cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Incoherent pion photoproduction on the deuteron in the first resonance region
Creators: name: Levchuk, M. I.
name: Loginov, A. Yu.
name: Sidorov, A. A.
name: Stibunov, V. N.
name: Schumacher, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Incoherent pion photoproduction on the deuteron is studied in the first resonance region. The unpolarized cross section, the beam asymmetry, and the vector and tensor target asymmetries are calculated in the framework of a diagrammatic approach. Pole diagrams and one-loop diagrams with $NN$ scattering in the final state are taken into account. An elementary operator for pion photoproduction on the nucleon is taken in various on-shell forms and calculated using the SAID and MAID multipole analyses. Model dependence of the obtained results is discussed in some detail. A comparison with predictions of other works is given. Although a reasonable description of many available experimental data on the unpolarized total and differential cross sections and photon asymmetry has been achieved, in some cases a significant disagreement between the theory and experiment has been found. Invoking known information on the reactions $γd\toπ^0 d$ and $γd\to np$ we predict the total photoabsorption cross section for deuterium. We find that our values strongly overestimate experimental data in the vicinity of the $Δ$ peak.
description: 22 pages, 23 figures
Didattica e diffusione della lingua italiana in Camerun
Creators: name: Siebetcheu, Raymond
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2013

description:

In Cameroon, Italian is increasingly taught in universities, schools and language centres. The main reasons for learning Italian are of a practical order rather than a cultural one, as a means for a better future or professional achievements. Italianisms are widespread in the country, on shop signs and posters and so on, mainly with reference with food, fashion and also sport. Much of the fascination of Italian language lies in its novelty compared to more common foreign languages like English or French. A certain lack of institutional support is its greatest frailty.

description: EL.LE
Summable solutions of the Goursat problem for some partial differential equations with constant coefficients
Creators: name: Michalik, Sławomir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 35C10, 35C15, 35E15, 40G10

description: We consider the Goursat problem for linear partial differential equations with constant coefficients in two complex variables. We find the conditions for summable solutions of the Goursat problem in the case when the Newton polygon has exactly one side with a positive slope.
description: 22 pages
An Artificial Neural Network based approach for Harmonic Component Prediction in a Distribution Line
Creators: name: Sapkota, Dixant Bikal
name: Neupane, Puskar
name: Pokharel, Kajal
name: Khan, Shahabuddin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: With the increasing use of nonlinear devices in both generation and consumption of power, it is essential that we develop accurate and quick control for active filters to suppress harmonics. Time delays between input and output are catastrophic for such filters which rely on real-time operation. Artificial Neural Networks (ANNs) are capable of modeling complex nonlinear systems through adjustments in their learned parameters. Once properly trained, they can produce highly accurate predictions at an instantaneous time frame. Leveraging these qualities, various complex control systems may be replaced or aided by neural networks to provide quick and precise responses. This paper proposes an ANN-based approach for the prediction of individual harmonic components using minimal inputs. By extracting and analyzing the nature of harmonic component magnitudes obtained from the survey of a particular area through real-time measurements, a sequential pattern in their occurrence is observed. Various neural network architectures are trained using the collected data and their performances are evaluated. The best-performing model, whose losses are minimal, is then used to observe the harmonic cancellation for multiple unseen cases through a simplified simulation in hardware-in-the-loop. These neural network structures, which produce instantaneous and accurate outputs, are effective in harmonic filtering.
