cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
p-adic modular forms of non-integral weight over Shimura curves
Creators: name: Brasca, Riccardo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11F85 (Primary) 14G35 (Secondary)

description: In this work, we set up a theory of p-adic modular forms over Shimura curves over totally real fields which allows us to consider also non-integral weights. In particular, we define an analogue of the sheaves of k-th invariant differentials over the Shimura curves we are interested in, for any p-adic character. In this way, we are able to introduce the notion of overconvergent modular form of any p-adic weight. Moreover, our sheaves can be put in p-adic families over a suitable rigid-analytic space, that parametrizes the weights. Finally, we define Hecke operators, including the U operator, that acts compactly on the space of overconvergent modular forms. We also construct the eigencurve.
description: 30 pages. Submitted
Learning from the past, examining the present and planning for the future : genetic approaches to the conservation of giant Galápagos tortoises
Creators: name: Jensen, Evelyn Lise
Publisher: name: University of British Columbia
Year: 2017

description: Population genetics allows us to interpret the historical information contained in DNA, telling the story of population dynamics, demography and divergences, both recent and ancient, providing insights difficult or otherwise impossible to obtain. My PhD thesis research addresses fundamental questions in conservation genetics and demonstrates the utility of incorporating genetic information into conservation planning. Prioritizing taxa to receive conservation efforts is a difficult and contentious issue. Numerous methods have been proposed to rank taxa based on the importance of the phylogenetic diversity they contribute. However, all of these metrics share a flaw, in that complementarity among taxa is not taken into account when determining rankings. Here I propose a new method, I-HEDGE, which is an improvement on existing metrics as it integrates evolutionary isolation, probability of extinction and complementarity. Another area I address is that all too often the genetic impacts of conservation activities, including captive breeding and head-start programs, go unmonitored, which can result in losses of genetic diversity. The giant Galápagos tortoises endemic to Pinzón Island narrowly escaped extinction in the 20th century thanks to an intensive head-start program, now operating for 50 years. I evaluated two cohorts of the head-start program in detail using microsatellite markers to determine how representative they are of the extent and distribution of genetic variation in the wild population, which is one of the goals of the program. The cohorts were not representative of the sample of wild adults used for comparison, but the Pinzón tortoises appear to have retained a remarkable amount of genetic variation despite their near extinction. The genomic consequences of a rapid population decline and recovery, such as that experienced by the Pinzón tortoise, have rarely been empirically evaluated. This study system has the advantage of a large number of historical specimens collected in 1906, allowing a direct evaluation of genomic patterns pre- and post-decline. By estimating effective population sizes and patterns of diversity in the historical and contemporary populations, it became clear that despite their near extinction, the Pinzón tortoises have retained high levels of diversity thanks to their demographic history and quick recovery.
Super revivals and sub-Planck scale structures of a slightly relativistic particle in a box
Creators: name: Ghosh, Suranjana
name: Marzoli, Irene
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The time evolution of a particle, caught in an infinitely deep square well, displays unexpected features, when one includes tiny relativistic effects. Indeed, even the smallest corrections to the non-relativistic quadratic spectrum manifest themselves in a dramatic way. Our theoretical analysis brings to light a completely new time scale, at which the system exhibits surprisingly perfect revivals. This longer time scale rules the system dynamics and replaces the original revival time of the unperturbed system. The early manifestation of such phenomenon is captured by the sensitivity of sub-Planck structures for different values of the relativistic corrections.
description: 13 pages, 4 figures, Accepted in Int. J. Quantum Information
Star Stability and Star Regularity for Mori Domains
Creators: name: Gabelli, Stefania
name: Picozza, Giampaolo
Publisher: name: arXiv
Year: 2010
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: In the last few years, the concepts of stability and Clifford regularity have been fruitfully extended by using star operations. In this paper we study and put in relation these properties for Noetherian and Mori domains, substantially improving several results present in the literature.
description: 14 pages; Rend. Semin. Mat. Univ. Padova, 2011
The voice box : a fast coupled vocal fold model for articulatory speech synthesis
Creators: name: Vasudevan, Arvind
Publisher: name: University of British Columbia
Year: 2017

