cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gradual extinction reduces reinstatement
Creators: name: Shiban, Youssef
name: Wittmann, Jasmin
name: Weißinger, Mara
name: Mühlberger, Andreas
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: gradual extinction, virtual reality, pavlovian fear conditioning, skin conductance response, startle response, contingency ratings
subject: 150 Psychologie

description: The current study investigated whether gradually reducing the frequency of aversive stimuli during extinction can prevent the return of fear. Thirty-one participants of a three-stage procedure (acquisition, extinction and a reinstatement test on day 2) were randomly assigned to a standard extinction (SE) and gradual extinction (GE) procedure. The two groups differed only in the extinction procedure. While the SE group ran through a regular extinction process without any negative events, the frequency of the aversive stimuli during the extinction phase was gradually reduced for the GE group. The unconditioned stimulus (US) was an air blast (5 bar, 10 ms). A spider and a scorpion were used as conditioned stimuli (CS). The outcome variables were contingency ratings and physiological measures (skin conductance response, SCR and startle response). There were no differences found between the two groups for the acquisition and extinction phases concerning contingency ratings, SCR, or startle response. GE compared to SE significantly reduced the return of fear in the reinstatement test for the startle response but not for SCR or contingency ratings. This study was successful in translating the findings in rodent to humans. The results suggest that the GE process is suitable for increasing the efficacy of fear extinction.
Kochen-Specker Sets and Generalized Orthoarguesian Equations
Creators: name: Megill, Norman D.
name: Pavicic, Mladen
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Every set (finite or infinite) of quantum vectors (states) satisfies generalized orthoarguesian equations ($n$OA). We consider two 3-dim Kochen-Specker (KS) sets of vectors and show how each of them should be represented by means of a Hasse diagram---a lattice, an algebra of subspaces of a Hilbert space--that contains rays and planes determined by the vectors so as to satisfy $n$OA. That also shows why they cannot be represented by a special kind of Hasse diagram called a Greechie diagram, as has been erroneously done in the literature. One of the KS sets (Peres') is an example of a lattice in which 6OA pass and 7OA fails, and that closes an open question of whether the 7oa class of lattices properly contains the 6oa class. This result is important because it provides additional evidence that our previously given proof of noa =< (n+1)oa can be extended to proper inclusion noa < (n+1)oa and that nOA form an infinite sequence of successively stronger equations.
description: 16 pages and 5 figures
Complex scattering as canonical transformation: A semiclassical approach in Fock space
Creators: name: Engl, Thomas
name: Urbina, Juan Diego
name: Hummel, Quirin
name: Richter, Klaus
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Boson sampling;semiclassical approximations;canonical transformations;many-body scattering;non-interacting quantum fields
subject: 530 Physik

description: We show that a theory of com plex scattering between many-body (Fock) states can be constructed such that its classical limit is a canonical transformation thus encoding quantum interference in the semiclassical form of the associated unitary operator. Based on this idea, we study the different coherent effects expected under different choices of the many-body states and provide different representations of the associated transition probabilities. In this way, we derive exact relations and representations of the scattering process that can be used to attack timely problems related with Boson Sampling.
On reduced Beltrami equations and linear families of quasiregular mappings
Creators: name: Jääskeläinen, Jarmo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Complex Variables (math.CV)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 30C62 (Primary) 35J15 (Secondary)

description: This paper studies linear classes of planar quasiregular mappings. We give a positive answer to a conjecture of K. Astala, T. Iwaniec, and G. Martin (2009) on reduced Beltrami equations. Moreover, we use it to prove a Wronsky-type theorem for general linear Beltrami systems. This is a key to show that the associated Beltrami equation of a linear quasiregular family is unique.
description: 17 pages, Theorem 1.3 extended and the text flow improved
Analysing the Contribution of Coupling Metrics for the Development and Management of Process Architectures
Creators: name: Braunnagel, Daniel
name: Johannsen, Florian
name: Leist, Susanne
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Process architecture, Process modeling, Coupling
subject: 004 Informatik

description: Currently, the development and modeling of enterprise architectures is an intensively discussed topic in both science and practice. Process architectures represent a core element in recent enterprise architecture frameworks. With process models being a central means for communicating and documenting the process architectures, both their quality and understandability are decisive. However, the concept of process model quality is still not fully understood. The recent development has highlighted the role of coupling in models. Coupling is expected to represent an important dimension of quality for conceptual models. Still, this perspective is hardly understood and its definition vague. Therefore, this work collects diverse coupling interpretations in the field of process modelling and integrates them to a common and precise definition. Once introduced and formally specified, the metrics serve as a basis for a discussion on coupling and on how the future development in respect to coupling could look like. The main findings are that currently metrics evaluate either the documentation of the process architecture regarding its understandability or they contribute to the individual applications of process architectures. These findings support practitioners selecting metrics for a particular task and scientists to identify research gaps for further development.
Boys' Love (Danmei) fiction on the Chinese internet : Wasabi Kun, the BL forum Young Nobleman Changpei, and the development of an online literary phenomenon
Creators: name: Chen, Xin
Publisher: name: University of British Columbia
Year: 2017