Quantum localization measures in phase space
Creators: name: Villaseñor, D.
name: Pilatowsky-Cameo, S.
name: Bastarrachea-Magnani, M. A.
name: Lerma-Hernández, S.
name: Hirsch, J. G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Measuring the degree of localization of quantum states in phase space is essential for the description of the dynamics and equilibration of quantum systems, but this topic is far from being understood. There is no unique way to measure localization, and individual measures can reflect different aspects of the same quantum state. Here, we present a general scheme to define localization in measure spaces, which is based on what we call Rényi occupations, from which any measure of localization can be derived. We apply this scheme to the four-dimensional unbounded phase space of the interacting spin-boson Dicke model. In particular, we make a detailed comparison of two localization measures based on the Husimi function in the regime where the model is chaotic, namely one that projects the Husimi function over the finite phase space of the spin and another that uses the Husimi function defined over classical energy shells. We elucidate the origin of their differences, showing that in unbounded spaces the definition of maximal delocalization requires a bounded reference subspace, with different selections leading to contextual answers.
description: 14 pages, 5 figures
Helmholtz and Maxwell : the significance of the Hertzian synthesis
Creators: name: Lund, Erik August
Publisher: name: University of British Columbia
Year: 2008

description: The problem of energy is a serious difficulty for modern physics arising out of the Nineteenth Century. In modern times, the concept of energy is linked both to the First Law of Thermodynamics, or the Law of Conservation of Energy, and the velocity of particles. Other usages of energy include the language of electrodynamics which locates it in space, and quantum mechanics. Despite that, its existence is in debate. The confusion is one of origins. Common perceptions, which locate the idea of energy among the by-products of the empirical law of conservation of energy are mistaken. Rather, the law of conservation of energy is First Formulated as a metaphysical statement by a generation of true natural philosophers whose most prominent spokesman was Hermann von Helmholtz. Helmholtz's Kantian Formulation of what he called "the Law of Conservation of Force" does not require energy. That idea is, rather, invented by J.C. Maxwell, in the mistaken impression that he merely employed an entity whose existence was already proven. When the Halmholtzian and Maxwellian traditions meet in the work of Heinrich Hertz, they are reconciled in such a way as to discard important elements of Maxwell's theory and leave Kantian ideas intact. The Kantian Formulation coupled with interpretations which retained the language of the Maxwell theory remain Fixed in historical hindsight as the consensus position of classical physics, and this obscures both the true origins of energy and the separate origins and progress of the First Law of Thermodynamics.
Class I methanol masers in the outflow of IRAS 16547-4247
Creators: name: Voronkov, M. A.
name: Brooks, K. J.
name: Sobolev, A. M.
name: Ellingsen, S. P.
name: Ostrovskii, A. B.
name: Caswell, J. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Australia Telescope Compact Array (ATCA) has been used to image class I methanol masers at 9.9, 25 (a series from J=2 to J=9), 84, 95 and 104 GHz located in the vicinity of IRAS 16547-4247 (G343.12-0.06), a luminous young stellar object known to harbour a radio jet. The detected maser emission consists of a cluster of 6 spots spread over an area of 30 arcsec. Five spots were detected in only the 84- and 95-GHz transitions (for two spots the 84-GHz detection is marginal), while the sixth spot shows activity in all 12 observed transitions. We report the first interferometric observations of the rare 9.9- and 104-GHz masers. It is shown that the spectra contain a very narrow spike (<0.03 km/s) and the brightness temperature in these two transitions exceeds 5.3x10^7 and 2.0x10^4 K, respectively. The three most southern maser spots show a clear association with the shocked gas traced by the H_2 2.12 micron emission associated with the radio jet and their velocities are close to that of the molecular core within which the jet is embedded. This fact supports the idea that the class I masers reside in the interface regions of outflows. Comparison with OH masers and infrared data reveals a potential discrepancy in the expected evolutionary state. The presence of the OH masers usually means that the source is evolved, but the infrared data suggest otherwise. The lack of any class II methanol maser emission at 6.7 GHz in the source raises an additional question, is this source too young or too old to have a 6.7 GHz maser? We argue that both cases are possible and suggest that the evolutionary stage where the class I masers are active, may last longer and start earlier than when the class II masers are active. However, it is currently not possible to reveal the exact evolutionary status of IRAS 16547-4247.
description: 14 pages, 6 figures, 4 tables, accepted by MNRAS
Cosmological constraints on neutrino plus axion hot dark matter: Update after WMAP-5
Creators: name: Hannestad, Steen
name: Mirizzi, Alessandro
name: Raffelt, Georg G.