description: Speech is unique to human beings as a means of communication and many efforts have been made towards understanding and characterizing speech. In particular, articulatory speech synthesis is a critical field of study as it works towards simulating the fundamental physical phenomena that underlines speech. Of the various components that constitute an articulatory speech synthesizer, vocal fold models play an important role as the source of the acoustic simulation. A balance between the simplicity and speed of lumped-element vocal fold models and the completeness and complexity of continuum-models is required to achieve time-efficient high-quality speech synthesis. In addition, most models of the vocal folds are seen in a vacuum without any coupling to the vocal tract model. This thesis aims to fill these lacunae in the field through two major contributions. We develop and implement a novel self-oscillating vocal-fold model, composed of an 1D unsteady fluid model loosely coupled with a 2D finite-element structural model. The flow model is capable of handling irregular geometries, different boundary conditions, closure of the glottis and unsteady flow states. A method for a fast decoupled solution of the flow equations that does not require the computation of the Jacobian matrix is provided. The simulation results are shown to agree with existing data in literature, and give realistic glottal pressure-velocity distributions, glottal width and glottal flow values. In addition, the model is more than order of magnitude faster than comparable 2D Navier-Stokes fluid solvers while better capturing transitional flow than simple Bernoulli-based flow models. Secondly, as an illustrative case study, we implement a complete articulatory speech synthesizer using our vocal fold model. This includes both lumped-element and continuum vocal fold models, a 2D finite-difference time-domain solver of the vocal tract, and a 1D tracheal model. A clear work flow is established to derive model components from experimental data or user-specified meshes, and run fully-coupled acoustic simulations. This leads to one of the few complete articulatory speech synthesizers in literature and a valuable tool for speech research to run time-efficient speech simulations, and thoroughly study the acoustic outcomes of model formulations.
Nucleon distribution amplitudes and proton decay matrix elements on the lattice
Creators: name: Braun, Vladimir M.
name: Göckeler, Meinulf
name: Horsley, Roger
name: Kaltenbrunner, Thomas
name: Nakamura, Yoshifumi
name: Pleiter, Dirk
name: Rakow, Paul E. L
name: Schäfer, Andreas
name: Schierholz, Gerrit
name: Stüben, Hirnnerk
name: Warkentin, Nikolaus
name: Zanotti, James M.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 12.38.Gc, 11.15.Ha

description: Baryon distribution amplitudes (DAs) are crucial for the theory of hard exclusive reactions. We present a calculation of the first few moments of the leading-twist nucleon DA within lattice QCD. In addition we deal with the normalization of the next-to-leading (twist-four) DAs. The matrix elements determining the latter quantities are also responsible for proton decay in grand unified theories. Our lattice evaluation makes use of gauge field configurations generated with two flavors of clover fermions. The relevant operators are renormalized nonperturbatively with the final results given in the MS̅ scheme. We find that the deviation of the leading-twist nucleon DA from its asymptotic form is less pronounced than sometimes claimed in the literature.
Etude européenne CAREGIVERSPRO-MMD portant sur les nouvelles technologies dédiées au soutien des personnes ayant une maladie d'Alzheimer et apparentée et leurs aidants. Profil des aidants en France
Creators: name: L. MALHERBE, H. LINGIAH
Publisher: name: Zenodo
Year: 2019
Subjects: caregiver
platform
ICT
neurocognitve disorder
Alzheimer

description: e-poster presented to the 38th national congress of the Société Française de de Gériatrie et Gérontologie in Paris.

The European project CAREGIVERSPRO-MMD aims to develop a digital platform to support people with neurocognitive disorders and their carers by providing them with educational and informative content adapted to the disease and the role of carer, discussion spaces, cognitive stimulation games, a news feed, an agenda and local information (events, social structures, places of information and support...).

To evaluate the effectiveness of this platform, we recruited "caregiver-patients" dyads from the people followed in memory consultation.

We present the profile of the caregivers who participated in this study in France
Supporting Information for "Lithium isotope constraints on slab and mantle contribution to arc magmas"
Creators: name: Zhang, Wei
name: Kitagawa, Hiroshi
name: Nakamura, Eizo
Publisher: name: figshare
Year: 2023
Subjects: Geodynamics
Geology not elsewhere classified
Geophysics not elsewhere classified
Igneous and metamorphic petrology
Geochemistry not elsewhere classified

description: Supporting Information for the article entitled "Lithium isotope constraints on slab and mantle contribution to arc magmas" published in Journal of Geophysical Research Solid Earth (https://doi.org/10.1029/2022JB025670)
Randall-Sundrum brane cosmology: modification of late-time cosmic dynamics by exotic matter
Creators: name: García-Salcedo, Ricardo
name: Gonzalez, Tame
name: Moreno, Claudia
name: Quiros, Israel
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we show, through the study of concrete examples, that, depending on the cosmic dynamics of the energy density of matter degrees of freedom living in the brane, Randall-Sundrum (RS) brane effects can be important not only at short distances (UV regime), but also at large cosmological scales (IR regime). Our first example relies on the study, by means of the dynamical systems tools, of a toy model based in a non-linear electrodynamics (NLED) Lagrangian. Then we show that other, less elaborated models, such as the inclusion of a scalar phantom field, and of a tachyon phantom field -- trapped in the brane -- produce similar results. The form of the RS correction seems to convert what would have been future attractors in general relativity into saddle points. The above "mixing of scales" effect is distinctive only of theories that modify the right-hand-side (matter part) of the Friedmann equation, so that, for instance, DGP-brane models do not show this feature.
description: Latex, 12 pages, 9 eps figures. Title changed, discussion improved. Version that matches the one published in CQG
Vortex Rings in Fast Rotating Bose-Einstein Condensates
Creators: name: Rougerie, Nicolas
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q55, 47J30, 76M23. PACS: 03.75.Hh, 47.32.-y, 47.37.+q

