions both proximal and distal to NF-κB binding sites, before the transcription factor quantitatively binds thereon. Similarly, in long TNFα-responsive genes, repositioning precedes transcription by pioneering elongating polymerases and appears to nucleate from intragenic enhancer clusters resembling super-enhancers. By 30 min, widespread repositioning throughout megabase pair-long chromosomal segments, with consequential effects on three-dimensional structure (detected using chromosome conformation capture), is seen. Conclusions Whilst nucleosome repositioning is viewed as a local phenomenon, our results point to effects occurring over multiple scales. Here, we present data in support of a TNFα-induced priming mechanism, mostly independent of NF-κB binding and/or elongating RNA polymerases, leading to a plastic network of interactions that affects DNA accessibility over large domains.
Access to Analysis and Climate Indices Tools for Climate Researchers and End Users
Creators: name: Pagé, Christian
name: Spinuso, Alessandro
name: Bärring, Lars
name: Zimmermann, Klaus
name: Aoun, Abel
Publisher: name: Zenodo
Year: 2022
Subjects: climate indices
climate indicators
data analysis
climate change

description: Researchers and end users using climate data face a challenge when they analyze the data they need. Data volumes are increasing very rapidly, and the ability to download all needed data is often no longer possible. Most of the climate analysis tools for research and application needs must use very large datasets, often distributed among several data centres and into a large quantity of files. This is especially true when they are stored in a federated architecture like the ESGF. One of these tools is icclim (https://github.com/cerfacs-globc/icclim ), a flexible python software package to calculate climate indices and indicators. This tool adhere as much as possible to metadata conventions such as CF, implementing also provenance information. It also aims at providing increasing support for all FAIR aspects. It is designed with performance and optimisation in mind, because the goal is to provide on-demand calculations for users. It provides the implementation of most of the international standard climate indices such as ECAD, ETCCDI, ET-SCI, including the correct methodology for calculating percentile indices using the bootstrapping method. It has been validated against R.Climdex as well (https://cran.r-project.org/web/packages/climdex.pcic/index.html ). The new 5.x version of icclim is now based on functions from the xclim python library, which was inspired by earlier versions of icclim, but using xarray and dask for data access and processing. icclim is also a candidate as the software to calculate climate indices for the C3S toolbox (https://cds.climate.copernicus.eu/cdsapp#!/toolbox ). An example of a complex analysis tool used in climate research and adaptation studies is a tool to follow storm tracks. In the context of climate change, it is important to know if storm tracks will change in the future, in both their frequency and intensity. Storms can cause significant societal impacts, hence it is important to assess future patterns. These tools are integrated in the IS-ENES C4I 2.0 platform (https://climate4impact.eu/ ), using a Jupyter notebook collection in a SWIRRL environment (Software for Interactive Reproducible Research Labs https://gitlab.com/KNMI-OSS/swirrl ). Having access to this type of complex analysis tool is very useful, and integrating them with front-ends like C4I enable the use of those tools by a larger number of researchers and end users. This project (IS-ENES3) has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement N°824084.
The Isoperimetric Profile of a Noncompact Riemannian Manifold for Small Volumes
Creators: name: Nardulli, Stefano
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C21, 58J60, 58-99, 28-99, 49-99

description: In the main theorem of this paper we treat the problem of existence of minimizers of the isoperimetric problem under the assumption of small volumes. Applications of the main theorem to asymptotic expansions of the isoperimetric problem are given.
description: 33 pages, improved version after the referee comments, (Submitted)
Manipulation of the Charge State of Single Au Atoms on Insulating Multilayer Films
Creators: name: Steurer, W.
name: Repp, Jascha
name: Gross, L.
name: Scivetti, I.
name: Persson, M.
name: Meyer, G.
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: We show charge-state manipulation of single Au adatoms on 2–11 monolayer (ML) thick NaCl films on Cu surfaces by attaching or detaching single electrons via the tip of an atomic force microscope (AFM). Tristate charge control (neutral, negatively charged, and positively charged) is achieved. On Cu(100) and Cu(111) supports, charge tristability is achieved independently of the NaCl layer thickness. In contrast, on Cu(311), only Au anions are stable on the thinnest NaCl films, but neutral and positive charge states become sufficiently long lived on films thicker than 4 ML to allow AFM-based charge-state-manipulation experiments.
Representations of multidimensional linear process bridges
Creators: name: Barczy, Matyas
name: Kern, Peter
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J25, 60G15, 60H10, 60J35

