cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr$_5$Pt$_3$: A muon spin rotation and relaxation ($μ$SR) study
Creators: name: Bhattacharyya, A
name: Ferreira, P P
name: Panda, K
name: Santos, F B
name: Adroja, D T
name: Yokoyama, K
name: Dorini, T T
name: Eleno, L T F
name: Machado, A J S
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the present work we demonstrate that C-doped Zr$_{5}$Pt$_{3}$ is an electron-phonon superconductor (with critical temperature T$_\mathrm{C}$ = 3.7\,K) with a nonsymmorphic topological Dirac nodal-line semimetal state, which we report here for the first time. The superconducting properties of Zr$_{5}$Pt$_{3}$C$_{0.5}$ have been investigated by means of magnetization and muon spin rotation and relaxation ($μ$SR) measurements. We find that at low temperatures the depolarization rate is almost constant and can be well described by a single-band $s-$wave model with a superconducting gap of $2Δ(0)/k_\mathrm{B}T_\mathrm{C}$ = 3.84, close to the value of BCS theory. From transverse field $μ$SR analysis we estimate the London penetration depth $λ_{L}$ = 469 nm, superconducting carrier density $n_{s}$ = 2$\times$10$^{26}$ $m^{-3}$, and effective mass m$^{*}$ = 1.584 $m_{e}$. Zero field $μ$SR confirms the absence of any spontaneous magnetic moment in the superconducting ground state. To gain additional insights into the electronic ground state of C-doped Zr$_5$Pt$_3$, we have also performed first-principles calculations within the framework of density functional theory (DFT). The observed homogenous electronic character of the Fermi surface as well as the mutual decrease of $T_\mathrm{C}$ and density of states at the Fermi level are consistent with the experimental findings. However, the band structure reveals the presence of robust, gapless fourfold-degenarate nodal lines protected by $6_{3}$ screw rotations and glide mirror planes. Therefore, Zr$_5$Pt$_3$ represents a novel, unprecedented condensed matter system to investigate the intricate interplay between superconductivity and topology.
description: 9 pages, 5 figures
New Mechanism for Strongly Bound Excitons in Gapless Two-Dimensional Structures
Creators: name: Liang, Yufeng
name: Soklaski, Ryan
name: Huang, Shouting
name: Graham, Matthew W.
name: Havener, Robin
name: Park, Jiwoong
name: Yang, Li
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Common wisdom asserts that bound excitons cannot form in high-dimensional (d>1) metallic structures because of their overwhelming screening and unavoidable resonance with nearby continuous bands. Strikingly, here we illustrate that this prevalent assumption is not quite true. A key ingredient that has been overlooked is that of viable decoherence that thwarts the formation of resonances. As an example of this general mechanism, we focus on an experimentally relevant material and predict bound excitons in twisted bilayer graphene, which is a two-dimensional gapless structure exhibiting metallic screening. The binding energies calculated by first-principles simulations are surprisingly large. The low-energy effective model reveals that these bound states are produced by a unique destructive coherence between two alike subband resonant excitons. In particular, this destructive coherent effect is not sensitive to the screening and dimensionality, and hence may persist as a general mechanism for creating bound excitons in various metallic structures, opening the door for excitonic applications based on metallic structures.
description: 12 pages and 5 figures
Micromagnetic modeling of magnon coherent states in a nonuniform magnetic field
Creators: name: Belanovsky, A. D.
name: Bunkov, Yu. M.
name: Vetoshko, P. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The study of the dynamics of magnetically ordered states in strong excitation through micromagnetic modeling has become relevant due to the observation of magnon Bose condensation. In particular, the question has arisen about the possibility of describing the coherent quantum state by the quasi-classical Landau-Lifshitz-Gilbert equations. We performed micromagnetic simulations of magnetization precession with a high angle of deviation in an out-of-plane nonuniform dc field. Our results confirm the formation of coherent magnon state under conditions of high excitation. This coherent state extends over long distances and described by a spatially inhomogeneous amplitude and a homogeneous precession phase.
The princess and the goblin
Creators: name: MacDonald, George, 1824-1905
Publisher: name: University of Victoria Libraries
Year: 2021
Subjects: subject: Princesses
valueUri: http://id.worldcat.org/fast/1076505
subject: Goblins
valueUri: http://id.worldcat.org/fast/944030
subject: Fairy tales
valueUri: http://id.worldcat.org/fast/919916
subject: Friendship
valueUri: http://id.worldcat.org/fast/935174

description: A little princess is protected by her friend Curdie from the goblin miners who live beneath the castle. Illustrations by Jessie Wilcox Smith and especially engraved and printed by the Beck Engraving Company, Philadelphia.
Fatou theorem and its converse for positive eigenfunctions of the Laplace-Beltrami operator on Harmonic $NA$ groups
Creators: name: Ray, Swagato K.
name: Sarkar, Jayanta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: Primary 43A80, 31B25, 35R03, Secondary 28A15, 44A35