description: When Bose-Eintein condensates are rotated sufficiently fast, a giant vortex phase appears, that is the condensate becomes annular with no vortices in the bulk but a macroscopic phase circulation around the central hole. In a former paper [M. Correggi, N. Rougerie, J. Yngvason, {\it arXiv:1005.0686}] we have studied this phenomenon by minimizing the two dimensional Gross-Pitaevskii energy on the unit disc. In particular we computed an upper bound to the critical speed for the transition to the giant vortex phase. In this paper we confirm that this upper bound is optimal by proving that if the rotation speed is taken slightly below the threshold there are vortices in the condensate. We prove that they gather along a particular circle on which they are evenly distributed. This is done by providing new upper and lower bounds to the GP energy.
description: to appear in Archive of Rational Mechanics and Analysis
Scale dependence of twist-three contributions to single spin asymmetries
Creators: name: Braun, Vladimir M.
name: Manashov, Alexander
name: Pirnay, Björn
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 12.38.Bx, 13.88.+e, 12.39.St

description: We reexamine the scale dependence of twist-three correlation functions relevant for the single transverse spin asymmetry in the framework of collinear factorization. Evolution equations are derived for both the flavor-nonsinglet and flavor-singlet distributions and arbitrary parton momenta. Our results do not agree with the recent calculations of the evolution in the limit of vanishing gluon momentum. Possible sources for this discrepancy are identified.
Cosmography beyond standard candles and rulers
Creators: name: Xia, Jun-Qing
name: Vitagliano, Vincenzo
name: Liberati, Stefano
name: Viel, Matteo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We perform a cosmographic analysis using several cosmological observables such as the luminosity distance moduli, the volume distance, the angular diameter distance and the Hubble parameter. These quantities are determined using different data sets: Supernovae type Ia and Gamma Ray Bursts, the Baryonic Acoustic Oscillations, the cosmic microwave background power spectrum and the Hubble parameter as measured from surveys of galaxies. This data set allows to put constraints on the cosmographic expansion with unprecedented precision. We also present forecasts for the coefficients of the kinematic expansion using future but realistic data sets: constraints on the coefficients of the expansions are likely to improve by a factor ten with the upcoming large scale structure probes. Finally, we derive the set of the cosmographic parameters for several cosmological models (including $Λ$CDM) and compare them with our best fit set. While distance measurements are unable to discriminate among these models, we show that the inclusion of the Hubble data set leads to strong constraints on the lowest order coefficients and in particular it is incompatible with $Λ$CDM at 3-$σ$ confidence level. We discuss the reliability of this determination and suggest further observations which might be of crucial importance for the viability of cosmographic tests in the next future.
description: 15 pages, 2 figures, 2 tables, Accepted for publication in PRD
Baryon operators of higher twist in QCD and nucleon distribution amplitudes
Creators: name: Braun, Vladimir M.
name: Manashov, Alexander
name: Rohrwild, Jürgen
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik

description: We develop a general theoretical framework for the description of higher-twist baryon operators which makes maximal use of the conformal symmetry of the QCD Lagrangian. The conformal operator basis is constructed for all twists. The complete analysis of the one-loop renormalization of twist-4 operators is given. The evolution equation for three-quark operators of the same chirality turns out to be completely integrable. The spectrum of anomalous dimensions coincides in this case with the energy spectrum of the twist-4 subsector of the SU(2,2) Heisenberg spin chain. The results are applied to give a general classification and calculate the scale dependence of subleading twist-4 nucleon distribution amplitudes that are relevant for hard exclusive reactions involving a helicity flip. In particular we find an all-order expression (in conformal spin) for the contributions of geometric twist-3 operators to the (light-cone) twist-4 nucleon distribution amplitudes, which are usually referred to as Wandzura–Wilczek terms.
Distribution amplitudes of the Λb baryon in QCD
Creators: name: Ball, Patricia
name: Braun, Vladimir M.
name: Gardi, Einan
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 530 Physik

description: The QCD description of exclusive decays of the Λb baryon involves hadronic matrix elements of non-local light ray operators, the light-cone distribution amplitudes. We introduce the complete set of three-quark distribution amplitudes and calculate the renormalization scale dependence for the leading twist. At leading order in the strong coupling the evolution is driven by pairwise two-quark interactions: heavy–light involving Sudakov logarithms as in the B-meson case, and light–light as in light mesons. We solve the evolution equation and show that its main effect is to generate a radiative tail extending to high energies. Finally, we present simple models for the distribution amplitudes based on QCD sum rules, and study the effect of the evolution on these models.
Essays in information economics
Creators: name: Martineau, Charles
Publisher: name: University of British Columbia
Year: 2017