description: We derive bridges from general multidimensional linear non time-homogeneous processes using only the transition densities of the original process giving their integral representations (in terms of a standard Wiener process) and so-called anticipative representations. We derive a stochastic differential equation satisfied by the integral representation and we prove a usual conditioning property for general multidimensional linear process bridges. We specialize our results for the one-dimensional case; especially, we study one-dimensional Ornstein-Uhlenbeck bridges.
description: 37 pages
UX Monocerotis as a W Serpentis binary
Creators: name: Sudar, D.
name: Harmanec, P.
name: Lehmann, H.
name: Yang, S.
name: Božić, H.
name: Ruždjak, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using our new photometric and spectroscopic observations as well as all available published data, we present a new interpretation of the properties of the peculiar emission-line binary UX Mon. We conclude that this binary is in a rare phase of fast mass transfer between the binary components prior to the mass ratio reversal. We firmly establish that the orbital period is secularly decreasing at a rate of $\dot{P}=-0.260$ seconds per year. From several lines of reasoning, we show that the mass ratio of the component losing mass to the mass-gaining component $q$ must be larger than 1 and find our most probable value to be $q=1.15\pm0.1$. The BINSYN suite of programs and the steepest descent method were used to perform the final modeling. We modeled the star as a W Ser star with a thick disk around its primary. Although the remaining uncertainties in some of the basic physical elements describing the system in our model are not negligible, the model is in fair agreement with available observations. Only the nature of the light variations outside the primary eclipse remains unexplained.
Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution
Creators: name: Eisele, Max
name: Cocker, Tyler L.
name: Huber, Markus A.
name: Plankl, Markus
name: Viti, L.
name: Ercolani, D.
name: Sorba, L.
name: Vitiello, Miriam S.
name: Huber, Rupert
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: Phase-locked ultrashort pulses in the rich terahertz spectral range1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 have provided key insights into phenomena as diverse as quantum confinement7, first-order phase transitions8, 12, high-temperature superconductivity11 and carrier transport in nanomaterials1, 6, 13, 14, 15. Ultrabroadband electro-optic sampling of few-cycle field transients1 can even reveal novel dynamics that occur faster than a single oscillation cycle of light4, 8, 10. However, conventional terahertz spectroscopy is intrinsically restricted to ensemble measurements by the diffraction limit. As a result, it measures dielectric functions averaged over the size, structure, orientation and density of nanoparticles, nanocrystals or nanodomains. Here, we extend ultrabroadband time-resolved terahertz spectroscopy to the sub-nanoparticle scale (10 nm) by combining sub-cycle, field-resolved detection (10 fs) with scattering-type near-field scanning optical microscopy (s-NSOM)16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26. We trace the time-dependent dielectric function at the surface of a single photoexcited InAs nanowire in all three spatial dimensions and reveal the ultrafast (<50 fs) formation of a local carrier depletion layer.
Photonic Crystal-Based Sensing and Imaging of Potassium Ions
Creators: name: Fenzl, Christoph
name: Kirchinger, Michael
name: Hirsch, Thomas
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: photonic crystal; chemical sensor; hydrogel; RGB readout; potassium sensing; imaging
subject: 540 Chemie

description: We report on a method for selective optical sensing and imaging of potassium ions using a sandwich assembly composed of layers of photonic crystals and an ion-selective membrane. This represents a new scheme for sensing ions in that an ionic strength-sensitive photonic crystal hydrogel layer is combined with a K+-selective membrane. The latter consists of plasticized poly(vinyl chloride) doped with the K+-selective ion carrier, valinomycin. The film has a red color if immersed into plain water, but is green in 5 mM KCl and purple at KCl concentrations of 100 mM or higher. This 3D photonic crystal sensor responds to K+ ions in the 1 to 50 mM concentration range (which includes the K+ concentration range encountered in blood) and shows high selectivity over ammonium and sodium ions. Sensor films were also imaged with a digital camera by exploiting the RGB technique.
Calculi, Hodge operators and Laplacians on a quantum Hopf fibration
Creators: name: Landi, Giovanni
name: Zampini, Alessandro
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We describe Laplacian operators on the quantum group SUq (2) equipped with the four dimensional bicovariant differential calculus of Woronowicz as well as on the quantum homogeneous space S2q with the restricted left covariant three dimensional differential calculus. This is done by giving a family of Hodge dualities on both the exterior algebras of SUq (2) and S2q . We also study gauged Laplacian operators acting on sections of line bundles over the quantum sphere.
description: v3, one reference corrected, one reference added. 31 pages
Synthesis, Structural Characterization, and Physical Properties of Cs2Ga2S5, and Redetermination of the Crystal Structure of Cs2S6
Creators: name: Friedrich, D.
name: Pielnhofer, F.
name: Schlosser, Marc
name: Weihrich, Richard
name: Pfitzner, Arno
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: cesium; density functional calculations; gallium; solid-state structures; sulfur
subject: 540 Chemie