name: Wong, Yvonne Y. Y.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We update our previous constraints on two-component hot dark matter (axions and neutrinos), including the recent WMAP 5-year data release. Marginalising over sum m_nu provides m_a < 1.02 eV (95% C.L.) for the axion mass. In the absence of axions we find sum m_nu < 0.63 eV (95% C.L.).
description: 4 pages, 1 figure, uses iopart.cls; v2 matches published version
Exploring theoretical uncertainties in the hydrodynamic description of relativistic heavy-ion collisions
Creators: name: Chiu, Cheng
name: Shen, Chun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We explore theoretical uncertainties in the hydrodynamic description of relativistic heavy-ion collisions by examining the full non-linear causality conditions and quantifying the second-order transport coefficients' role on flow observables. The causality conditions impose physical constraints on the maximum allowed values of inverse Reynolds numbers during the hydrodynamic evolution. Including additional second-order gradient terms in the Denicol-Niemi-Molnár-Rischke (DNMR) theory significantly shrinks the casual regions compared to those in the Israel-Stewart hydrodynamics. For Au+Au collisions, we find the variations of flow observables are small with and without imposing the necessary causality conditions, suggesting a robust extraction of the Quark-Gluon Plasma's transport coefficients in previous model-to-data comparisons. However, sizable sensitivity is present in small p+Au collisions, which poses challenges to study the small systems' collectivity.
description: 13 pages, 10 figures; Accepted by Phys. Rev. C
A Clumping Independent Diagnostic of Stellar Mass-loss Rates: Rapid Clump Destruction in Adiabatic Colliding Winds
Creators: name: Pittard, J. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Clumping in hot star winds can significantly affect estimates of mass-loss rates, the inferred evolution of the star and the environmental impact of the wind. A hydrodynamical simulation of a colliding winds binary (CWB) with clumpy winds reveals that the clumps are rapidly destroyed after passing through the confining shocks of the wind-wind collision region (WCR) for reasonable parameters of the clumps if the flow in the WCR is adiabatic. Despite large density and temperature fluctuations in the post-shock gas, the overall effect of the interaction is to smooth the existing structure in the winds. Averaged over the entire interaction region, the resulting X-ray emission is very similar to that from the collision of smooth winds. The insensitivity of the X-ray emission to clumping suggests it is an excellent diagnostic of the stellar mass-loss rates in wide CWBs, and may prove to be a useful addition to existing techniques for deriving mass-loss rates, many of which are extremely sensitive to clumping. Clumpy winds also have implications for a variety of phenomena at the WCR: particle acceleration may occur throughout the WCR due to supersonic MHD turbulence, re-acceleration at multiple shocks, and re-connection; a statistical description of the properties of the WCR may be required for studies of non-equilibrium ionization and the rate of electron heating; and the physical mixing of the two winds will be enhanced, as seems necessary to trigger dust formation.
description: 4 pages, 3 figures, accepted for publication in ApJL
TESS asteroseismology of $β$ Hydri: a subgiant with a born-again dynamo
Creators: name: Metcalfe, Travis S.
name: van Saders, Jennifer L.
name: Huber, Daniel
name: Buzasi, Derek
name: Garcia, Rafael A.
name: Stassun, Keivan G.
name: Basu, Sarbani
name: Breton, Sylvain N.
name: Claytor, Zachary R.
name: Corsaro, Enrico
name: Nielsen, Martin B.