description: We prove a Fatou-type theorem and its converse for certain positive eigenfunctions of the Laplace-Beltrami operator $\mathcal{L}$ on a Harmonic $NA$ group. We show that a positive eigenfunction $u$ of $\mathcal{L}$ with eigenvalue $β^2-ρ^2$, $β\in (0,\infty)$, has an admissible limit in the sense of Korányi, precisely at those boundary points where the strong derivative of the boundary measure of $u$ exists. Moreover, the admissible limit and the strong derivative are the same. This extends a result of Ramey and Ullrich regarding nontangential convergence of positive harmonic functions on the Euclidean upper half space.
description: 28 pages, minor corrections have made
Detection of a Majorana-fermion zero mode by a T-shaped quantum-dot structure
Creators: name: Gong, Wei-Jiang
name: Zhang, Shu-Feng
name: Li, Zhi-Chao
name: Yi, Guangyu
name: Zheng, Yi-Song
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electron transport through the T-shaped quantum-dot (QD) structure is theoretically investigated, by considering a Majorana zero mode coupled to the terminal QD. It is found that in the double-QD case, the presence of the Majorana zero mode can efficiently dissolve the antiresonance point in the conductance spectrum and induce a conductance peak to appear at the same energy position whose value is equal to $e^2/2h$. This antiresonance-resonance change will be suitable to detect the Majorana bound states. Next in the multi-QD case, we observe that in the zero-bias limit, the conductances are always the same as the double-QD result, independent of the parity of the QD number. We believe that all these results can be helpful for understanding the properties of Majorana bound states.
Brachytarsina amboinensis Rondani 1878
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Hippoboscidae
Brachytarsina
Brachytarsina amboinensis

description: Brachytarsina amboinensis Rondani, 1878
ORIGINAL DESCRIPTION: 1878a: 166.
TYPE LOCALITY: “ in Amboina [on Ambon Island (= Maluku Islands)]”.
TYPE MATERIAL: 1 ♀, holotype (MSNG): Amboina 1873, O. Beccari / Typus / Brachytarsina amboinensis Rnd. / amboinensis Rndn. / Brachytarsina amboinensis Rndn., Typus!
CURRENT STATUS: valid species (Maa 1977c: 433).
REMARKS: Rondani (1878a: 166) described Brachytarsina amboinensis from a single specimen without specifying its sex: “ Specimen unicum observavi [I observed a single specimen]”, collected by O. Beccari. Guiglia (1957: 194) and Raineri & Rey (1996: 51) reported the holotype (♀) in the MSNG.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 119, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Kalb-Ramond scalar QED multiple vacua
Creators: name: Smailagic, Anais
name: Spallucci, Euro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a model of interacting vector and Kalb-Ramond gauge fields in a non-trivial Higgs vacuum generated by a charged and a neutral scalar field. The system admits different vacua for different v.e.v. of the two Higgs fields. Our primary interest in this paper regards the "mixed phase" where both the photon and the Kalb-Ramond acquire a mass. In this phase we compute the interaction potential energy between static test charges. It turns out that the limit in which the photon becomes massless, while the Kalb-Ramond remains massive, leads to a Cornell confining potential between test charges.
description: 12 pages; three figures; paper accepted for publication in Jour. of Phys.G
Dispersion in the large-deviation regime. Part I: shear flows and periodic flows
Creators: name: Haynes, P. H.
name: Vanneste, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The dispersion of a passive scalar in a fluid through the combined action of advection and molecular diffusion is often described as a diffusive process, with an effective diffusivity that is enhanced compared to the molecular value. However, this description fails to capture the tails of the scalar concentration distribution in initial-value problems. To remedy this, we develop a large-deviation theory of scalar dispersion that provides an approximation to the scalar concentration valid at much larger distances away from the centre of mass, specifically distances that are $O(t)$ rather than $O(t^{1/2})$, where $t \gg 1$ is the time from the scalar release. The theory centres on the calculation of a rate function obtained by solving a one-parameter family of eigenvalue problems which we derive using two alternative approaches, one asymptotic, the other probabilistic. We emphasise the connection between large deviations and homogenisation: a perturbative solution of the eigenvalue problems reduces at leading order to the cell problem of homogenisation theory. We consider two classes of flows in some detail: shear flows and cellular flows. In both cases, large deviation generalises classical results on effective diffusivity and captures new phenomena relevant to the tails of the scalar distribution. These include approximately finite dispersion speeds arising at large Péclet number $\mathrm{Pe}$ (corresponding to small molecular diffusivity) and, for two-dimensional cellular flows, anisotropic dispersion. Explicit asymptotic results are obtained for shear flows in the limit of large $\mathrm{Pe}$. (A companion paper, Part II, is devoted to the large-$\mathrm{Pe}$ asymptotic treatment of cellular flows.) The predictions of large-deviation theory are compared with Monte Carlo simulations that estimate the tails of concentration accurately using importance sampling.
description: Accepted for publication in the Journal of Fluid Mechanics
Sapromyza affra Rondani 1863
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Lauxaniidae
Sapromyza
Sapromyza affra