description: The reaction of CsN3 with GaS and S at elevated temperatures results in Cs2Ga2S5. Its crystal structure was determined from single-crystal X-ray diffraction data. The colorless solid crystallizes in space group C2/c (no. 15) with V=1073.3(4) Å3 and Z=4. Cs2Ga2S5 is the first compound that features one-dimensional chains equation image[Ga2S3(S2)2−] of edge- and corner-sharing GaS4 tetrahedra. The vibrational band of the S22− units at 493 cm−1 was revealed by Raman spectroscopy. Cs2Ga2S5 has a wide bandgap of about 3.26 eV. The thermal decomposition of CsN3 yields elemental Cs, which reacts with sulfur to provide Cs2S6 as an intermediate product. The crystal structure of Cs2S6 was redetermined from selected single crystals. The red compound crystallizes in space group equation image with V=488.99(8) Å3 and Z=2. Cs2S6 consists of S62− polysulfide chains and two Cs positions with coordination numbers of 10 and 11, respectively. Results of DFT calculations on Cs2Ga2S5 are in good agreement with the experimental crystal structure and Raman data. The analysis of the chemical bonding behavior revealed completely ionic bonds for Cs, whereas Ga[BOND]S and S[BOND]S form polarized and fully covalent bonds, respectively. HOMO and LUMO are centered at the S2 units.
Integrability of Differential-Difference Equations with Discrete Kinks
Creators: name: Scimiterna, C.
name: Levi, D.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In this article we discuss a series of models introduced by Barashenkov, Oxtoby and Pelinovsky to describe some discrete approximations to the ϕ^4 theory which preserve travelling kink solutions. We show, by applying the multiple scale test that they have some integrability properties as they pass the A_1 and A_2 conditions. However they are not integrable as they fail the A_3 conditions.
description: submitted to the Proceedings of the workshop "Nonlinear Physics: Theory and Experiment.VI" in a special issue di Theoretical and Mathematical Physics
Harnack's Inequality for Parabolic De Giorgi Classes in Metric Spaces
Creators: name: Kinnunen, J.
name: Marola, N.
name: Miranda, M.
name: Paronetto, F.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 30L99, 31E05, 35K05, 35K99, 49N60

description: In this paper we study problems related to parabolic partial differential equations in metric measure spaces equipped with a doubling measure and supporting a Poincare' inequality. We give a definition of parabolic De Giorgi classes and compare this notion with that of parabolic quasiminimizers. The main result, after proving the local boundedness, is a scale and location invariant Harnack inequality for functions belonging to parabolic De Giorgi classes. In particular, the results hold true for parabolic quasiminimizers.
Onsager relations in a two-dimensional electron gas with spin-orbit coupling
Creators: name: Gorini, Cosimo
name: Raimondi, Roberto
name: Schwab, Peter
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 530 Physik

description: Theory predicts for the two-dimensional electron gas with only a Rashba spin-orbit interaction a vanishing spin Hall conductivity and at the same time a finite inverse spin Hall effect. We show how these seemingly contradictory results are compatible with the Onsager relations: The latter do hold for spin and particle (charge) currents in the two-dimensional electron gas, although (i) their form depends on the experimental setup and (ii) a vanishing bulk spin Hall conductivity does not necessarily imply a vanishing spin Hall effect. We also discuss the situation in which extrinsic spin orbit from impurities is present and the bulk spin Hall conductivity can be different from zero.
D5.4 Governance models, Sustainability analysis and Roadmap
Creators: name: Carapinha, Jorge
name: Darzanos, George
name: Kalogiros, Costas
name: Papakonstantinopoulou, Katia
name: Karadimou, Demi
name: Dimakis, Antonis
name: Stamoulis, George D.
name: Deans, Paul
name: Muschamp, Paul
name: Caruso, Giuseppa
name: Gavras, Anastasius
name: Lopez, Diego
name: Hanne-Stine Hallingby
name: Tranoris, Christos
name: Kostis Trantzas
name: Frias, Zoraida
name: Hernandez, Jose Felix
Publisher: name: Zenodo
Year: 2021
Subjects: Business Models, Governance Models, Business KPIs, Sustainability, Profitability