name: Ong, J. M. Joel
name: Saunders, Nicholas
name: Stokholm, Amalie
name: Bedding, Timothy R.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The solar-type subgiant $β$ Hyi has long been studied as an old analog of the Sun. Although the rotation period has never been measured directly, it was estimated to be near 27 days. As a southern hemisphere target it was not monitored by long-term stellar activity surveys, but archival International Ultraviolet Explorer data revealed a 12 year activity cycle. Previous ground-based asteroseismology suggested that the star is slightly more massive and substantially larger and older than the Sun, so the similarity of both the rotation rate and the activity cycle period to solar values is perplexing. We use two months of precise time-series photometry from the Transiting Exoplanet Survey Satellite (TESS) to detect solar-like oscillations in $β$ Hyi and determine the fundamental stellar properties from asteroseismic modeling. We also obtain a direct measurement of the rotation period, which was previously estimated from an ultraviolet activity-rotation relation. We then use rotational evolution modeling to predict the rotation period expected from either standard spin-down or weakened magnetic braking (WMB). We conclude that the rotation period of $β$ Hyi is consistent with WMB, and that changes in stellar structure on the subgiant branch can reinvigorate the large-scale dynamo and briefly sustain magnetic activity cycles. Our results support the existence of a "born-again" dynamo in evolved subgiants -- previously suggested to explain the cycle in 94 Aqr Aa -- which can best be understood within the WMB scenario.
description: ApJ accepted. 8 pages including 6 figures and 2 tables
Suppression of magnetotransport in strongly disordered graphene
Creators: name: Ziegler, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A tight-binding model with randomly fluctuating atomic positions is studied to discuss the effect of strong disorder in graphene. We employ a strong-disorder expansion for the transport quantities and find a diffusive behavior, where the conductivity is decreasing with increasing disorder. Surprisingly, the magnetic field drops out of the transport quantities in leading order of this expansion. This signals a strong suppression of magnetotransport effects for sufficiently strong disorder. This result is consistent with recent experimental observations by Morozov {\it et al.}
description: 5 pages, 2 figures
Attention-Based Neural Networks for Chroma Intra Prediction in Video Coding
Creators: name: Górriz, Marc
name: Blasi, Saverio
name: Smeaton, Alan F.
name: O'Connor, Noel E.
name: Mrak, Marta
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computational Complexity (cs.CC)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Multimedia (cs.MM)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Neural networks can be successfully used to improve several modules of advanced video coding schemes. In particular, compression of colour components was shown to greatly benefit from usage of machine learning models, thanks to the design of appropriate attention-based architectures that allow the prediction to exploit specific samples in the reference region. However, such architectures tend to be complex and computationally intense, and may be difficult to deploy in a practical video coding pipeline. This work focuses on reducing the complexity of such methodologies, to design a set of simplified and cost-effective attention-based architectures for chroma intra-prediction. A novel size-agnostic multi-model approach is proposed to reduce the complexity of the inference process. The resulting simplified architecture is still capable of outperforming state-of-the-art methods. Moreover, a collection of simplifications is presented in this paper, to further reduce the complexity overhead of the proposed prediction architecture. Thanks to these simplifications, a reduction in the number of parameters of around 90% is achieved with respect to the original attention-based methodologies. Simplifications include a framework for reducing the overhead of the convolutional operations, a simplified cross-component processing model integrated into the original architecture, and a methodology to perform integer-precision approximations with the aim to obtain fast and hardware-aware implementations. The proposed schemes are integrated into the Versatile Video Coding (VVC) prediction pipeline, retaining compression efficiency of state-of-the-art chroma intra-prediction methods based on neural networks, while offering different directions for significantly reducing coding complexity.
Pebble-driven migration of low-mass planets in the 2D regime of pebble accretion
Creators: name: Chrenko, O.
name: Chametla, R. O.
name: Masset, F. S.
name: Baruteau, C.