description: This study is a brief history of the development of danmei 耽美, or Boys’ Love (BL) fiction on mainland Chinese websites. Focusing on Gongzi Changpei 公子长佩 (Young Nobleman Changpei) – a danmei forum –and writings by the danmei author Wasabi Kun 芥末君, it conducts a case study of danmei as a literary phenomenon, encompassing factors such as industry, aesthetics, and community, including reader response. In sketching the ecology of one type of online literature, this study draws on primary literary texts, online reader responses by so-called fu nü 腐女 (“rotten girls”), industry data, and previous scholarly studies. Appendices include a glossary of terms and two non-exhaustive tables: one details the main websites/forums where the writing, reading, discussion, and circulation of danmei fiction takes place; the other lists representative novels from 2001 to 2015. Chapter 2 offers an introduction to the Chinese BL forum Gongzi Changpei (Young Nobleman Changpei), detailing the subgenres on offer, analyzing a selection of popular novels, and describing the forums’ operations. Chapter 3 offers a detailed analysis of the career and reception of author Wasabi Kun 芥末君, as well as of Kun’s serialized novel If You Have Been Through Winter 如你走过冬天 (2015-2016). Through analyzing Kun’s work, I show a line of development in the genre. I argue that Kun tries to avoid creating simply a hybrid combination of various genre elements or a series of utopian but improbable cute stories. Instead, Kun’s novel emphasizes romance and individual growth, refined language and emotional realism. In tracing a broader history of the genre, I argue that danmei fiction is being influenced by Japanese and Western models at a time when Chinese women are pursuing non-traditional gender roles and becoming comfortable discussing and reading about sex. Yet after a dozen years of development, the mainstream of online writing shows that even as the novels become more entertaining, fewer focus solely on homosexual relationships. More authors are writing novels with hybrid genre elements, in which the familiar Boys’ Love tropes of sex and pleasure are becoming more or less sidelined.
title: "Gruppo di Leda con cigno", arte romana, inv. CVIIC (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
Two-loop evolution equations for light-ray operators
Creators: name: Braun, Vladimir M.
name: Manashov, Alexander
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: CD in non-integer d=4-2 epsilon space-time dimensions possesses a nontrivial critical point and enjoys exact scale and conformal invariance. This symmetry imposes nontrivial restrictions on the form of the renormalization group equations for composite operators in physical (integer) dimensions and allows to reconstruct full kernels from their eigenvalues (anomalous dimensions). We use this technique to derive two-loop evolution equations for flavor-nonsinglet quark-antiquark light-ray operators that encode the scale dependence of generalized hadron parton distributions and light-cone distribution amplitudes in the most compact form.
description: SCOAP3
In silico identification of small molecule protein-protein interaction inhibitors: targeting hotspot regions at the interface of MXRA8 and CHIKV envelope protein
Creators: name: Verma, Jyoti
name: Subbarao, Naidu
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology

description: Chikungunya virus (CHIKV) is an arthritogenic arbovirus responsible for re-emerging epidemics of Chikungunya fever around the world for centuries. Chikungunya has become endemic in Africa, Southeast Asia, the Indian subcontinent, and subtropical regions of the Americas. The unavailability of antiviral therapy or vaccine against the CHIKV and its continuous re-emergence demands an urgent need to develop potential candidate therapeutics. CHIKV entry into the host cell is mediated by its envelope proteins engaging the cellular receptor MXRA8 to invade the susceptible cells. We report here two essential target binding sites at the CHIKV E1-E2 proteins by identifying hotspot regions at the E1-E2-MXRA8 binding interface. Further, we employed high throughput computational screening to identify potential small molecule protein-protein interaction (PPI) modulators which could effectively bind at the identified target sites. Molecular dynamics simulations and binding free energy calculations confirmed the stability of three compounds, viz., ZINC299817498, ZINC584908978, and LAS52155651, at both the predicted interface binding sites. The polar and charged residues at the interface were responsible for energetically holding the ligands at the binding sites. Altogether, our findings suggest that the predicted target binding sites at the E1-E2 dimer could be essential to block the receptor interaction as well as the fusion process of the CHIKV particles. Thus, we identified a few small molecule PPI inhibitors with great potential to block the E1-E2-MXRA8 interaction and act as promising templates to design anti-CHIKV drugs. Communicated by Ramaswamy H. Sarma
Le transfert culturel chez Ousmane Sembène : du péritexte auctorial au péritexte traduit
Creators: name: Schiavone, Cristina
Publisher: name: Fondazione Università Ca’ Foscari Venezia, Italia
Year: 2020

description:

The aim of the contribution is to show, through examples taken from the analysis of paratextual elements, the liminal space lying outside the fiction, how the cultural diversity, of which Ousmane Sembène’s opus is the expression, is treated first by the author and in a second step by the Italian translator, mediating the intercultural dialogue. This research also provides a few useful suggestions for a ‘good’ translation of sub-saharian Francophone literatures.

description: Il Tolomeo
On the rate of convergence in the martingale central limit theorem
Creators: name: Mourrat, Jean-Christophe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Consider a discrete-time martingale, and let $V^2$ be its normalized quadratic variation. As $V^2$ approaches 1, and provided that some Lindeberg condition is satisfied, the distribution of the rescaled martingale approaches the Gaussian distribution. For any $p\geq 1$, (Ann. Probab. 16 (1988) 275-299) gave a bound on the rate of convergence in this central limit theorem that is the sum of two terms, say $A_p+B_p$, where up to a constant, $A_p={\|V^2-1\|}_p^{p/(2p+1)}$. Here we discuss the optimality of this term, focusing on the restricted class of martingales with bounded increments. In this context, (Ann. Probab. 10 (1982) 672-688) sketched a strategy to prove optimality for $p=1$. Here we extend this strategy to any $p\geq 1$, thereby justifying the optimality of the term $A_p$. As a necessary step, we also provide a new bound on the rate of convergence in the central limit theorem for martingales with bounded increments that improves on the term $B_p$, generalizing another result of (Ann. Probab. 10 (1982) 672-688).
description: Published in at http://dx.doi.org/10.3150/12-BEJ417 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Exploring electronic, structural and dynamics parameters of phenylbenzothiazole complexes with Mn2+, Cu2+ and Zn2+ for designing new magnetic resonance imaging (MRI) probes: congruence between computation and spectroscopic data
Creators: name: Rosa, Isael Aparecido
name: Gonçalves, Mateus A.
name: Krambrock, Klaus Wilhelm Heinrich
name: dos Santos, Marcelo Henrique
name: Braga, Letícia S.
name: da Cunha, Elaine F. F.
name: Ramalho, Teodorico C.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Medicine
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: Cancer is one of the leading causes of human death worldwide, being one of the most serious problems faced by mankind. For the diagnosis, Magnetic Resonance Imaging (MRI), through effective contrast agents (Cas), has greatly helped in the diagnosis at the initial stages. However, it is necessary to include new compounds more effective and selective for cancer diagnosis. The complexes with Mn2+, Cu2+ and Zn2+ have received great attention due to their applications as CAs for MRI. Those materials can shorten the T2 and T2* transverse relaxation times. Thus, the representative structures for hyperfine coupling constants (HFCCs) were selected from docking results by frequency of occupancy calculations. From the Multivariate Analysis to obtain the PCA graphs in the choice of a representative conformations. it is possible to notice that the variable energy does not present a high correlation with the other variables, and structural factors, such as the spatial positions of the metal atoms, seem to be important in the reactivity of the complexes. Structural factors, such as the spatial positions of the metal atoms, seem to be important in the reactivity of the complexes. Theoretical findings suggest that the compounds are capable of increasing the Aiso values of the water molecules, but the complex [Zn(H2O)(NNO)] shows a greater influence, being more sensitive to the Electron paramagnetic resonance parameters than the complexes [CuCl(H2O)NNO] and [MnCl2(H2O)(NNO)] with the explicit solvent and the enzyme. MRI contrast agents have generated various problems due to their high toxicity. In this perspective, this compound may be a promising alternative for transporting the CAs into diseased tissue. Communicated by Ramaswamy H. Sarma
Inferring the Sign of Kinase-Substrate Interactions by Combining Quantitative Phosphoproteomics with a Literature-Based Mammalian Kinome Network
Creators: name: Hernandez, Marylens
name: Lachmann, Alexander
name: Zhao, Shan
name: Xiao, Kunhong
name: Ma'ayan, Avi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: Protein phosphorylation is a reversible post-translational modification commonly used by cell signaling networks to transmit information about the extracellular environment into intracellular organelles for the regulation of the activity and sorting of proteins within the cell. For this study we reconstructed a literature-based mammalian kinase-substrate network from several online resources. The interactions within this directed graph network connect kinases to their substrates, through specific phosphosites including kinase-kinase regulatory interactions. However, the "signs" of links, activation or inhibition of the substrate upon phosphorylation, within this network are mostly unknown. Here we show how we can infer the "signs" indirectly using data from quantitative phosphoproteomics experiments applied to mammalian cells combined with the literature-based kinase-substrate network. Our inference method was able to predict the sign for 321 links and 153 phosphosites on 120 kinases, resulting in signed and directed subnetwork of mammalian kinase-kinase interactions. Such an approach can rapidly advance the reconstruction of cell signaling pathways and networks regulating mammalian cells.
description: 5 page, 3 figures, IEEE-BIBE confrence
Nanoparticles with photoinduced precipitation for the extraction of pollutants from water and soil
Creators: name: Brandl, Ferdinand
name: Bertrand, Nicolas
name: Lima, Eliana Martins
name: Langer, Robert
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 540 Chemie