description: In this report: (𝑖) we introduce and assess the sustainability of novel business models for the different actors interacting in the 5G-VINNI experimentation platform for offering Experimentation as a Service (EaaS) to verticals, (𝑖𝑖) we define and evaluate the suitability of a variety of governance models to rule the collaboration of Operators of the 5G-VINNI facility sites and (𝑖𝑖𝑖) we employ Business Key Performance Indicators (KPIs) to assess the business success of the operation of the 5G-VINNI experimentation platform during the last year of the project. To define the business models of the involved actors, we employ the concepts of value network and business model canvas. The sustainability of the proposed business models is assessed under different instances of the introduced value network and conditions of the 5G vertical markets conditions, for which all potential sources of costs and revenues are properly captured. Our study suggests that a conservative business model should be selected by the Operators of 5G-VINNI facility sites when a 5G vertical market is dominated by few “large” Service Providers. On the other hand, when multiple “small” Service Providers are active in a 5G vertical market, then the Operators of should select a more aggressive Business model. Furthermore, we introduce governance models for the provisioning of Network Slice as a Service (NSaaS) across the infrastructure of multiple 5G-VINNI facility sites, under both centralised and distributed structures. For each of these structures, we develop and assess certain policies and rules that guarantee the profitability of the involved Operators of the 5G-VINNI facility sites, for both cooperative and coopetitive (cooperative competition) modes. Our analysis suggests that the Operators of 5G-VINNI facility sites should adopt a centralized cooperative mode when the customers’ demand and the number of facility sites is increased. On the other hand, when the customers’ demand is low, the distributed models can perform an adequate performance. Finally, we assess the business success of the 5G-VINNI experimentation platform by means of appropriate Business KPIs, that capture the engagement and experience of vertical customers, the experimentation intensity, the stakeholders’ innovation, the entry barriers of vertical customers and the degree of collaboration of 5G-VINNI platform members. The analysis shown that for most of the Business KPIs the target values were achieved.
Biogeochemical cycling of copper in the Northeast Pacific Ocean : role of marine heterotrophic bacteria
Creators: name: Posacka, Anna
Publisher: name: University of British Columbia
Year: 2017

description: Copper (Cu) is important in regulating microbial activity in the ocean, as it can act both as a limiting nutrient and a toxic inhibitor depending on its concentration. Yet, our knowledge of its biogeochemical cycle is limited in many oceanic regions including the subarctic Northeast (NE) Pacific, as is our knowledge of Cu nutrition in marine heterotrophic bacteria. To address this, I investigated Cu biogeochemical cycling along a coastal‒oceanic transect, Line P, in the subarctic NE Pacific (Chapter 2). I also explored physiological responses to varying Cu availability (limiting to sufficient) of taxonomically diverse heterotrophic bacteria, which include isolates from surface waters of the Line P transect (Flavobacteriia member: Dokdonia sp. Dokd-P16, and Gammaproteobacteria members Pseudoalteromonas sp. strain PAlt-P2 [coastal] and PAlt-P26 [oceanic]), and a member of the marine Roseobacter clade within class Alphaproteobacteria (Ruegeria pomeroyi DSS-3). Several important processes were identified to moderate dissolved Cu along Line P. These include fluvial and sedimentary inputs (near the coast), upwelling of deep, Cu-rich waters in the Alaskan gyre (offshore), atmospheric inputs (offshore), as well as scavenging within the intermediate waters of the Oxygen Minimum Zone (OMZ) across the transect. Bacterial responses to changing Cu availability were diverse. Flavobacteriia member Dokd-P16 reduced its growth rate, carbon metabolism, and Cu quota (Cu:P) under Cu limitation, but enhanced its Mn quota. In contrast, both Pseudoalteromonas spp. were mostly unaffected by different Cu levels. Ruegeria pomeroyi maintained constant growth rates but moderated quotas of several metals (under low Cu: decreased Cu and Co, but increased Mn and Fe quotas), and some aspects of its C metabolism. These findings illuminate on the role of Cu in shaping bacterial species composition in the ocean, and the bacterially-mediated cycles of carbon and bioactive metals (i.e. Fe, Zn, Mn, Co). Copper quotas of heterotrophic bacteria are similar to those of cultured marine phytoplankton. Estimates of Cu partitioning between these planktonic groups in the euphotic zone of the NE Pacific revealed that up to 50% of biogenic Cu could be associated with bacterial biomass. Therefore, marine heterotrophic bacteria should not be overlooked in studies of Cu biogeochemical cycling.
A Rational Approach to Cryptographic Protocols
Creators: name: Caballero-Gil, P.
name: Hernández-Goya, C.
name: Bruno-Castañeda, C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: This work initiates an analysis of several cryptographic protocols from a rational point of view using a game-theoretical approach, which allows us to represent not only the protocols but also possible misbehaviours of parties. Concretely, several concepts of two-person games and of two-party cryptographic protocols are here combined in order to model the latters as the formers. One of the main advantages of analysing a cryptographic protocol in the game-theory setting is the possibility of describing improved and stronger cryptographic solutions because possible adversarial behaviours may be taken into account directly. With those tools, protocols can be studied in a malicious model in order to find equilibrium conditions that make possible to protect honest parties against all possible strategies of adversaries.
Visible light photocatalytic reduction of aldehydes by Rh(III)–H: a detailed mechanistic study
Creators: name: Ghosh, Tamal
name: Slanina, Tomas
name: König, Burkhard
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 540 Chemie