name: Brož, M.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Pebbles drifting past a disk-embedded low-mass planet develop asymmetries in their distribution and exert a substantial gravitational torque on the planet, thus modifying its migration rate. Our aim is to assess how the distribution of pebbles and the resulting torque change in the presence of pebble accretion, focusing on its 2D regime. First, we performed 2D high-resolution multi-fluid simulations with Fargo3D but found that they are impractical for resolving pebble accretion due to the smoothing of the planetary gravitational potential. To remove the smoothing and directly trace pebbles accreted by the planet, we developed a new code, Deneb, which evolves an ensemble of pebbles, represented by Lagrangian superparticles, in a steady-state gaseous background. For small and moderate Stokes numbers, St $\lesssim 0.1$, pebble accretion creates two underdense regions with a front-rear asymmetry with respect to the planet. The underdensity trailing the planet is more extended. The resulting excess of pebble mass in front of the planet then makes the pebble torque positive and capable of outperforming the negative gas torque. Pebble accretion thus enables outward migration (previously thought to occur mainly for St $\gtrsim 0.1$) in a larger portion of the parameter space. It occurs for the planet mass $M_{pl}\lesssim3\,M_{\oplus}$ and for all the Stokes numbers considered in our study, St $\in$ [$10^{-2}, 0.785$], assuming a pebble-to-gas mass ratio of $Z = 0.01$. If some of the observed planets underwent outward pebble-driven migration during their accretion, the formation sites of their progenitor embryos could have differed greatly from the usual predictions of planet formation models. To enable an update of the respective models, we provide a scaling law for the pebble torque that can be readily incorporated in N-body simulations.
description: Published in A&A
On resolving the refractive index and the wave vector
Creators: name: Skaar, Johannes
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The identification of the refractive index and wave vector for general (possibly active) linear, isotropic, homogeneous, and non-spatially dispersive media is discussed. Correct conditions for negative refraction necessarily include the global properties of the permittivity and permeability functions $ε=ε(ω)$ and $μ=μ(ω)$. On the other hand, a necessary and sufficient condition for left-handedness can be identified at a single frequency ($\reε/|ε|+\reμ/|μ|<0$). At oblique incidence to semi-infinite, active media it is explained that the wave vector generally loses its usual interpretation for real frequencies.
Single transverse-spin asymmetries in forward pion production at high energy: incorporating small-x effects in the target
Creators: name: Boer, Daniel
name: Dumitru, Adrian
name: Hayashigaki, Arata
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We consider single-inclusive forward pion production in high-energy proton-proton collisions at RHIC energies. A good baseline description of the transverse momentum distributions at high rapidity is obtained within Mueller's dipole formalism with an anomalous dimension incorporating an ``extended geometric scaling'' window between the saturation and DGLAP regimes. We then formulate pion production for transversely polarized projectiles within the same approach. We assume that an azimuthal, spin-dependent asymmetry arises from the so-called Sivers effect and investigate the single transverse-spin asymmetry A_N at 200 GeV and 500 GeV center-of-mass energy. A simple parameterization of the Sivers functions from the literature compares reasonably well with the high-energy STAR data if the overall normalization is scaled up by at least a factor of two. The STAR data might therefore indicate that the Sivers effect is significantly stronger than thought so far. We also analyze higher-twist contributions to A_N and find that they largely cancel.
description: 15 pages, 7 figures
Editoriale
Creators: name: Favaro, Luciana
name: Menegale, Marcella
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

This special issue is dedicated to the use of technologies aimed at the development of learner autonomy in foreign language learning. This brief editorial presents the main theoretical assumptions related to the concept of learner autonomy, highlighting the fundamental role of the teacher in facilitating students’ reflection and sense of awareness, by the means of the introduction of certain technological tool.