description: Nanotechnology may offer fast and effective solutions for environmental clean-up. Herein, amphiphilic diblock copolymers are used to develop a platform of photosensitive core-shell nanoparticles. Irradiation with ultraviolet light removes the protective layer responsible for colloidal stability; as a result, the nanoparticles are rapidly and irreversibly converted to macroscopic aggregates. The associated phase separation allows measuring the partitioning of small molecules between the aqueous phase and nanoparticles; data suggests that interactions are enhanced by decreasing the particle size. Adsorption onto nanoparticles can be exploited to efficiently remove hydrophobic pollutants from water and contaminated soil. Preliminary in vivo experiments suggest that treatment with photocleavable nanoparticles can significantly reduce the teratogenicity of bisphenol A, triclosan and 17[alpha]-ethinyl estradiol without generating obviously toxic byproducts. Small-scale pilot experiments on wastewater, thermal printing paper and contaminated soil demonstrate the applicability of the approach.
Near-Optimal and Explicit Bell Inequality Violations
Creators: name: Buhrman, Harry
name: Regev, Oded
name: Scarpa, Giannicola
name: de Wolf, Ronald
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: J.2
subject: 81P65

description: Entangled quantum systems can exhibit correlations that cannot be simulated classically. For historical reasons such correlations are called "Bell inequality violations." We give two new two-player games with Bell inequality violations that are stronger, fully explicit, and arguably simpler than earlier work. The first game is based on the Hidden Matching problem of quantum communication complexity, introduced by Bar-Yossef, Jayram, and Kerenidis. This game can be won with probability 1 by a strategy using a maximally entangled state with local dimension $n$ (e.g., $\log n$ EPR-pairs), while we show that the winning probability of any classical strategy differs from ${1}/{2}$ by at most $O((\log n)/\sqrt{n})$. The second game is based on the integrality gap for Unique Games by Khot and Vishnoi and the quantum rounding procedure of Kempe, Regev, and Toner. Here $n$-dimensional entanglement allows the game to be won with probability $1/(\log n)^2$, while the best winning probability without entanglement is $1/n$. This near-linear ratio is almost optimal, both in terms of the local dimension of the entangled state, and in terms of the number of possible outputs of the two players.
description: Published in Theory of Computing, Volume 8 (2012), Article 27; Received: September 15, 2011, Revised: August 31, 2012, Published: December 27, 2012
A Note on Extrema of Linear Combinations of Elementary Symmetric Functions
Creators: name: Kovačec, Alexander
name: Kuhlmann, Salma
name: Riener, Cordian
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 13J30 (Primary), 26D05 (Secondary)