description: I present three essays on Information Economics. The first essay consists of analyzing high-frequency price dynamics around earnings announcements for the largest 1,500 U.S. stocks between 2011 and 2015. Price discovery following earnings surprises mostly occurs in the after-hours market, following the earnings announcement, and is generally complete by 10 a.m. Eighty percent of the price response to earnings surprises in the after-hours market occurs upon arrival of the first trades. Price reactions are largely explained by earnings surprises and not by order flow, consistent with the theoretical view that news can incorporate prices instantly. In the second essay, co-authored with Oliver Boguth and Vincent Grégoire, we show that in an effort to increase transparency, the Chair of the Federal Reserve now holds a press conference following some, but not all, Federal Open Market Committee announcements. Press conferences are scheduled independently of economic conditions and communicate little information. Evidence from financial markets demonstrates that investors lower their expectations of important decisions on days without press conferences, and we show that they shift attention away from these announcements. Both channels prevent effective monetary policy, as the committee is averse to surprising markets and aims to coordinate market expectations. Correspondingly, we show that announcements without press conferences convey less price-relevant information. In the third essay, co-authored with Adlai J. Fisher and Jinfei Sheng, we construct indices of media attention to macroeconomic risks including employment, growth, inflation and monetary policy. Attention rises around macroeconomic announcements and following changes in fundamentals over quarterly, annual, and business cycle horizons. The effect is asymmetric, with bad news raising attention more than good news. Increases in aggregate trade volume and volatility coincide with rising attention, controlling for announcements. Finally, changes in attention prior to the unemployment announcement predict both the announcement surprise and stock returns on the announcement day. We conclude that media attention to macroeconomic fundamentals provides useful information beyond the dates and contents of macroeconomic announcements.
Holographic quantum criticality and strange metal transport
Creators: name: Kim, Bom Soo
name: Kiritsis, Elias
name: Panagopoulos, Christos
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A holographic model of a quantum critical theory at a finite but low temperature, and finite density is studied. The model exhibits non-relativistic z=2 Schrödinger symmetry and is realized by the Anti-de-Sitter-Schwarzschild black hole in light-cone coordinates. Our approach addresses the electrical conductivities in the presence or absence of an applied magnetic field and contains a control parameter that can be associated to quantum tuning via charge carrier doping or an external field in correlated electron systems. The Ohmic resistivity, the inverse Hall angle, the Hall coefficient and the magnetoresistance are shown to be in good agreement with experimental results of strange metals at very low temperature. The holographic model also predicts new scaling relations in the presence of a magnetic field.
description: 39 pages, 7 figures, (v2) Major revision that considers a wider range of phenomena, explanations and comparisons to experimental data. arXiv admin note: text overlap with arXiv:1107.2116
Phegea51-2. Melitaea telona complex of species (Lepidoptera: Nymphalidae: Nymphalinae: Melitaeini) in the Levant and description of a new species
Creators: name: Benyamini, Dubi
Publisher: name: figshare
Year: 2023
Subjects: Animal behaviour