description: EL.LE
Subjective and Objective Quality Assessment of Rendered Human Avatar Videos in Virtual Reality
Creators: name: Chen, Yu-Chih
name: Saha, Avinab
name: Chapiro, Alexandre
name: Häne, Christian
name: Bazin, Jean-Charles
name: Qiu, Bo
name: Zanetti, Stefano
name: Katsavounidis, Ioannis
name: Bovik, Alan C.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We study the visual quality judgments of human subjects on digital human avatars (sometimes referred to as "holograms" in the parlance of virtual reality [VR] and augmented reality [AR] systems) that have been subjected to distortions. We also study the ability of video quality models to predict human judgments. As streaming human avatar videos in VR or AR become increasingly common, the need for more advanced human avatar video compression protocols will be required to address the tradeoffs between faithfully transmitting high-quality visual representations while adjusting to changeable bandwidth scenarios. During transmission over the internet, the perceived quality of compressed human avatar videos can be severely impaired by visual artifacts. To optimize trade-offs between perceptual quality and data volume in practical workflows, video quality assessment (VQA) models are essential tools. However, there are very few VQA algorithms developed specifically to analyze human body avatar videos, due, at least in part, to the dearth of appropriate and comprehensive datasets of adequate size. Towards filling this gap, we introduce the LIVE-Meta Rendered Human Avatar VQA Database, which contains 720 human avatar videos processed using 20 different combinations of encoding parameters, labeled by corresponding human perceptual quality judgments that were collected in six degrees of freedom VR headsets. To demonstrate the usefulness of this new and unique video resource, we use it to study and compare the performances of a variety of state-of-the-art Full Reference and No Reference video quality prediction models, including a new model called HoloQA. As a service to the research community, we publicly releases the metadata of the new database at https://live.ece.utexas.edu/research/LIVE-Meta-rendered-human-avatar/index.html.
description: Accepted to IEEE Transactions on Image Processing, 2024
title: La scelta delle tecnologie nel percorso di sviluppo dell'autonomia di apprendimento linguistico
title: Un modello di applicazione
titleType: Subtitle
Creators: name: Favaro, Luciana
name: Menegale, Marcella
Publisher: name: Edizioni Ca' Foscari - Digital Publishing
Year: 2014

description: Questo contributo si concentra sull’importanza che la presenza di un ambiente tecnologico può avere per lo sviluppo dell’autonomia nell’apprendimento linguistico. Dopo aver ristretto il campo del ragionamento proponendo una definizione specifica del concetto di autonomia che include la presenza della guida del docente, si cercherà di esporre le ragioni per cui l’uso di alcune soluzioni tecnologiche favorirebbe lo sviluppo dell’autonomia. Queste soluzioni verranno descritte suggerendo anche alcune realizzazioni pratiche che il docente di lingue potrà replicare in classe. Il modello di sviluppo di autonomia preso come riferimento è quello originariamente proposto in NUNAN (1997). Esso verrà qui adattato per far corrispondere un’applicazione tecnologica a ciascuno dei 5 livelli previsti da questo modello teorico.
description: EL.LE, 3 | 1 | 2014
An FONLL prescription with coexisting flavor number PDFs
Creators: name: Barontini, Andrea
name: Candido, Alessandro
name: Hekhorn, Felix
name: Magni, Giacomo
name: Stegeman, Roy
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a new prescription to account for heavy quark mass effects in the determination of parton distribution functions (PDFs) based on the FONLL scheme. Our prescription makes explicit use of the freedom to choose the number of active flavors at a given scale and, thus, use coexisting PDFs with different active flavor number. This new prescription is perturbatively equivalent to the former but improves the implementation in two ways. First, it can be naturally generalized to account simultaneously for multiple heavy quark effects, such as charm and bottom effects, which can both be relevant at the same scale due to the small mass difference. Second, it can be trivially generalized to use at any fixed-order or collinear resummed accuracy, while previous prescriptions required ad-hoc expansions of the DGLAP evolution kernels for each coefficient. We supplement the paper with codes for the computation of deep inelastic scattering observables in this new prescription.
description: 17 pages, 4 figures. Version as published in JHEP. Various clarifications added. A new appendix (now App. A) added. Code documentation available from https://pineko.readthedocs.io/en/latest/theory/fonll.html
Spectral response of a nonlinear Jaynes-Cummings model
Creators: name: Medina-Dozal, L.
name: Urzúa, A. R.
name: Aranda-Lozano, D.
name: González-Gutiérrez, C. A.
name: Récamier, J.
name: Román-Ancheyta, R.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The Jaynes-Cummings quantum optics model allows us to understand the dialogue between light and matter at its most fundamental level, which is crucial for advancements in quantum science and technology. Several generalizations of the model have long been proposed, emphasizing their dynamic behavior but paying less attention to their spectroscopy. Here, we obtain analytical expressions of the time-dependent spectral response of a nonlinear Jaynes-Cummings model based on deformed field operators. We show that the long-time response of the resulting nonlinear cavity field resembles the one experimentally obtained in the strong-dispersive regime of circuit quantum electrodynamics. The spectrum is intrinsically asymmetric with the nonlinear coupling, a signature of the impossibility of getting resonant conditions for finite field excitations.