description: This note provides a new approach to a result of Foregger and related earlier results by Keilson and Eberlein. Using quite different techniques, we prove a more general result from which the others follow easily. Finally, we argue that the proof given by Foregger is flawed.
description: (v2) revision based on suggestions by referee
Towards a fitting procedure to deeply virtual meson production - the next-to-leading order case
Creators: name: Müller, D.
name: Lautenschlager, Tobias
name: Passek-Kumerički, K.
name: Schäfer, Andreas
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: Based on the collinear factorization approach, we present a comprehensive perturbative next-to-leading (NLO) analysis of deeply virtual meson production (DVMP). Our representation in conformal Mellin space can serve as basis for a global fitting procedure to access generalized parton distributions from experimental measurements of DVMP and deeply virtual Compton scattering (DVCS). We introduce a rather general formalism for the evaluation of conformal moments that can be developed further beyond the considered order. We also confirm previous diagrammatical findings in the pure singlet quark channel. Finally, we use the analytic properties of the hard scattering amplitudes to estimate qualitatively the size of radiative corrections and illustrate these considerations with some numerical examples. The results suggest that global NLO GPD fits, including both DVMP and DVCS data, could be more stable than often feared.
description: SCOAP3
Feedback Control of Quantum Transport
Creators: name: Brandes, Tobias
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The current through nanostructures like quantum dots can be stabilized by a feedback loop that continuously adjusts system parameters as a function of the number of tunnelled particles $n$. At large times, the feedback loop freezes the fluctuations of $n$ which leads to highly accurate, continuous single particle transfers. For the simplest case of feedback acting simultaneously on all system parameters, we show how to reconstruct the original full counting statistics from the frozen distribution.
description: 4 pages, 2 figures
Exploring species-specific inhibitors with multiple target sites on S. aureus pyruvate kinase using a computational workflow
Creators: name: Yuce, Merve
name: Sarica, Zehra
name: Ates, Beril
name: Kurkcuoglu, Ozge
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Pharmacology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Hematology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Experimental evidence indicated that bacterial pyruvate kinase of glycolysis can be evaluated as an alternative target to eliminate infections, while antibiotic resistance poses a global threat. Here, we use a computational workflow to reveal and investigate the potential allosteric sites of methicillin-resistant S. aureus PK, which can help in designing species-specific drugs to inhibit activity of this organism. Residue interaction networks point to a known allosteric site at the small C-C interface, a potential allosteric site near the small interface (site #1), and a second potential allosteric site at the large interface (site #2). 2 µs-long molecular dynamics (MD) simulations with AMBER16 generate different conformations of one narrow target site. Known and potential allosteric sites on the selected conformers are investigated using ensemble docking with AutoDock Vina and a library of 2447 FDA-approved drugs. We determine 18 hits, comprising ergot-alkaloids, anti-cancer-agents, antivirals, analgesics, cardiac glycosides, all with a high docking z-score for three sites. 5 selected compounds with high, average and low z-scores are subjected to 50 ns-long MD simulations for MM-GBSA calculations. ΔGbind values up to −49.3 kcal/mol at the C-C interface, up to −32.7 kcal/mol at site #1, and up to −53.3 kcal/mol at site #2 support the docking calculations. We investigate mitapivat and TT-232 as reference compounds under clinical trial, targeting human PK isomers. We suggest 18 FDA-approved hits from the docking calculations and TT-232 as potential inhibitors with multiple target sites on S. aureus PK. This study also proposes pharmacophores models for de novo drug design. Communicated by Ramaswamy H. Sarma
Synthesis and electronic properties of π-extended flavins
Creators: name: Mataranga-Popa, L. N.
name: Torje, I.
name: Ghosh, Tamal
name: Leitl, Markus J.
name: Späth, Andreas
name: Novianti, M. L.
name: Webster, R. D.
name: König, Burkhard
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 540 Chemie

description: Flavin derivatives with an extended π-conjugation were synthesized in moderate to good yields from aryl bromides via a Buchwald–Hartwig palladium catalyzed amination protocol, followed by condensation of the corresponding aromatic amines with violuric acid. The electronic properties of the new compounds were investigated by absorption and emission spectroscopy, cyclic voltammetry, density functional theory (DFT) and time dependent density functional theory (TDDFT). The compounds absorb up to 550 nm and show strong luminescence. The photoluminescence quantum yields ϕPL measured in dichloromethane reach 80% and in PMMA (poly(methyl methacrylate)) 77%, respectively, at ambient temperature. The electrochemical redox behaviour of π-extended flavins follows the mechanism previously described for the parent flavin.
description: Open Access Komponente aus der Allianzlizenz
Nonlinear Terahertz Emission in Semiconductor Microcavities
Creators: name: Savenko, I. G.
name: Shelykh, I. A.
name: Kaliteevski, M. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We consider the nonlinear terahertz emission by the system of cavity polaritons in the regime of polariton lasing. To account for the quantum nature of terahertz-polariton coupling we use the Lindblad master equation approach and demonstrate that quantum microcavities reveal rich variety of the nonlinear phenomena in terahertz range, including bistability, short THz pulse generation and THz switching.
description: 4 pages + 5 figures + Supplementary Material. (Final version containing the derivation of the kinetic equations.)
Real-time Observation of interfering Crystal electroncs in high-harmonic Generation
Creators: name: Hohenleutner, Matthias
name: Langer, Fabian
name: Schubert, Olaf
name: Knorr, Matthias
name: Huttner, U.
name: Koch, S. W.
name: Kira, M.
name: Huber, Rupert
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: Acceleration and collision of particles has been a key strategy for exploring the texture of matter. Strong light waves can control and recollide electronic wavepackets, generating high-harmonic radiation that encodes the structure and dynamics of atoms and molecules and lays the foundations of attosecond science1, 2, 3. The recent discovery of high-harmonic generation in bulk solids4, 5, 6 combines the idea of ultrafast acceleration with complex condensed matter systems, and provides hope for compact solid-state attosecond sources6, 7, 8 and electronics at optical frequencies3, 5, 9, 10. Yet the underlying quantum motion has not so far been observable in real time. Here we study high-harmonic generation in a bulk solid directly in the time domain, and reveal a new kind of strong-field excitation in the crystal. Unlike established atomic sources1, 2, 3, 9, 11, our solid emits high-harmonic radiation as a sequence of subcycle bursts that coincide temporally with the field crests of one polarity of the driving terahertz waveform. We show that these features are characteristic of a non-perturbative quantum interference process that involves electrons from multiple valence bands. These results identify key mechanisms for future solid-state attosecond sources and next-generation light-wave electronics. The new quantum interference process justifies the hope for all-optical band-structure reconstruction and lays the foundation for possible quantum logic operations at optical clock rates.
Absorption Spectroscopic Determination of Solubility of Alloxazine in Aqueous Solutions
Creators: name: Penzkofer, Alfons
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Solubility Limit Concentration, Alloxazine, Isoalloxazine, Absorption Method, Aqueous Solutions
subject: 530 Physik