description: Sapromyza affra Rondani, 1863
ORIGINAL DESCRIPTION: 1863: 36.
TYPE LOCALITY: “ Cap. B. Spei [Cape of Good Hope (South Africa)]”.
TYPE MATERIAL: 1 ♀, syntype (very moldy) (MZUN: Box Antomidei A 02, 01): Polinomia afra [sic!] Rnd., C. B. Sp. [= Caput Bonae Spei (Cape of Good Hope)] / M. Zool. N° 11425.
CURRENT STATUS: valid species (Miller 1980: 607).
REMARKS: Rondani (1863: 36) described Sapromyza affra from just the female sex, without specifying the exact number of specimens, but giving a single measurement of length, from material received from M. Spinola. Costa (1866: 34) listed a single MZUN specimen numbered “725”. We also found one syntype in this study.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 130, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Combinatorial necessary conditions for regular graphs to induce periodic quantum walks
Creators: name: Kubota, Sho
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 05C50, 81Q99, 05C20

description: We derive combinatorial necessary conditions for discrete-time quantum walks defined by regular mixed graphs to be periodic. If the quantum walk is periodic, all the eigenvalues of the time evolution matrices must be algebraic integers. Focusing on this, we explore which ring the coefficients of the characteristic polynomials should belong to. On the other hand, the coefficients of the characteristic polynomials of $η$-Hermitian adjacency matrices have combinatorial implications. From these, we can find combinatorial implications in the coefficients of the characteristic polynomials of the time evolution matrices, and thus derive combinatorial necessary conditions for mixed graphs to be periodic. For example, if a $k$-regular mixed graph with $n$ vertices is periodic, then $2n/k$ must be an integer. As an application of this work, we determine periodicity of mixed complete graphs and mixed graphs with a prime number of vertices.
description: 20 pages, 5 tables. The revised version adds Section 6 and beyond. Further discussion on strongly regular graphs and several well-known families of distance regular graphs is provided
title: Температурная зависимость удельного вращения плоскости поляризации для водного раствора сахара
title: Temperature Dependence of the Specific Rotation of Sugar Solution
Creators: name: Заводовский, Александр Геннадьевич
Publisher: name: Издательский центр СурГУ
Year: 2022

description: Влияние температуры на вращательную способность оптически активных веществ при использовании источников света с разной длиной волны определяется для каждого случая опытным путем. В основном имеются данные для λ = 589,3 нм. В настоящей работе определена температурная зависимость удельного вращения водного раствора сахара при использовании He-Ne лазера с длиной волны λ = 632,8 нм. Исследования выполнялись в интервале температур 20–80 °С для раз-личной концентрации раствора. Полученная зависимость является линейной с угловым коэффициентом 0,043 град℃. С увеличением температуры значение удельного вращения слабо уменьшается.
description: The temperature effect on the rotatory power of optically active substances when using light sources with different wavelengths is determined experimentally for each case. The commonly known data is provided for λ = 589.3 nm. The article determines the temperature dependence of the specific rotation of sugar solution when using a He-Ne laser with a wavelength of λ = 632.8 nm. The experiments are carried out at the temperature range of 20–80 °C for various solution concentrations. The recorded dependence is linear with an angular coefficient of 0.043 degrees℃. As the temperature increases, the value of the specific rotation decreases slightly.
Sapromyza albifrons Rondani 1868
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Lauxaniidae
Sapromyza
Sapromyza albifrons

description: Sapromyza albifrons Rondani, 1868
ORIGINAL DESCRIPTION: 1868c: 238 (key), 247 (description).
TYPE LOCALITY: “ in Pedemontio [Piedmont (Italy)]”.
TYPE MATERIAL: 1 ♂, syntype (MRSN): 7 66 / 835 / Sapromyza Fall. albifrons Bell., Torino [Turin (Piedmont)].
CURRENT STATUS: Papp (1984a) did not list it; junior primary homonym of Sapromyza albifrons Macquart, 1835 (Evenhuis & Pape 2020).
REMARKS: Rondani (1868c: 247) described Sapromyza albifrons, without specifying the number, the sex or the length of the specimens, from material received from L. Bellardi, to whom he attributed the species name. We found one syntype in this study.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 130, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Experimental characterization of an uniaxial angle cut whispering gallery mode resonator
Creators: name: Sedlmeir, Florian
name: Hauer, Martin
name: Fürst, Josef U.
name: Leuchs, Gerd
name: Schwefel, Harald G. L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The usual configuration of uniaxial whispering gallery mode resonators is a disk shaped geometry where the optic axis points along the symmetry axis, a so called z-cut resonator. Recently x-cut resonators, where the optic axis lies in the equatorial plane, became of interest as they enable extremely broadband second harmonic generation. In this paper we report on the properties of a more generalized system, the so called angle-cut resonator, where the optic axis exhibits an arbitrary angle against the symmetry axis. We show experimentally that the modal structure and quality factors are similar to common resonators but that the polarization properties differ quite significantly: due to the asymmetry the polarization depends on the equatorial position and is, in general, elliptical.
Predicting Stellar Angular Sizes
Creators: name: von Braun, Kaspar
name: Boyajian, Tabetha S.
name: van Belle, Gerard T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Our survey of long-baseline infrared and optical interferometry measurements is producing considerable numbers of directly determined stellar angular sizes. We use our sample of 124 high-precision (5\%) angular stellar diameter values and correlate them with stellar magnitude values from the literature to produce empirical relations for main-sequence stars between observed apparent magnitudes, stellar colors, and angular sizes (surface brightness relations). We find a significant dependence on stellar metallicity for ($B-V$) colors. The scatter in the calculated relations is small ($\sim$5\%), which makes them a robust tool for the prediction of main-sequence stellar angular sizes based on photometry. We apply these relations via the calculation of the radius of the multiplanet host star GJ 667C.
description: 2 pages; to appear in the EAS Publications Series "Setting a New Standard in the Analysis of Binary Stars", Leuven, Belgium 2013
Uniform convergence of wavelet expansions of Gaussian random processes
Creators: name: Kozachenko, Yuriy
name: Olenko, Andriy
name: Polosmak, Olga
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G10, 60G15, 42C40