description: 14 pages, 7 figures
Coherence times of dressed states of a superconducting qubit under extreme driving
Creators: name: Wilson, C. M.
name: Duty, T.
name: Persson, F.
name: Sandberg, M.
name: Johansson, G.
name: Delsing, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In this work, we measure longitudinal dressed states of a superconducting qubit, the single Cooper-pair box, and an intense microwave field. The dressed states represent the hybridization of the qubit and photon degrees of freedom, and appear as avoided level crossings in the combined energy diagram. By embedding the circuit in an rf oscillator, we directly probe the dressed states. We measure their dressed gap as a function of photon number and microwave amplitude, finding good agreement with theory. In addition, we extract the relaxation and dephasing rates of these states.
description: 5 pages, 3 figures
Suzanne Collins’ The Hunger Games
Creators: name: Christian, Ludwig
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

Learner Autonomy has become one of the main aims of foreign language learning since Henri Holec’s highly influential publication Autonomy and foreign language learning (1981) in which he highlighted the fact that learners take over responsibility for all aspects of their own learning. Since the internet has become a more interactive and collaborative medium (Web 2.0) which, in contrast to its 1.0 predecessor, allows users to generate their own content or mash-up information, the importance of the so-called participatory web (see e.g. Lee et al., 2008: 501-521) for developing learner autonomy has been emphasised. However, many teachers and learners feel overwhelmed by the sheer endless number of education technology tools available, the opportunities they offer as well as the diversity in technology and autonomy research. This paper aims at discussing the role of technology in the context of learner autonomy by investigating the use of different technologies in literature projects. Suzanne Collins’s The Hunger Games, the first part of The Hunger Game’s trilogy, set in the fictional dystopian world of Panem, will be taken as an example of how successfully to employ technology in language learning to support learner autonomy.

description: EL.LE
Combining density functional theory with macroscopic QED for quantum light-matter interactions in 2D materials
Creators: name: Svendsen, Mark Kamper
name: Kurman, Yaniv
name: Schmidt, Peter
name: Koppens, Frank
name: Kaminer, Ido
name: Thygesen, Kristian S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantitative and predictive theory of quantum light-matter interactions in ultra thin materials involves several fundamental challenges. Any realistic model must simultaneously account for the ultra-confined plasmonic modes and their quantization in the presence of losses, while describing the electronic states from first principles. Herein we develop such a framework by combining density functional theory (DFT) with macroscopic quantum electrodynamics, which we use to show Purcell enhancements reaching $10^7$ for intersubband transitions in few-layer transition metal dichalcogenides sandwiched between graphene and a perfect conductor. The general validity of our methodology allows us to put several common approximation paradigms to quantitative test, namely the dipole-approximation, the use of 1D quantum well model wave functions, and the Fermi's Golden rule. The analysis shows that the choice of wave functions is of particular importance. Our work lays the foundation for practical ab initio-based quantum treatments of light matter interactions in realistic nanostructured materials.
A functional renormalization group approach to systems with long-range correlated disorder
Creators: name: Fedorenko, Andrei A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We studied the statics and dynamics of elastic manifolds in disordered media with long-range correlated disorder using functional renormalization group (FRG). We identified different universality classes and computed the critical exponents and universal amplitudes describing geometric and velocity-force characteristics. In contrast to uncorrelated disorder, the statistical tilt symmetry is broken resulting in a nontrivial response to a transverse tilting force. For instance, the vortex lattice in disordered superconductors shows a new glass phase whose properties interpolate between those of the Bragg and Bose glasses formed by pointlike and columnar disorder, respectively. Whereas there is no response in the Bose glass phase (transverse Meissner effect), the standard linear response expected in the Bragg-glass gets modified to a power law response in the presence of disorder correlations. We also studied the long distance properties of the O(N) spin system with random fields and random anisotropies correlated as 1/x^{d-sigma}. Using FRG we obtained the phase diagram in (d,sigma,N)-parameter space and computed the corresponding critical exponents. We found that below the lower critical dimension 4+sigma, there can exist two different types of quasi-long-range-order with zero order-parameter but infinite correlation length.