description: The chemoselective photoreduction of aldehydes in the presence of ketones was achieved using triethanolamine (TEOA) as sacrificial electron donor, proflavine (PF) as photocatalyst and [Cp*Rh(III)(bpy) Cl]Cl (Rhcat) as mediator. The reducing agent, which reacts with the carbonyl group was found to be [Cp*Rh(III)(bpy)H]Cl (Rh(III)–H). Contrary to formate-based reduction, its slow photochemical in situ generation enables to kinetically distinguish aldehydes from ketones. The inherent reactivity difference of the carbonyl compounds is transferred by the method into synthetically useful reaction selectivities. The substrate scope is broad with excellent yields. A detailed study of the reaction mechanism reveals that the photoreduction of the PF triplet and the subsequent reduction of the Rhcat leading to Rh(III)–H represents the major reaction pathway, which is highly oxygen sensitive. The oxidative quenching of the PF singlet state by Rhcat is a competing mechanism, which prevails in non-degassed systems.
description: Open Access Komponente aus der Allianzlizenz
Dominated Splittings for Flows with singularities
Creators: name: Araujo, Vitor
name: Arbieto, Alexander
name: Salgado, Luciana
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 37D30, 37D25

description: We obtain sufficient conditions for an invariant splitting over a compact invariant subset of a $C^1$ flow $X_t$ to be dominated. In particular, we reduce the requirements to obtain sectional hyperbolicity and hyperbolicity.
description: 15 pages, 4 figures; streamlined presentation; statement and proof of main theorem corrected; included new application to obtain hyperbolicity for three-dimensional flows; some corrections suggested by the referee
title: The Role of International Financial Integration in Monetary Policy Transmission
Creators: name: Wu, Jing
name: Xie, Yinxi
name: Zhang, Ji
Publisher: name: Bank of Canada
publisherIdentifier: https://ror.org/05cc98565
publisherIdentifierScheme: ROR
Year: 2024

description: Motivated by empirical evidence, we propose an open-economy New Keynesian model with financial integration that allows financial intermediaries to hold foreign long-term bonds. We find financial integration features an amplification for a domestic monetary policy shock and a negative spillover for a foreign shock. These results hold for conventional and unconventional monetary policies. Among various aspects of financial integration, the bond duration plays a major role, and our results cannot be replicated by a standard model of perfect risk sharing between households. Finally, we observe an important interaction between financial integration and trade openness and demonstrate trade alone does not have an economically meaningful impact on monetary policy transmission.
description: À la lumière d’observations empiriques, nous proposons un modèle néokeynésien d’économie ouverte avec intégration financière qui permet aux intermédiaires financiers de détenir des obligations à long terme émises par des entités étrangères. Nous constatons que l’intégration financière amplifie les effets d’un choc de politique monétaire interne et qu’elle a des répercussions négatives dans le cas d’un choc d’origine étrangère. Ces résultats se vérifient pour les politiques monétaires traditionnelles et non traditionnelles. Parmi les différents aspects de l’intégration financière, la durée des obligations joue un rôle majeur, et nos résultats ne peuvent être reproduits par un modèle standard de partage parfait des risques entre les ménages. Enfin, nous observons une interaction importante entre l’intégration financière et l’ouverture au commerce et démontrons que les échanges commerciaux n’ont à eux seuls pas d’impact économiquement significatif sur la transmission de la politique monétaire.
Theory of scanning gate microscopy
Creators: name: Gorini, Cosimo
name: Jalabert, Rodolfo A.
name: Szewc, Wojciech
name: Tomsovic, Steven
name: Weinmann, Dietmar
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: A systematic theory of the conductance measurements of noninvasive (weak probe) scanning gate microscopy is presented that provides an interpretation of what precisely is being measured. A scattering approach is used to derive explicit expressions for the first- and second-order conductance changes due to the perturbation by the tip potential in terms of the scattering states of the unperturbed structure. In the case of a quantum point contact, the first-order correction dominates at the conductance steps and vanishes on the plateaux where the second-order term dominates. Both corrections are nonlocal for a generic structure. Only in special cases, such as that of a centrally symmetric quantum point contact in the conductance quantization regime, can the second-order correction be unambiguously related with the local current density. In the case of an abrupt quantum point contact, we are able to obtain analytic expressions for the scattering eigenfunctions and thus evaluate the resulting conductance corrections.
Hadronic Electroweak Spin-Torsion Interactions
Creators: name: Fabbri, Luca
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a previous paper we considered the most general field equations for a system of two fermions of which one single-handed, showing that the spin-torsion interactions among these spinors had the same structure of the electroweak forces among leptons; in this paper we consider the most general field equations for a system of two fermions, showing that the spin-torsion interactions among these spinors have a structure similar to that of the electroweak forces among hadrons: possible differences are discussed, and consequently further extensions are speculated.
description: 6 pages
Revenue Management for Cloud Computing Providers: Decision Models for Service Admission Control under Non-probabilistic Uncertainty
Creators: name: Püschel, Tim
name: Schryen, Guido
name: Hristova, Diana
name: Neumann, Dirk
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: admission control, informational uncertainty, revenue management, cloud computing
subject: 004 Informatik