description: New results on uniform convergence in probability for the most general classes of wavelet expansions of stationary Gaussian random processes are given.
description: 16 pages. This is an Author's Accepted Manuscript of an article published in the Stochastic Analysis and Applications, 2011, Vol. 29, No. 2, 169--184. [copyright Taylor & Francis], available online at: http://www.tandfonline.com/ [DOI:10.1080/07362994.2011.532034]
Dispersion in the large-deviation regime. Part II: cellular flow at large Péclet number
Creators: name: Haynes, P. H.
name: Vanneste, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A standard model for the study of scalar dispersion through advection and molecular diffusion is a two-dimensional periodic flow with closed streamlines inside periodic cells. Over long time scales, the dispersion of a scalar in this flow can be characterised by an effective diffusivity that is a factor $\mathrm{Pe}^{1/2}$ larger than molecular diffusivity when the Péclet number $\mathrm{Pe}$ is large. Here we provide a more complete description of dispersion in this regime by applying the large-deviation theory developed in Part I of this paper. We derive approximations to the rate function governing the scalar concentration at large time $t$ by carrying out an asymptotic analysis of the relevant family of eigenvalue problems. We identify two asymptotic regimes and make predictions for the rate function and spatial structure of the scalar. Regime I applies to distances from the release point that satisfy $|\boldsymbol{x}| = O(\mathrm{Pe}^{1/4} t)$ . The concentration in this regime is isotropic at large scales, is uniform along streamlines within each cell, and varies rapidly in boundary layers surrounding the separatrices between adjacent cells. The results of homogenisation theory are recovered from our analysis. Regime II applies when $|\boldsymbol{x}|=O(\mathrm{Pe} \, t/\log \mathrm{Pe})$ and is characterised by an anisotropic concentration distribution that is localised around the separatrices. A novel feature of this regime is the crucial role played by the dynamics near the hyperbolic stagnation points. A consequence is that in part of the regime the dispersion can be interpreted as resulting from a random walk on the lattice of stagnation points. The two regimes overlap so that our asymptotic results describe the scalar concentration over a large range of distances. They are verified against numerical solutions of the family of eigenvalue problems yielding the rate function.
description: Accepted for publication in the Journal of Fluid Mechanics
Learning a performance metric of Buchberger's algorithm
Creators: name: Mojsilović, Jelena
name: Peifer, Dylan
name: Petrović, Sonja
Publisher: name: arXiv
Year: 2021
Subjects: subject: Commutative Algebra (math.AC)
subject: Machine Learning (cs.LG)
subject: Symbolic Computation (cs.SC)
subject: Algebraic Geometry (math.AG)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: What can be (machine) learned about the complexity of Buchberger's algorithm? Given a system of polynomials, Buchberger's algorithm computes a Gröbner basis of the ideal these polynomials generate using an iterative procedure based on multivariate long division. The runtime of each step of the algorithm is typically dominated by a series of polynomial additions, and the total number of these additions is a hardware independent performance metric that is often used to evaluate and optimize various implementation choices. In this work we attempt to predict, using just the starting input, the number of polynomial additions that take place during one run of Buchberger's algorithm. Good predictions are useful for quickly estimating difficulty and understanding what features make Gröbner basis computation hard. Our features and methods could also be used for value models in the reinforcement learning approach to optimize Buchberger's algorithm introduced in [Peifer, Stillman, and Halpern-Leistner, 2020]. We show that a multiple linear regression model built from a set of easy-to-compute ideal generator statistics can predict the number of polynomial additions somewhat well, better than an uninformed model, and better than regression models built on some intuitive commutative algebra invariants that are more difficult to compute. We also train a simple recursive neural network that outperforms these linear models. Our work serves as a proof of concept, demonstrating that predicting the number of polynomial additions in Buchberger's algorithm is a feasible problem from the point of view of machine learning.
Birkhoff Averages and the Breakdown of Invariant Tori in Volume-Preserving Maps
Creators: name: Meiss, J. D.
name: Sander, E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, we develop numerical methods based on the weighted Birkhoff average for studying two-dimensional invariant tori for volume-preserving maps. The methods do not rely on symmetries, such as time-reversal symmetry, nor on approximating tori by periodic orbits. The rate of convergence of the average gives a sharp distinction between chaotic and regular dynamics and allows accurate computation of rotation vectors for regular orbits. Resonant and rotational tori are distinguished by computing the resonance order of the rotation vector to a given precision. Critical parameter values, where tori are destroyed, are computed by a sharp decrease in convergence rate of the Birkhoff average. We apply these methods for a three-dimensional generalization of Chirikov's standard map: an angle-action map with two angle variables. Computations on grids in frequency and perturbation amplitude allow estimates of the critical set. We also use continuation to follow tori with fixed rotation vectors. We test three conjectures for cubic fields that have been proposed to give locally robust invariant tori.
description: 37 pages and 19 figures
The properties of cross-correlation and spectra of the low-mass X-ray binary 4U 1608-52
Creators: name: Lei, Ya-Juan
name: Zhang, Shu
name: Qu, Jin-Lu
name: Zhang, Hao-Tong
name: Li, Zhi-Bing
name: Zhang, Cheng-Min
name: Zhao, Yong-Heng
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: With {\it RXTE} data, we analyzed the cross-correlation function between the soft and hard X-rays of the transient atoll source 4U 1608-52. We found anti-correlations in three outbursts occurred in 1998, 2002 and 2010, and significant time lags of several hundreds of seconds in the latter two outbursts. Our results show no correlation between the soft and hard X-rays in the island state, and a dominated positive correlation in the lower banana state. Anti-correlations are presented at the upper banana state for the outburst of 2010 and at the lower left banana states for the other two outbursts. So far for atoll sources the cross-correlation has been studied statistically only for 4U 1735-44, where anti-correlations showed up in the upper banana state. Here our investigation upon 4U 1608-52 provides a similar result in its 2010 outburst. In addition, we notice that the luminosities in the upper banana of 1998 and 2002 outbursts are about 1.5 times that of 2010 outburst whose luminosity in the upper banana is close to that of 4U 1735-44. The results suggest that the states in color-color diagram of a source could be correlated with the luminosity of the source. A further spectral analysis shows that, during the 2010 outburst, although an anti-correlation presents at the highest fluxes, the contemporary spectrum is not the softest one along the outburst evolution. This suggests that the observed anti-correlation may be relevant to the transition between the hard and soft states, which is consistent with the previous results on 4U 1735-44 and several black hole X-ray binaries that anti-correlations are observed during the transition states.
description: 22 pages, 4 figures
title: Fünf Heilsame Trost-Brünnen; [ca. 1680]
title: So Nach einem jeden Gesätzlein Deß Schmertzhafften Rosenkrantzes, Für die Lebendige vnd Todte, sonders aber Zu Trost vnd Erquickung Der Noth-leidenden Seelen im Fegfeur, Betrachtungs-weis täglich zu eröffnen: Sambt beygefügtem heilsamestem Brunnen-Quell Der Allerheiligisten Seiten Christi
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2015