description: The representatives of the Melitaea telona complex of species (Nymphalidae) in the Levant region are reviewed, certain genitalia traits are analyzed and discussed. The lectotype of Melitaea phoebe dorae Graves, 1925, is designated, resulting in M. phoebe telona Fruhstorfer, 1908 as a senior species-group name. In our analysis three species are involved: (1) Melitaea klili Benyamini, 2021 multi-brooded species, the “ancestor” of the group (with genitalia type A); (2) Melitaea telona Fruhstorfer, 1908 single-brooded east Mediterranean species (with genitalia types A and B), and (3) Melitaea tzinensis n. sp., which originates in the southern and eastern deserts and desiccated biotopes in the Levant (with genitalia type B). Melitaea phoebe telona Fruhstorfer, 1908 is synonymized with Melitaea phoebe dorae Graves 1925, n. syn. I present the results regarding the male genitalia trait analysis and remark on the evolutionary history of these Levant M. telona spp. reflecting the climate change in the east Mediterranean region since the last glacial period.
Slow and fast scales for superprocess limits of age-structured populations
Creators: name: Méléard, Sylvie
name: Tran, Viet Chi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: A superprocess limit for an interacting birth-death particle system modelling a population with trait and physical age-structures is established. Traits of newborn offspring are inherited from the parents except when mutations occur, while ages are set to zero. Because of interactions between individuals, standard approaches based on the Laplace transform do not hold. We use a martingale problem approach and a separation of the slow (trait) and fast (age) scales. While the trait marginals converge in a pathwise sense to a superprocess, the age distributions, on another time scale, average to equilibria that depend on traits. The convergence of the whole process depending on trait and age, only holds for finite-dimensional time-marginals. We apply our results to the study of examples illustrating different cases of trade-off between competition and senescence.
An effective approach to the problem of time
Creators: name: Bojowald, Martin
name: Hoehn, Philipp A
name: Tsobanjan, Artur
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A practical way to deal with the problem of time in quantum cosmology and quantum gravity is proposed. The main tool is effective equations, which mainly restrict explicit considerations to semiclassical regimes but have the crucial advantage of allowing the consistent use of local internal times in non-deparameterizable systems. Different local internal times are related merely by gauge transformations, thereby enabling relational evolution through turning points of non-global internal times. The main consequence of the local nature of internal time is the necessity of its complex-valuedness, reminiscent of but more general than non-unitarity of evolution defined for finite ranges of time. By several general arguments, the consistency of this setting is demonstrated. Finally, we attempt an outlook on the nature of time in highly quantum regimes. The focus of this note is on conceptual issues.
description: 20 pages; v2: additional discussions mainly in Sec. 4
Infrared Spectral Energy Distribution of Galaxies in the AKARI All Sky Survey: Correlations with Galaxy Properties, and Their Physical Origin
Creators: name: Totani, Tomonori
name: Takeuchi, Tsutomu T.
name: Nagashima, Masahiro
name: Kobayashi, Masakazu A. R.
name: Makiya, Ryu
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have studied the properties of more than 1600 low-redshift galaxies by utilizing high-quality infrared flux measurements of the AKARI All-Sky Survey and physical quantities based on optical and 21-cm observations. Our goal is to understand the physics determining the infrared spectral energy distribution (SED). The ratio of the total infrared luminosity L_TIR, to the star-formation rate (SFR) is tightly correlated by a power-law to specific SFR (SSFR), and L_TIR is a good SFR indicator only for galaxies with the largest SSFR. We discovered a tight linear correlation for normal galaxies between the radiation field strength of dust heating, estimated by infrared SED fits (U_h), and that of galactic-scale infrared emission (U_TIR ~ L_TIR/R^2), where R is the optical size of a galaxy. The dispersion of U_h along this relation is 0.3 dex, corresponding to 13% dispersion in the dust temperature. This scaling and the U_h/U_TIR ratio can be explained physically by a thin layer of heating sources embedded in a thicker, optically-thick dust screen. The data also indicate that the heated fraction of the total dust mass is anti-correlated to the dust column density, supporting this interpretation. In the large U_TIR limit, the data of circumnuclear starbursts indicate the existence of an upper limit on U_h, corresponding to the maximum SFR per gas mass of ~ 10 Gyr^{-1}. We find that the number of galaxies sharply drops when they become optically thin against dust-heating radiation, suggesting that a feedback process to galaxy formation (likely by the photoelectric heating) is working when dust-heating radiation is not self-shielded on a galactic scale. Implications are discussed for the M_HI-size relation, the Kennicutt-Schmidt relation, and galaxy formation in the cosmological context.
description: 29 pages including 28 figures. matches the published version (PASJ 2011 Dec. 25 issue). The E-open option was chosen for this article, i.e., the official version available from PASJ site (http://pasj.asj.or.jp/v63/n6/630613/630613-frame.html) without restriction
Photoluminescence of tetrachloroarsenate(III)
Creators: name: Kunkely, Horst
name: Pawlowski, V.
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 540 Chemie

description: Glasses of (NBu4)AsCl4 in ethanol at 77 K show a red emission at λmax=617 nm with Ø≈ 10−4 and τ=0.46 μs. It is suggested that this luminescence originates from the sp excited state 3P1 of the As3+ ion. The excited state properties of AsCl−4 are discussed in comparison to those of SbCl−4 and BiCl−4.
Electronic Structure and Spectroscopic Properties of Copper Catecholate Complexes with Interligand Charge Transfer Behavior
Creators: name: Benedix, R.
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 540 Chemie

description: The structural and spectroscopic properties of copper catecholate complexes with nitrogen ligands of the α- diimine type are studied by qualitative MO considerations. The characteristic feature of these donor acceptor systems is an interligand charge-transfer from the catecholate donor to the α-diimine acceptor site. The dependence of the interligand charge-transfer absorption band on the energies of the acceptor and the donor levels as well as on the solvent polarity is discussed.
Topological toric manifolds
Creators: name: Ishida, Hiroaki
name: Fukukawa, Yukiko
name: Masuda, Mikiya
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Topology (math.AT)
subject: Algebraic Geometry (math.AG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53D20, 57S15, 14M25

description: We introduce the notion of a topological toric manifold and a topological fan and show that there is a bijection between omnioriented topological toric manifolds and complete non-singular topological fans. A topological toric manifold is a topological analogue of a toric manifold and the family of topological toric manifolds is much larger than that of toric manifolds. A topological fan is a combinatorial object generalizing the notion of a simplicial fan in toric geometry. Prior to this paper, two topological analogues of a toric manifold have been introduced. One is a quasitoric manifold and the other is a torus manifold. One major difference between the previous notions and topological toric manifolds is that the former support a smooth action of an $S^1$-torus while the latter support a smooth action of a $\C^*$-torus. We also discuss their relation in details.
description: 42 pages, 4 figures
Photoredox chemistry of iodomercurate(II) complexes in acetonitrile
Creators: name: Horváth, O.
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: Photochemistry; Redox reactions; Mercury complexes; Iodo complexes
subject: 540 Chemie