description: The solubility of alloxazine in aqueous solution at pH 4 (10–4 molar HCl) and pH 10 (10–4 molar NaOH) at room temperature is determined by absorption spectroscopic characterization. Knowledge of the solubility is needed for sample preparation and quantitative spectroscopic solution characterization. Samples of different in-weight concentration were prepared and absorption spectra were measured versus storage time. The solubility limit concentration Csol was determined by the crossing point of the linearized absorption coefficient dependences on in-weight preparation concentration below and above the solubility limit. Values of Csol= 9.05 ± 1 μM and 14.5 ± 1 μM were determined for alloxazine in aqueous solution at pH 4 and pH 10, respectively.
Supporting the implementation of effective urban water conservation and demand management strategies
Creators: name: Klein, Daniel Richard
Publisher: name: University of British Columbia
Year: 2017

description: There is an urgent need to ensure the sustainability of urban water resources. In the face of growing challenges including urbanization, climate change, and increased competition for available resources, new and innovative water management strategies are required. The conventional approach to sustainable urban water management typically focusses on the supply dimension; however, this has proven to be largely inadequate and many are calling for a new approach to addressing this issue. The aim of this thesis is to examine how the water meter data management and analysis systems might be improved to better support water conservation efforts by exploring the literature and carrying out a case study of the City of Vancouver. Literature covering the field of urban water demand modeling as well as conservation interventions and their use in reducing potable water demand were reviewed within the context of the changing understanding of urban water resource sustainability and its dimensions. A case study of the City of Vancouver parks system then explored how existing water meter data could be leveraged to support conservation efforts. The results found that while there have been substantial efforts undertaken to characterize and understand the factors that influence water demand, behaviour and social factors remain largely unaccounted for which are vital dimensions to include in the development of solutions. The case study findings demonstrated that the analysis of existing data can be successful in understanding conservation strategy options, which can be a useful entry point in addressing this highly complex problem. Across the literature and case study the findings highlight the gap in knowledge around water use and behaviour that is evident when the focus is on sustainability. Future work is recommended to incorporate a wide range of influencing factors that go beyond the conventional supply oriented paradigm.
Source-Channel Coding Theorems for the Multiple-Access Relay Channel
Creators: name: Murin, Yonathan
name: Dabora, Ron
name: Gündüz, Deniz
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We study reliable transmission of arbitrarily correlated sources over multiple-access relay channels (MARCs) and multiple-access broadcast relay channels (MABRCs). In MARCs only the destination is interested in reconstructing the sources, while in MABRCs both the relay and the destination want to reconstruct them. In addition to arbitrary correlation among the source signals at the users, both the relay and the destination have side information correlated with the source signals. Our objective is to determine whether a given pair of sources can be losslessly transmitted to the destination for a given number of channel symbols per source sample, defined as the source-channel rate. Sufficient conditions for reliable communication based on operational separation, as well as necessary conditions on the achievable source-channel rates are characterized. Since operational separation is generally not optimal for MARCs and MABRCs, sufficient conditions for reliable communication using joint source-channel coding schemes based on a combination of the correlation preserving mapping technique with Slepian-Wolf source coding are also derived. For correlated sources transmitted over fading Gaussian MARCs and MABRCs, we present conditions under which separation (i.e., separate and stand-alone source and channel codes) is optimal. This is the first time optimality of separation is proved for MARCs and MABRCs.
description: Accepted to IEEE Transaction on Information Theory
Calibrations in hyperkahler geometry
Creators: name: Grantcharov, Gueo
name: Verbitsky, Misha
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We describe a family of calibrations arising naturally on a hyperkähler manifold $M$. These calibrations calibrate the holomorphic Lagrangian, holomorphic isotropic and holomorphic coisotropic subvarieties. When $M$ is an HKT (hyperkaehler with torsion) manifold with holonomy $SL(n, {\Bbb H})$, we construct another family of calibrations $Φ_i$, which calibrates holomorphic Lagrangian and holomorphic coisotropic subvarieties. The calibrations $Φ_i$ are (generally speaking) not parallel with respect to any torsion-free connection on $M$.
description: v. 3.1, 33 pages, minor corrections, final version (accepted by Commun. Contemp. Math.)
Living in isolation - population structure, reproduction and genetic variation of the endangered plant species Dianthus gratianopolitanus (Cheddar pink)
Creators: name: Reisch, Christoph
name: Putz, Christina M.
name: Schmid, Christoph
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Amplified fragment length polymorphisms;Dianthus gratianopolitanus;distribution range;genetic variation;isolation;population structure;rarity;reproductive traits
subject: 580 Pflanzen (Botanik)