description: Kein Erscheinungsjahr ermittelbar (Simon Utzschneider war als Drucker 1663-1689 in Augsburg tätig. - Quelle: CERL Thesaurus)
On the equivariant stability of harmonic self-maps of cohomogeneity one manifolds
Creators: name: Branding, Volker
name: Siffert, Anna
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: The systematic study of harmonic self-maps on cohomogeneity one manifolds has recently been initiated by Püttmann and the second named author in \cite{MR4000241}. In this article we investigate the corresponding Jacobi equation describing the equivariant stability of such harmonic self-maps. Besides several general statements concerning their equivariant stability we explicitly solve the Jacobi equation for some harmonic self-maps in the cases of spheres, special orthogonal groups and $\SU(3)$. In particular, we show by an explicit calculation that for specific cohomogeneity one actions on the sphere the identity map is equivariantly stable.
Sapromyza bisigillata Rondani 1868
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Lauxaniidae
Sapromyza
Sapromyza bisigillata

description: Sapromyza bisigillata Rondani, 1868
ORIGINAL DESCRIPTION: 1868c: 239 (key), 250 (description).
TYPE LOCALITY: “ in Pedemontio [Piedmont (Italy)]”.
TYPE MATERIAL: 1 ♀, syntype (MRSN): 816 / [illegible word] / Sapromyza Fall. bisigillata Bell., Stura [= Stura Valley (Piedmont)]; 1 ♀, syntype (MRSN): Sapromyza Fall. bisigillata Bell., Stura [= Stura Valley (Piedmont)].
CURRENT STATUS: valid species (Papp 1984a: 213).
REMARKS: Rondani (1868c: 250) described Sapromyza bisigillata from just the female sex without specifying either the number or the length of the specimens: “ Rarissimo lecta foemina [The female collected rarely]” received from L. Bellardi, to whom he attributed the species name. Rondani (1868c: 250) erroneously listed this nominal species as a male but explicitly referred to a female in the description. We found two female syntypes in this study.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 131, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Anti-Integrability for 3-Dimensional Quadratic Maps
Creators: name: Hampton, Amanda E
name: Meiss, James D
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37C05, 37D45, 39A33