description: The stepwise formation constants of the kinetically labile iodomercurates(II) in acetonitrile are relatively high; even for the tetraiodo complex a value of 1220 was determined. Ligand-to-metal charge transfer transitions of different energies and intensities feature the ultraviolet spectra of these compounds. Photolysis of their CH3CN solution results in the formation of Hg(l) and I or I2− as primary products. The quantum yields of this reaction are 0.8 and 0.41 for HgI3− and HgI42−, respectively, at 355 nm excitation in a deaerated system. Due to the very efficient back reaction HgI2 does not undergo permanent photoredox change, while irradiation of tri- and tetraiodomercurate(II) complexes leads to the accumulation of I2 and I3−. The efficiencies of these overall reactions are rather low (0.07 and 0.02 at 333 nm), compared to the primary quantum yields, because of the fast reconversion.
Electroproduction of the N*(1535) Resonance at Large Momentum Transfer
Creators: name: Braun, Vladimir M.
name: Göckeler, Meinulf
name: Horsley, Roger
name: Kaltenbrunner, Thomas
name: Lenz, Alexander
name: Nakamura, Yoshifumi
name: Pleiter, Dirk
name: Rakow, Paul E. L
name: Rohrwild, Jürgen
name: Schierholz, Gerrit
name: Schäfer, Andreas
name: Stüben, Hirnnerk
name: Warkentin, Nikolaus
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik
subject: 12.38.Gc, 12.38.Lg, 13.40.Gp, 14.20.Gk

description: We report on the first lattice calculation of light-cone distribution amplitudes of the N*(1535) resonance, which are used to calculate the transition form factors at large momentum transfers using light-cone sum rules. In the region Q2>2 GeV2, where the light-cone expansion is expected to converge, the results appear to be in good agreement with the experimental data.
Proton dissociation into three jets
Creators: name: Braun, Vladimir M.
name: Ivanov, Dmitri
name: Schäfer, Andreas
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 530 Physik

description: We explore the possibility to observe hard exclusive three-jet production in early LHC runs, corresponding to diffractive dissociation of the incident proton into three jets with large but compensating transverse momenta. This process is sensitive to the proton unintegrated gluon distribution at small x and to the distribution of the three valence quarks in the proton at small transverse distances. The corresponding cross section is calculated using an approach based on kt factorization. According to our estimates, observation of hard diffractive three-jet production at LHC is feasible for jet transverse momenta qperpendicularnot, vert, similar5 GeV.
Phegea51-2. A morphological study of Leptidea (Lepidoptera: Pieridae) species from south-western Bulgaria
Creators: name: Konečný, Karel
Publisher: name: figshare
Year: 2023
Subjects: Animal behaviour

description: The author presents the morphological observations of three males and two females of a species from the genus Leptidea (Pieridae).
An approach for solving the boundary free edge difficulties in SPH modelling: application to a viscous accretion disc in close binaries
Creators: name: Lanzafame, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In this work, we propose a SPH interpolating Kernel reformulation suitable also to treat free edge boundaries in the computational domain. Application to both inviscid and viscous stationary low compressibility accretion disc models in Close Binaries (CB) are shown. The investigation carried out in this paper is a consequence of the fact that a low compressibility modelling is crucial to check numerical reliability. Results show that physical viscosity supports a well-bound accretion disc formation, despite the low gas compressibility, when a Gaussian-derived Kernel (from the Error Function) is assumed, in extended particle range - whose Half Width at Half Maximum (HWHM) is fixed to a constant $h$ value - without any spatial restrictions on its radial interaction (hereinafter GASPHER). At the same time, GASPHER ensures adequate particle interpolations at the boundary free edges. Both SPH and adaptive SPH (hereinafter ASPH) methods lack accuracy if there are not constraints on the boundary conditions, in particular at the edge of the particle envelope: Free Edge (FE) conditions. In SPH, an inefficient particle interpolation involves a few neighbour particles; instead, in the second case, non-physical effects involve both the boundary layer particles themselves and the radial transport. Either in a regime where FE conditions involve the computational domain, or in a viscous fluid dynamics, or both, a GASPHER scheme can be rightly adopted in such troublesome physical regimes. Despite the applied low compressibiity condition, viscous GASPHER model shows clear spiral pattern profiles demonstrating the better quality of results compared to SPH viscous ones. Moreover a successful comparison of results concerning GASPHER 1D inviscid shock tube with analytical solution is also reported.
description: 18 pages, 12 figures
Photoluminescence of a triangular Hg₃⁴⁺ cluster
Creators: name: Kunkely, Horst
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 540 Chemie