description: Cloud computing promises the flexible delivery of computing services in a pay-as-you-go manner. It allows customers to easily scale their infrastructure and save on the overall cost of operation. However Cloud service offerings can only thrive if customers are satisfied with service performance. Allow-ing instantaneous access and flexible scaling while maintaining the service levels and offering competitive prices poses a significant challenge to Cloud Computing providers. Furthermore services will remain available in the long run only if this business generates a stable revenue stream. To address these challenges we introduce novel policy-based service admission control mod-els that aim at maximizing the revenue of Cloud providers while taking in-formational uncertainty regarding resource requirements into account. Our evaluation shows that policy-based approaches statistically significantly out-perform first come first serve approaches, which are still state of the art. Furthermore the results give insights in how and to what extent uncertainty has a negative impact on revenue.
Modulation and roles of stress-responsive proteins in coxsackievirus infection
Creators: name: Qiu, Ye
Publisher: name: University of British Columbia
Year: 2017

description: Viral myocarditis is an inflammatory heart disease caused by viral infection, which is a major cause of sudden death in children and young adults. Among the various viruses, coxsackievirus B3 (CVB3) is a predominant pathogen of viral myocarditis. As CVB3 replication is tightly tangled with signaling pathways in host cells, an in-depth study of CVB3-host interactions would promote the understanding of the pathogenesis of viral myocarditis and provide critical drug targets for the development of therapeutics. CVB3 infection induces different types of stress in host cells, and in turn, the cells respond to the stress via expressing certain stress-responsive proteins (SRPs) to counteract the stress for cell survival. During the co-evolution of virus and host, CVB3 has developed sophisticated strategies to modulate and utilize SRPs to benefit its own replication. The main objective of this dissertation is to investigate the modulation and functional roles of SRPs in CVB3 infection and CVB3-induced myocardium damage. I hypothesize that 1) CVB3 infection differentially regulates the expression and activity of SRPs at transcription, translation or post-translation level; 2) the dysregulation of SRPs benefits CVB3 replication and promotes CVB3-induced cell damage. This dissertation mainly focuses on two SRPs, the inducible heat shock 70 kDa protein (Hsp70) and nuclear factor of activated T-cell 5 (NFAT5), during CVB3 infection. Using in vitro (cell culture) and in vivo (mouse) models, I demonstrated an increase of Hsp70 but a decrease of NFAT5 during CVB3 infection. Further studies elucidated the mechanism underlying such changes as well as the feedback effects on CVB3 replication. Hsp70 was upregulated via CaMKII-HSF1 signaling cascade activated in CVB3 infection and in turn promoted CVB3 infectivity via stabilizing viral genome and benefiting viral translation. NFAT5 was cleaved by CVB3 proteases 2A and 3C, generating a 70 kDa dominant negative truncate, which inhibited the iNOS-mediated anti-viral activity of NFAT5. Together, my findings have uncovered the new roles of SRPs in CVB3 infection and potential novel drug targets for CVB3-induced myocarditis.
title: La gestion des comportements difficiles au sein de deux établissements d'enseignement spécialisé
title: La gestion des comportements difficiles au sein de deux établissements d'enseignement spécialisé
titleType: AlternativeTitle
Creators: name: Demierre, Nadia
name: Carreto Sesmonde, Lucía
Publisher: name: Unknown
Year: 0
Subjects: subject: Sentiment d’efficacité personnelle
subject: Stratégies de coping
subject: Gestion de classe
subject: Difficultés comportementales
subject: Enseignement spécialisé