description: We study the dynamics of the three-dimensional quadratic diffeomorphism using a concept first introduced thirty years ago for the Frenkel-Kontorova model of condensed matter physics: the anti-integrable (AI) limit. At the traditional AI limit, orbits of a map degenerate to sequences of symbols and the dynamics is reduced to the shift operator, a pure form of chaos. Under nondegeneracy conditions, a contraction mapping argument can show that infinitely many AI states continue to orbits of the deterministic map. For the 3D quadratic map, the AI limit that we study is a quadratic correspondence whose branches, a pair of one-dimensional maps, introduce symbolic dynamics on two symbols. The AI states, however, are nontrivial orbits of this correspondence. The character of these orbits depends on whether the quadratic takes the form of an ellipse, a hyperbola, or a pair of lines. Using contraction arguments, we find parameter domains for each case such that each symbol sequence corresponds to a unique AI state. In some parameter domains, sufficient conditions are then found for each such AI state to continue away from the limit to become an orbit of the original 3D map. Numerical continuation methods extend these results, allowing computation of bifurcations and obtaining orbits with horseshoe-like structures and intriguing self-similarity. We conjecture that pairs of periodic orbits in saddle-node or period doubling bifurcations have symbol sequences that differ in exactly one position.
description: 28 pages, 34 figures
Vortragsfolien PUNCH4NFDI - Particles, Universe, NuClei and Hadrons for the NFDI
Creators: name: Steinmetz, Matthias
Publisher: name: Zenodo
Year: 2020
Subjects: NFDI