description: The endangered plant species Dianthus gratianopolitanus exhibits a highly fragmented distribution range comprising many isolated populations. Based upon this pattern of distribution, we selected a study region in Switzerland with a lower magnitude of isolation (Swiss Jura) and another study region in Germany with a higher degree of isolation (Franconian Jura). In each region, we chose ten populations to analyze population structure, reproduction, and genetic variation in a comparative approach. Therefore, we determined population density, cushion size, and cushion density to analyze population structure, investigated reproductive traits, including number of flowers, capsules, and germination rate, and analyzed amplified fragment length polymorphisms to study genetic variation. Population and cushion density were credibly higher in German than in Swiss populations, whereas reproductive traits and genetic variation within populations were similar in both study regions. However, genetic variation among populations and isolation by distance were stronger in Germany than in Switzerland. Generally, cushion size and density as well as flower and capsule production increased with population size and density, whereas genetic variation decreased with population density. In contrast to our assumptions, we observed denser populations and cushions in the region with the higher magnitude of isolation, whereas reproductive traits and genetic variation within populations were comparable in both regions. This corroborates the assumption that stronger isolation must not necessarily result in the loss of fitness and genetic variation. Furthermore, it supports our conclusion that the protection of strongly isolated populations contributes essentially to the conservation of a species' full evolutionary potential.
Geometric structures associated with a simple Cartan 3-form
Creators: name: Van Le, Hong
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C10, 53C2, 53C38

description: We introduce the notion of a manifold admitting a simple compact Cartan 3-form $\om^3$. We study algebraic types of such manifolds specializing on those having skew-symmetric torsion, or those associated with a closed or coclosed 3-form $\om^3$. We prove the existence of an algebra of multi-symplectic forms $ϕ^l$ on these manifolds. Cohomology groups associated with complexes of differential forms on $M^n$ in presence of such a closed multi-symplectic form $ϕ^l$ and their relations with the de Rham cohomologies of $M$ are investigated. We show rigidity of a class of strongly associative (resp. strongly coassociative) submanifolds. We include an appendix describing all connected simply connected complete Riemannian manifolds admitting a parallel 3-form.
description: 32 pages, final version, previous wrong Example 3.5 is removed
Recent applications of the hetero Diels-Alder reaction in the total synthesis of natural products
Creators: name: Mommahed Heravi, Majid
name: Ahmadi, Tahereh
name: Ghavidel, Mahdieh
name: Heidari, Bahareh
name: Hamidi, Hoda
Publisher: name: figshare
Year: 2022
Subjects: subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: FOS: Chemical sciences
subject: 30502 Natural Products Chemistry
subject: 30701 Quantum Chemistry
subject: 39904 Organometallic Chemistry
subject: Organic Chemistry
subject: 30599 Organic Chemistry not elsewhere classified
subject: 30205 Non-metal Chemistry
subject: Nuclear Chemistry
subject: 30504 Organic Green Chemistry
subject: 30303 Optical Properties of Materials

description: The synthetic utility and potential power of the Diels-Alder (D-A) reaction in organic chemistry is evident. These significances have been extended to the synthesis of a plethora and wide variety of heterocyclic compounds via [4 + 2] cycloaddition reactions, the so called hetero Diels-Alder (HDA) reaction. In this work we try to focus on the scope and preparative synthetic applications of the HDA reaction as a key step in the total synthesis of natural products.
Guiding of Electrons in a Few-Mode Ballistic Graphene Channel
Creators: name: Rickhaus, Peter
name: Liu, Ming-Hao
name: Makk, Péter
name: Maurand, Romain
name: Hess, Samuel
name: Zihlmann, Simon
name: Weiss, Markus
name: Richter, Klaus
name: Schönenberger, Christian
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: Suspended graphene; ballistic transport; electron guiding; electron-optics; p-n junction; 1D confinement
subject: 530 Physik