description: La gestion de comportements difficiles représente un défi pour de nombreux professionnels, notamment en enseignement spécialisé. Ce mémoire s’intéresse à la perception de la difficulté en gestion de comportements difficiles des enseignants spécialisés de deux écoles spécialisées vaudoises. Notre recherche a comme objectif d’identifier les variables liées à la difficulté perçue, comme les stratégies de coping, le sentiment d’efficacité personnel en gestion de classe et certaines variables sociodémographiques (sexe, formation initiale, formation continue, années d’expérience et contexte institutionnel). Nous avons mené une recherche quantitative de nature hypothéticodéductive. Les données ont été récoltées auprès de vingt-neuf enseignants spécialisés par le biais d’un questionnaire constitué de différentes échelles. Afin de répondre à nos questions de recherche, nous avons réalisé une analyse descriptive corrélationnelle des données. De manière générale, les enseignants spécialisés consultés perçoivent une difficulté moyenne en ce qui concerne la gestion des comportements inadéquats. Leur sentiment d’efficacité personnelle en gestion de classe (SEP) se situe à un niveau moyen sur l’échelle employée. Pour gérer les événements stressants, ils mettent en place davantage les stratégies de coping centré sur le problème, à savoir : la résolution de problème, la réévaluation positive et la recherche de soutien social. Plus précisément, la recherche de soutien social est la seule dimension liée significativement à la difficulté perçue globale. Toutefois, nous constatons des liens significatifs entre les dimensions de l’échelle des comportements inadéquats et certaines dimensions de l’échelle de sentiment d’efficacité, de l’échelle des stratégies d’adaptation ainsi qu’avec certaines variables sociodémographiques. Enfin, nos résultats nous permettent d’apporter quelques recommandations pour les institutions spécialisées afin de soutenir les enseignants spécialisés dans la prise en charge d’enfants présentant des difficultés comportementales.
Simplicial Homology of Random Configurations
Creators: name: Decreusefond, Laurent
name: Ferraz, Eduardo
name: Randriam, Hugues
name: Vergne, Anaïs
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Networking and Internet Architecture (cs.NI)
subject: Algebraic Topology (math.AT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Given a Poisson process on a $d$-dimensional torus, its random geometric simplicial complex is the complex whose vertices are the points of the Poisson process and simplices are given by the uCech complex associated to the coverage of each point. By means of Malliavin calculus, we compute explicitly the n$th$ order moment of the number of $k$-simplices. The two first order moments of this quantity allow us to find the mean and the variance of the Euler caracteristic. Also, we show that the number of any connected geometric simplicial complex converges to the Gaussian law when the intensity of the Poisson point process tends to infinity. We use a concentration inequality to find bounds for the for the distribution of the Betti number of first order and the Euler characteristic in such simplicial complex.
Shot Noise Induced by Nonequilibrium Spin Accumulation
Creators: name: Arakawa, Tomonori
name: Shiogai, Junichi
name: Ciorga, Mariusz
name: Utz, Martin
name: Schuh, Dieter
name: Kohda, Makoto
name: Nitta, Junsaku
name: Bougeard, Dominique
name: Weiss, Dieter
name: Ono, Teruo
name: Kobayashi, Kensuke
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik
subject: 72.25.Dc, 72.15.Lh, 72.25.Hg, 73.40.Ty

description: When an electric current passes across a potential barrier, the partition process of electrons at the barrier gives rise to the shot noise, reflecting the discrete nature of the electric charge. Here we report the observation of excess shot noise connected with a spin current which is induced by a nonequilibrium spin accumulation in an all-semiconductor lateral spin-valve device. We find that this excess shot noise is proportional to the spin current. Additionally, we determine quantitatively the spin-injection-induced electron temperature by measuring the current noise. Our experiments show that spin accumulation driven shot noise provides a novel means of investigating nonequilibrium spin transport.
From Causal Models To Counterfactual Structures
Creators: name: Halpern, Joseph Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.4