description: Das PUNCH4NFDI-Konsortium vereinigt die Initiativen Astro@NFDI und PAHN-PaN. PUNCH4NFDI adressiert die Forschungsgebiete der Teilchen-, Astro-, Astroteilchen-, Kern- und Hadronenphysik - also große Teile der fundamentalen Physik aller Längen-, Energie- und Zeitskalen. Diesen Gebieten der erkenntnisorientierten Physik ist zu eigen, dass sie oft große, internationale Infrastrukturen nutzen und betreiben. Mit seinen jahrzehntelangen und umfassenden Erfahrungen im Bereich “big data” und “open data” kombiniert PUNCH4NFDI die Stärken der beiden Initiativen in optimaler Art und Weise. PUNCH4NFDI basiert auf umfassender Expertise in Gebieten, die für eine erfolgreiche NFDI grundlegend sind und kann zahlreiche Angebote für andere Fachgebiete liefern, bei denen ein ausgefeiltes Datenmanagement bisher von geringerer Bedeutung war.
Tunable non-Gaussian resources for continuous-variable quantum technologies
Creators: name: Dell'Anno, F.
name: Buono, D.
name: Nocerino, G.
name: Porzio, A.
name: Solimeno, S.
name: De Siena, S.
name: Illuminati, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We introduce and discuss a set of tunable two-mode states of continuous-variable systems, as well as an efficient scheme for their experimental generation. This novel class of tunable entangled resources is defined by a general ansatz depending on two experimentally adjustable parameters. It is very ample and flexible as it encompasses Gaussian as well as non-Gaussian states. The latter include, among others, known states such as squeezed number states and de-Gaussified photon-added and photon-subtracted squeezed states, the latter being the most efficient non-Gaussian resources currently available in the laboratory. Moreover, it contains the classes of squeezed Bell states and even more general non-Gaussian resources that can be optimized according to the specific quantum technological task that needs to be realized. The proposed experimental scheme exploits linear optical operations and photon detections performed on a pair of uncorrelated two--mode Gaussian squeezed states. The desired non-Gaussian state is then realized via ancillary squeezing and conditioning. Two independent, freely tunable experimental parameters can be exploited to generate different states and to optimize the performance in implementing a given quantum protocol. As a concrete instance, we analyze in detail the performance of different states considered as resources for the realization of quantum teleportation in realistic conditions. For the fidelity of teleportation of an unknown coherent state, we show that the resources associated to the optimized parameters outperform, in a significant range of experimental values, both Gaussian twin beams and photon-subtracted squeezed states.
description: 13 pages, 7 figures
Unravelling the phonon scattering mechanism in Half-Heusler alloys ZrCo1-xIrxSb (x = 0, 0.1, and 0.25)
Creators: name: Yadav, Kavita
name: Singh, Saurabh
name: Muthuswamy, Omprakash
name: Takeuchi, Tsunehiro
name: Mukherjee, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Insight about the scattering mechanisms responsible for reduction in the lattice thermal conductivity (\k{appa}L) in Half-Heusler alloys (HHA) is imperative. In this context, we have thoroughly investigated the temperature response of thermal conductivity of ZrCo1-xIrxSb (x = 0, 0.1 and 0.25). For ZrCoSb, \k{appa}L is found to be ~15.13 W/m-K at 300 K, which is drastically reduced to ~4.37 W/m-K in ZrCo0.9Ir0.1Sb. This observed reduction is ascribed to softening of acoustic phonon modes and point defect scattering, on substitution of heavier mass. However, no further reduction in \k{appa}L is observed in ZrCo0.75Ir0.25Sb, because of identical scattering parameter. This has been elucidated based on the Klemens Callaway model. Also, in the parent alloy, phonon-phonon scattering mechanism plays a significant role in heat conduction process, whereas in Ir substituted alloys, point defect scattering (below 500 K) and phonon-phonon scattering (above 750 K) are the dominant scattering mechanisms. The minimum \k{appa}L is found to be ~1.73 W/m-K (at 950 K) in ZrCo0.9Ir0.1Sb, which is the lowest reported value till now, for n-type Zr based HHA. Our studies indicate that partial substitution of heavier mass element Ir at Co-site effectively reduces the \k{appa}L of n-type ZrCoSb, without modifying the nature of charge carriers.
SN 2009N: Linking normal and subluminous type II-P SNe
Creators: name: Takáts, K.
name: Pumo, M. L.
name: Elias-Rosa, N.
name: Pastorello, A.
name: Pignata, G.
name: Paillas, E.
name: Zampieri, L.
name: Anderson, J. P.
name: Vinkó, J.
name: Benetti, S.
name: Botticella, M-T.
name: Bufano, F.
name: Campillay, A.
name: Cartier, R.
name: Ergon, M.
name: Folatelli, G.
name: Foley, R. J.
name: Förster, F.
name: Hamuy, M.
name: Hentunen, V-P.
name: Kankare, E.
name: Leloudas, G.
name: Morrell, N.
name: Nissinen, M.
name: Phillips, M. M.
name: Smartt, S. J.
name: Stritzinger, M.
name: Taubenberger, S.
name: Valenti, S.
name: Van Dyk, S. D.
name: Haislip, J. B.
name: LaCluyze, A. P.
name: Moore, J. P.
name: Reichart, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present ultraviolet, optical, near-infrared photometry and spectroscopy of SN 2009N in NGC 4487. This object is a type II-P supernova with spectra resembling those of subluminous II-P supernovae, while its bolometric luminosity is similar to that of the intermediate luminosity SN 2008in. We created SYNOW models of the plateau phase spectra for line identification and to measure the expansion velocity. In the near-infrared spectra we find signs indicating possible weak interaction between the supernova ejecta and the pre-existing circumstellar material. These signs are also present in the previously unpublished near-infrared spectra of SN 2008in. The distance to SN 2009N is determined via the expanding photosphere method and the standard candle method as $D= 21.6 \pm 1.1\,{\mathrm {Mpc}}$. The produced nickel-mass is estimated to be $\sim 0.020 \pm 0.004\,{\mathrm M_\odot}$. We infer the physical properties of the progenitor at the explosion through hydrodynamical modelling of the observables. We find the values of the total energy as $\sim 0.48 \times 10^{51}\, {\mathrm {erg}}$, the ejected mass as $\sim 11.5\,{\mathrm M_\odot}$, and the initial radius as $\sim 287\,{\mathrm R_\odot}$.
description: 23 pages, 18 figures, accepted for publication by MNRAS
Unifying and benchmarking state-of-the-art quantum error mitigation techniques
Creators: name: Bultrini, Daniel
name: Gordon, Max Hunter
name: Czarnik, Piotr
name: Arrasmith, Andrew
name: Cerezo, M.
name: Coles, Patrick J.
name: Cincio, Lukasz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Error mitigation is an essential component of achieving a practical quantum advantage in the near term, and a number of different approaches have been proposed. In this work, we recognize that many state-of-the-art error mitigation methods share a common feature: they are data-driven, employing classical data obtained from runs of different quantum circuits. For example, Zero-noise extrapolation (ZNE) uses variable noise data and Clifford-data regression (CDR) uses data from near-Clifford circuits. We show that Virtual Distillation (VD) can be viewed in a similar manner by considering classical data produced from different numbers of state preparations. Observing this fact allows us to unify these three methods under a general data-driven error mitigation framework that we call UNIfied Technique for Error mitigation with Data (UNITED). In certain situations, we find that our UNITED method can outperform the individual methods (i.e., the whole is better than the individual parts). Specifically, we employ a realistic noise model obtained from a trapped ion quantum computer to benchmark UNITED, as well as other state-of-the-art methods, in mitigating observables produced from random quantum circuits and the Quantum Alternating Operator Ansatz (QAOA) applied to Max-Cut problems with various numbers of qubits, circuit depths and total numbers of shots. We find that the performance of different techniques depends strongly on shot budgets, with more powerful methods requiring more shots for optimal performance. For our largest considered shot budget ($10^{10}$), we find that UNITED gives the most accurate mitigation. Hence, our work represents a benchmarking of current error mitigation methods and provides a guide for the regimes when certain methods are most useful.
description: 25 pages, 11 figures, extended theoretical and numerical results, accepted by Quantum
Normal Forms and Near-Axis Expansions for Beltrami Magnetic Fields
Creators: name: Duignan, Nathan
name: Meiss, James D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A formal series transformation to Birkhoff-Gustavson normal form is obtained for toroidal magnetic field configurations in the neighborhood of a magnetic axis. Bishop's rotation-minimizing coordinates are used to obtain a local orthogonal frame near the axis in which the metric is diagonal, even if the curvature has zeros. We treat the cases of vacuum and force-free (Beltrami) fields in a unified way, noting that the vector potential is essentially the Poincaré-Liouville one-form of Hamiltonian dynamics, and the resulting magnetic field corresponds to the canonical two-form of a nonautonomous one-degree-of-freedom system. Canonical coordinates are obtained and Floquet theory is used to transform to a frame in which the lowest-order Hamiltonian is autonomous. The resulting magnetic axis can be elliptic or hyperbolic, and resonant elliptic cases are treated. The resulting expansion for the field is shown to be well-defined to all orders, and is explicitly computed to degree four. An example is given for an axis with constant torsion near a 1:3 resonance.
description: 31 pages, 5 figures
Resilient Flow Decomposition of Unicast Connections with Network Coding
Creators: name: Babarczi, Peter
name: Tapolcai, Janos
name: Ronyai, Lajos
name: Medard, Muriel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper we close the gap between end-to-end diversity coding and intra-session network coding for unicast connections resilient against single link failures. In particular, we show that coding operations are sufficient to perform at the source and receiver if the user data can be split into at most two parts over the filed GF(2). Our proof is purely combinatorial and based on standard graph and network flow techniques. It is a linear time construction that defines the route of subflows A, B and A+B between the source and destination nodes. The proposed resilient flow decomposition method generalizes the 1+1 protection and the end-to-end diversity coding approaches while keeping both of their benefits. It provides a simple yet resource efficient protection method feasible in 2-connected backbone topologies. Since the core switches do not need to be modified, this result can bring benefits to current transport networks.
description: submitted to IEEE International Symposium on Information Theory (ISIT) 2014
Manifesto da IFLA/UNESCO sobre Bibliotecas Públicas
Creators: name: IFLA; UNESCO
Publisher: name: Zenodo
Year: 2020
Subjects: Bibliotecas Públicas
IFLA
UNESCO
Public Libraries
Guidelines
Diretrizes