description: In graphene, the extremely fast charge carriers can be controlled by electron-optical elements, such as waveguides, in which the transmissivity is tuned by the wavelength. In this work, charge carriers are guided in a suspended ballistic few-mode graphene channel, defined by electrostatic gating. By depleting the channel, a reduction of mode number and steps in the conductance are observed, until the channel is completely emptied. The measurements are supported by tight-binding transport calculations including the full electrostatics of the sample.
A Normal Form Theorem around Symplectic Leaves
Creators: name: Crainic, Marius
name: Marcut, Ioan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Differential Geometry (math.DG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: We prove the Poisson geometric version of the Local Reeb Stability (from foliation theory) and of the Slice Theorem (from equivariant geometry). The result is also a generalization of Conn's linearization theorem from one-point leaves to arbitrary symplectic leaves (however, we do not make use of Conn's theorem).
description: 32 pages. v3: some proofs were simplified, typos fixed, definitions of well-known notions were left out
The Jet-Driven Outflow in the Radio Galaxy SDSS J1517+3353: Implications for Double-Peaked Narrow-Line AGN
Creators: name: Rosario, D. J.
name: Shields, G. A.
name: Taylor, G. B.
name: Salviander, S.
name: Smith, K. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report on the study of an intriguing active galaxy that was selected as a potential multiple supermassive black hole merger in the early-type host SDSS J151709.20+335324.7 (z=0.135). Ground-based SDSS imaging reveals two blue structures on either side of the photometric center of the host galaxy, separated from each other by about 5.7 kpc. The analysis of spatially resolved emission line profiles from a Keck/HIRES spectrum reveal three distinct kinematic subcomponents, one at rest and the other two moving at -350 km/s and 500 km/s with respect to the systemic velocity of the host galaxy. A comparison of imaging and spectral data confirm a strong association between the kinematic components and the spatial knots, which implies a highly disturbed and complex active region in this object. Subsequent VLA radio imaging reveals a clear jet aligned with the emission line gas, confirming that a jet-gas interaction is the best explanation for emission line region. We use the broadband radio measurements to examine the impact of the jet on the ISM of the host galaxy, and find that the energy in the radio lobes can heat a significant fraction of the gas to the virial temperature. Finally, we discuss tests that may help future surveys distinguish between jet-driven kinematics and true black-hole binaries. SDSS J151709.20+335324.7 is a remarkable laboratory for AGN feedback and warrants deeper follow-up study. In the Appendix, we present high-resolution radio imaging of a second AGN with double-peaked [O III] lines, SDSS J112939.78+605742.6, which shows a sub-arcsecond radio jet. If the double-peaked nature of the narrow lines in radio-loud AGN are generally due to radio jet interactions, we suggest that extended radio structure should be expected in most of such systems.
description: 15 Pages in emulateapj, 10 figs, accepted for publication in ApJ
Does competitive swimming during puberty affect lung development in pubertal females?
Creators: name: Bovard, Joshua Maschio
Publisher: name: University of British Columbia
Year: 2017

description: Whether the large lungs of competitive swimmers result from intensive swim training or genetic endowment has been widely debated. Given that peak growth velocities for the lungs occur during puberty, this longitudinal study aimed to determine if competitive swimming during puberty affected lung development. Female swimmers (n=11) and healthy controls (n=10) aged 11-14 years old were assessed before and after one competitive swimming season. Pulmonary function testing included lung volumes, spirometry, diffusion capacity (DL,CO), and maximal inspiratory (PIMAX) and expiratory (PEMAX) pressures. Ventilatory constraints, including end-expiratory lung volume (EELV), expiratory flow limitation (EFL), and utilization of ventilatory capacity (V̇E/V̇ECAP), were assessed during an incremental cycling test. Despite being of similar age (p=0.10), maturational development (p=0.27), and height (p=0.38) as controls, swimmers had a larger total lung capacity (p<0.01), forced vital capacity (p<0.01), and peak expiratory flow (p=0.03). Although DL,CO was greater in swimmers (p=0.01), there was no difference when expressed relative to alveolar volume (p=0.20). Both PIMAX (p=0.06) and PEMAX (p<0.001) were greater in swimmers. Swimmers and controls achieved a similar relative maximal oxygen consumption (p=0.32) and experienced similar ventilatory constraints as characterized by EELV (p=0.18), severity (p=0.95) and prevalence (p=0.71) of EFL, and V̇E/V̇ECAP (p=0.95). Changes over time were similar between groups (p>0.05). Pubertal female swimmers already had larger lung capacities, higher flows, and greater indices of respiratory muscle strength, but similar ventilatory constraints while cycling. One competitive swimming season did not further accentuate this enhanced function or alter exercise ventilatory mechanics, suggesting that competitive swimming during puberty did not affect lung development.
Dirac equation for embedded 4-geometries
Creators: name: Trzetrzelewski, Maciej
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We apply Dirac's square root idea to constraints for embedded 4-geometries swept by a 3-dimensional membrane. The resulting Dirac-like equation is then analyzed for general coordinates as well as for the case of a Friedmann-Robertson-Walker metric for spatially closed geometries. The problem of the singularity formation at quantum level is addressed.
description: 25 pages, 6 figures, v2: extended version, v3: published version, minor corrections