description: The cluster compound Hg3 (μ-dppm)3(SO4)2 (dppm = diphenylphosphinomethane) which contains the triangular Hg4+3 moiety shows an intense low-temperature ( 77 K ) photoluminescence at λmax = 658 nm. This emission is assumed to originate from a metal-centered ss excited state which undergoes a Jahn—Teller distortion.
Nodal dynamics, not degree distributions, determine the structural controllability of complex networks
Creators: name: Cowan, Noah J.
name: Chastain, Erick J.
name: Vilhena, Daril A.
name: Freudenberg, James S.
name: Bergstrom, Carl T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Structural controllability has been proposed as an analytical framework for making predictions regarding the control of complex networks across myriad disciplines in the physical and life sciences (Liu et al., Nature:473(7346):167-173, 2011). Although the integration of control theory and network analysis is important, we argue that the application of the structural controllability framework to most if not all real-world networks leads to the conclusion that a single control input, applied to the power dominating set (PDS), is all that is needed for structural controllability. This result is consistent with the well-known fact that controllability and its dual observability are generic properties of systems. We argue that more important than issues of structural controllability are the questions of whether a system is almost uncontrollable, whether it is almost unobservable, and whether it possesses almost pole-zero cancellations.
description: 1 Figures, 6 pages
Conductance of junctions of multiple interacting quantum wires and long Aharonov-Bohm-Kondo rings
Creators: name: Shi, Zheng
Publisher: name: University of British Columbia
Year: 2017

description: In this thesis, we calculate the linear dc conductance of two types of multi-terminal interacting systems: junctions of interacting quantum wires attached to Tomonaga-Luttinger liquid (TLL) leads, and closed and open long Aharonov-Bohm-Kondo (ABK) rings. In both cases, we obtain corrections to the non-interacting Landauer formula, arising from interactions in the TLL leads and the quantum dot in the Kondo regime respectively. In junctions of interacting quantum wires, if the wires are attached to Fermi liquid (FL) leads, the conductance is formally given by the Landauer formula with renormalized single-particle S-matrix elements. If, however, the wires are attached to TLL leads, i.e. the interaction does not vanish even in the leads, the conductance has an additional contribution dependent on the interaction strength in the leads. We calculate this additional contribution both at the first order in interaction and in the random phase approximation, and heuristically relate the FL conductance to the TLL conductance through a "contact resistance" between an FL lead and a TLL wire. In long ABK rings, where the interaction is due to spin-flip scattering at a quantum dot in the Kondo regime, the linear dc conductance consists of two parts: a disconnected part of the Landauer form, and a connected part that can be approximately eliminated at low temperatures. For a closed long ABK ring, where the electric current is conserved in the ring, the high-temperature conductance has qualitatively different behaviors for temperatures greater than and lower than the characteristic energy scale v_F /L, where v_F is the Fermi velocity and L is the ring circumference. Meanwhile, for an open long ABK ring where electrons may leak into the side leads coupled to ring arms, as long as the ring arms have both small transmission and small reflection, the ring behaves as a two-path Aharonov-Bohm interferometer, and we predict the observation of a π/2 phase shift due to scattering off the Kondo singlet formed at low energies around the impurity spin.
Exclusive processes in position space and the pion distribution amplitude
Creators: name: Braun, Vladimir M.
name: Müller, Dieter
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 530 Physik
subject: 12.38.-t, 14.20.Dh; 13.40.Gp