description: Galles and Pearl claimed that "for recursive models, the causal model framework does not add any restrictions to counterfactuals, beyond those imposed by Lewis's [possible-worlds] framework." This claim is examined carefully, with the goal of clarifying the exact relationship between causal models and Lewis's framework. Recursive models are shown to correspond precisely to a subclass of (possible-world) counterfactual structures. On the other hand, a slight generalization of recursive models, models where all equations have unique solutions, is shown to be incomparable in expressive power to counterfactual structures, despite the fact that the Galles and Pearl arguments should apply to them as well. The problem with the Galles and Pearl argument is identified: an axiom that they viewed as irrelevant, because it involved disjunction (which was not in their language), is not irrelevant at all.
description: A preliminary version of this paper appears in the Proceedings of the Twelfth International Conference on Principles of Knowledge Representation and Reasoning (KR 2010), 2010.}
On quantum mechanics with a magnetic field on R^n and on a torus T^n, and their relation
Creators: name: Fiore, Gaetano
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 55R10, 55R91, 81S10, 53D50

description: We show in elementary terms the equivalence in a general gauge of a U(1)-gauge theory of a scalar charged particle on a torus T^n = R^n/L to the analogous theory on R^n constrained by quasiperiodicity under translations in the lattice L. The latter theory provides a global description of the former: the quasiperiodic wavefunctions defined on R^n play the role of sections of the associated hermitean line bundle E on T^n, since also E admits a global description as a quotient. The components of the covariant derivatives corresponding to a constant (necessarily integral) magnetic field B = dA generate a Lie algebra g_Q and together with the periodic functions the algebra of observables O_Q . The non-abelian part of g_Q is a Heisenberg Lie algebra with the electric charge operator Q as the central generator; the corresponding Lie group G_Q acts on the Hilbert space as the translation group up to phase factors. Also the space of sections of E is mapped into itself by g in G_Q . We identify the socalled magnetic translation group as a subgroup of the observables' group Y_Q . We determine the unitary irreducible representations of O_Q, Y_Q corresponding to integer charges and for each of them an associated orthonormal basis explicitly in configuration space. We also clarify how in the n = 2m case a holomorphic structure and Theta functions arise on the associated complex torus. These results apply equally well to the physics of charged scalar particles on R^n and on T^n in the presence of periodic magnetic field B and scalar potential. They are also necessary preliminary steps for the application to these theories of the deformation procedure induced by Drinfel'd twists.
description: Latex2e file, 22 pages. Final version appeared in IJTP
Spin thermoelectrics in a disordered Fermi gas
Creators: name: Borge, Juan
name: Gorini, Cosimo
name: Raimondi, Roberto
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: We study the connection between the spin-heat and spin-charge response in a disordered Fermi gas with spin-orbit coupling. It is shown that the ratio between the above responses can be expressed as the thermopower S=−(πkB)2Tσ′/3eσ times a number Rs which depends on the strength and type of the spin-orbit couplings considered. The general results are illustrated by examining different two-dimensional electron or hole systems with different and competing spin-orbit mechanisms, and we conclude that a metallic system could prove much more efficient as a heat-to-spin than as a heat-to-charge converter.
On Method in the Humanities
Creators: name: Wythoff, Grant R.
Publisher: name: Columbia University
Year: 2016
Subjects: subject: Humanities--Research--Methodology
subject: Sociology
subject: FOS: Sociology

description: Presentation on Bruno Latour, Northrop Frye, Marshall McLuhan, Robert Fogel, and the history of "method" in the humanities. Given at the 2016 Society for Literature, Science, and the Arts (SLSA) Annual Meeting in Atlanta. Part of a panel stream that explored lab culture in the arts and humanities: "Practitioners from a variety of laboratories will discuss the politics of creating and maintaining an arts/humanities laboratory. They will also discuss recent research emerging from their labs. This specific panel focuses on bioart, health studies, and interdisciplinary research."
The Justices Have No Robes: An Ethnography of the United States Supreme Court’s Court Watchers
Creators: name: Selbrede, Anna
Publisher: name: University of Chicago
Year: 2022

description: The United States Supreme Court’s legitimacy depends upon maintaining a black box around its decisions, distancing itself from the public to prove its independence. Experts fill this gap, traditionally translating Court happenings for the public in a reverent manner that reinforces its image. However, a new group of legal journalists, professors, and practitioners on Twitter upends these norms. I conduct a virtual ethnography of this new legal community which I call the “court watchers.” After 6 months of Twitter monitoring and 11 interviews, I find that court watchers reframe the legitimacy of the Court through their discourse, uncovering that the justices “have no robes.” Expertise and irreverence combine to allow watchers to push past traditional deference and acknowledge an unspoken understanding of the Court’s processes. By refusing to support the pretense that the Court is separate from politics, watchers can advocate for procedural reforms to create a truly legitimate court.