description: Manifesto publicado em 1994 pela IFLA/UNESCO, contendo os princípios orientadores para a missão das bibliotecas públicas.
Relaxation of Multitime Statistics in Quantum Systems
Creators: name: Dowling, Neil
name: Figueroa-Romero, Pedro
name: Pollock, Felix A.
name: Strasberg, Philipp
name: Modi, Kavan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Equilibrium statistical mechanics provides powerful tools to understand physics at the macroscale. Yet, the question remains how this can be justified based on a microscopic quantum description. Here, we extend the ideas of pure state quantum statistical mechanics, which focus on single time statistics, to show the equilibration of isolated quantum processes. Namely, we show that most multitime observables for sufficiently large times cannot distinguish a nonequilibrium process from an equilibrium one, unless the system is probed for an extremely large number of times or the observable is particularly fine-grained. A corollary of our results is that the size of non-Markovianity and other multitime characteristics of a nonequilibrium process also equilibrate.
description: 7+13 pages, 2+2 figures
Archiving the Relaxed Consistency Web
Creators: name: Xie, Zhiwu
name: Van de Sompel, Herbert
name: Liu, Jinyang
name: van Reenen, Johann
name: Jordan, Ramiro
Publisher: name: arXiv
Year: 2013
Subjects: subject: Digital Libraries (cs.DL)
subject: Databases (cs.DB)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences
subject: H.3.5; H.3.7; H.2.4

description: The historical, cultural, and intellectual importance of archiving the web has been widely recognized. Today, all countries with high Internet penetration rate have established high-profile archiving initiatives to crawl and archive the fast-disappearing web content for long-term use. As web technologies evolve, established web archiving techniques face challenges. This paper focuses on the potential impact of the relaxed consistency web design on crawler driven web archiving. Relaxed consistent websites may disseminate, albeit ephemerally, inaccurate and even contradictory information. If captured and preserved in the web archives as historical records, such information will degrade the overall archival quality. To assess the extent of such quality degradation, we build a simplified feed-following application and simulate its operation with synthetic workloads. The results indicate that a non-trivial portion of a relaxed consistency web archive may contain observable inconsistency, and the inconsistency window may extend significantly longer than that observed at the data store. We discuss the nature of such quality degradation and propose a few possible remedies.
description: 10 pages, 6 figures, CIKM 2013
Erzählungen und dramatisch bearbeitete Scenen zur Unterhaltung für Freunde romantischer Lektüre; 1800
Creators: name: Goldstein, Augusta von
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2015

description: In Fraktur. - Verf. ermittelt. - Enth.: Ludwig von der Leue. Laura de Vastella. Stolz und Liebe. Astolpho