description: We suggest to carry out lattice calculations of current correlators in position space, sandwiched between the vacuum and a hadron state (e.g. pion), in order to access hadronic light-cone distribution amplitudes (DAs). In this way the renormalization problem for composite lattice operators is avoided altogether, and the connection to the DA is done using perturbation theory in the continuum. As an example, the correlation function of two electromagnetic currents is calculated to the next-to-next-to-leading order accuracy in perturbation theory and including the twist-four corrections. We argue that this strategy is fully competitive with direct lattice measurements of the moments of the DA, defined as matrix elements of local operators, and offers new insight in the space-time picture of hard exclusive reactions.
Bloch space structure, the qutrit wave function and atom-field entanglement in three-level systems
Creators: name: Sen, Surajit
name: Nath, Mihir Ranjan
name: Dey, Tushar Kanti
name: Gangopadhyay, Gautam
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We have given a novel formulation of the exact solutions for the lambda, vee and cascade three-level systems where the Hamiltonian of each configuration is expressed in the SU(3) basis. The solutions are discussed from the perspective of the Bloch equation and the atom-field entanglement scenario. For the semiclassical systems, the Bloch space structure of each configuration is studied by solving the corresponding Bloch equation and it is shown that at resonance, the eight-dimensional Bloch sphere is broken up into two distinct subspaces due to the existence of a pair of quadratic constants. Because of the different structure of the Hamiltonian in the SU(3) basis, the non-linear constants are found to be distinct for different configurations. We propose a possible representation of the qutrit wave function and show its equivalence with the three-level system. Taking the bichromatic cavity modes to be in the coherent state, the amplitudes of all three quantized systems are calculated by developing an Euler angle based dressed state scheme. Finally following the Phoenix-Knight formalism, the interrelation between the atom-field entanglement and population inversion for all configurations is studied and the existence of collapses and revivals of two different types is pointed out for the equidistant cascade system in particular.
description: 33 pages, 6 figures, revised version
Wilson Loops with Lagrangians: Large Spin OPE and Cusp Anomalous Dimension Dictionary
Creators: name: Bargheer, Till
name: Bercini, Carlos
name: Fernandes, Bruno
name: Gonçalves, Vasco
name: Mann, Jeremy
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the context of planar conformal gauge theory, we study five-point correlation functions between the interaction Lagrangian and four of the lightest single-trace, gauge-invariant scalar primaries. After performing two light-cone OPEs, we express this correlator in terms of the three-point functions between two leading-twist spinning operators and the Lagrangian. For finite values of spin, we compute these structure constants in perturbation theory up to two loops in N=4 super Yang-Mills theory. Large values of spin are captured by null polygon kinematics, where we use dualities with null polygon Wilson loops as well as factorization properties to bootstrap the universal behavior of the structure constants at all loops. We find explicit maps that relate the Lagrangian structure constants with the leading-twist anomalous dimension. From the large-spin map, we recover the cusp anomalous dimension at strong and weak coupling, including genus-one terms.
description: 10 pages, 1 figure, 1 mathematica notebook, v2: various improvements, new figure, published version
A local induced action for the noncritical string
Creators: name: Westra, W.
name: Zohren, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present an alternative to Polyakov's induced action for the noncritical string. Our Yang-Mills like action is both local and invariant under coordinate transformations. It defines a teleparallel theory of gravity with interesting links to Horava-Lifshitz and Einstein-aether theories. It is of Liouville type in the conformal gauge while, remarkably, in the proper-time gauge it gives an effective action familiar from the Causal Dynamical Triangulation (CDT) approach to 2d quantum gravity. In the latter gauge the effective action is especially interesting since its quantization is known to reduce to a quantum mechanical model.
description: 9 pages, no figures, as published
Обеспечение устойчивой работы асинхронного двигателя привода вентилятора тепловоза
Creators: name: Владимировна, Шевченко Валентина
name: Ханин Олег Олегович
Publisher: name: Zenodo
Year: 2016
Subjects: электрические машины
асинхронные двигатели
АД
система регулирования АД

description: На русском: [Шевченко В.В., Ханин О.О. Обеспечение устойчивой работы асинхронного двигателя привода вентилятора тепловоза // Тезисы докладов 24-й международной научно-практической конференции "Информационные технологии: наука, техника, технология, образование, здоровье" (MicroCAD-2016), 18-20 мая 2016 года, Харьков (ISSN 2222-2944), часть 2, cекция 9 "Электромеханическое и электрическое преобразование энергии". - Украина, Харьков: НТУ "ХПИ", 2016. - С. 130. https://doi.org/10.5281/zenodo.2595354]

Ключевые слова: электрические машины, асинхронные двигатели (АД), система регулирования АД.

Репозиторий НТУ "ХПИ" - открыть pdf. Архив НТУ "ХПИ" - открыть pdf (http, https).

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Сборник в репозитории НТУ "ХПИ" - открыть pdf (все тома), на zenodo - скачать pdf.
Phegea51-2. Book review. Basquin P. & Faravel G. 2022. Les Saturnidés du Gabon. Catalogue illustré des Saturniidae du Gabon. Tome 2: Buneini, Attacini.
Creators: name: De Prins, Willy
Publisher: name: figshare
Year: 2023
Subjects: Animal behaviour

description: In dit tweede deel van de geïllustreerde catalogus van de Saturniidae van Gabon worden alle soorten opgenomen uit de Buneini en Attacini. Het gaat om 47 verschillende soorten waarvan de meeste een groter formaat hebben dan de soorten uit het eerste deel. Dat maakt dat er slechts twee foto's van adulten op één pagina kunnen en daarmee is het boek dus iets dikker uitgevallen, ook al is het aantal behandelde soorten iets kleiner dan in het eerste deel (60 soorten).
Photochemistry of cyclopentadienylthallium(I)
Creators: name: Kunkely, Horst
name: Vogler, Arnd
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 540 Chemie

description: TlC5H5 displays absorption maxima at 228 and 280 nm which are assigned to metal-centred sp and ligand-to-metal charge transfer (LMCT) transitions, respectively. The complex shows an emission at λmax = 360 nm which originates from a low-energy sp excited state. The photolysis of TlC5H5 in methanol proceeds according to the equation TlC5H5 + CH3OH → TlOH + H2 + C6H6 (pentafulvene) with φ = 0.1 at λirr = 254 nm and 0.008 at 313 nm. It is suggested that this photoreaction is induced by LMCT excitation.