description: 6 pages, 1 figure
Developing Lexical Awareness with ICT
Creators: name: Bozzo, Luisa
Publisher: name: Università Ca’ Foscari Venezia, Italia
Year: 2014

description:

Ampliare il patrimonio lessicale degli apprendenti di una lingua straniera è uno degli obiettivi fondamentali delle più recenti teorie e pratiche glottodidattiche, così come lo sviluppo della capacità degli studenti di apprendere il lessico autonomamente mediante strategie adeguate. Per il raggiungimento di tali obiettivi l’impiego delle tecnologie dell’informazione e della comunicazione consente di avvalersi di efficaci paradigmi di apprendimento quali il costruzionismo, l’apprendimento per compiti e l’apprendimento esperienziale. Questo articolo presenta uno studio per la creazione di un percorso guidato, in modalità laboratoriale online, nel contesto degli studi universitari di secondo livello, ed è articolato in tre parti: la presentazione dei principi teorici ispiratori; gli aspetti progettuali, inclusi gli obiettivi specifici, il contesto didattico, gli strumenti; la descrizione della progressione delle varie tipologie di attività e delle loro funzioni.

Expanding the L2 learners’ mental lexicon is a core issue in much recent language teaching theory and practice, as well as developing the learners’ ability to learn autonomously by applying vocabulary learning strategies. The introduction of ICT in language teaching opens up the opportunity of implementing efficacious learning paradigms such as constructionism, task-based learning and experiential learning to achieve these goals. This study illustrates how university students of English as a foreign language may be guided towards increasing lexical awareness by means of deep processing, as advocated by cognitive linguistic approaches, in the collaborative creation of a specialist glossary in a Moodle environment. After introducing the main pedagogical principles informing the methodology, namely the lexical approach, cognitive linguistic motivation, task-based learning and experiential learning, the paper presents the design features of a blended learning English Language course leading up to the creation of the glossary as a final task, with reference to objectives, learning context, tools and materials, and graded activities.

description: EL.LE
New limit on the $K^0_L \to π^0 ν\barν$ decay rate
Creators: name: E391a Collaboration
name: Ahn, J. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The first dedicated experiment for the rare kaon decay $K^0_L \to π^0 ν\barν$ has been performed by the E391a collaboration at the KEK 12-GeV proton synchrotron. A new upper limit of $2.1 \times 10^{-7}$ at the 90% confidence level was set for the branching ratio of the decay $K^0_L \to π^0 ν\barν$ using about 10% of the data collected during the first period of data taking.
description: 5 pages, 4 figures, the title was changed
Plaquette expectation value and lattice free energy of three-dimensional SU(N) gauge theory
Creators: name: Hietanen, A.
name: Kurkela, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use high precision lattice simulations to calculate the plaquette expectation value in three-dimensional SU(N) gauge theory for N=2,3,4,5,8. Using these results, we study the N-dependence of the first non-perturbative coefficient in the weak-coupling expansion of hot QCD. We demonstrate that, in the limit of large N, the functional form of the plaquette expectation value with ultraviolet divergences subtracted is 15.9(2)-44(2)/N^2.
description: 14 pages, 6 figures. v2: references added; published version
Shape-constrained Symbolic Regression -- Improving Extrapolation with Prior Knowledge
Creators: name: Kronberger, Gabriel
name: de França, Fabricio Olivetti
name: Burlacu, Bogdan
name: Haider, Christian
name: Kommenda, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We investigate the addition of constraints on the function image and its derivatives for the incorporation of prior knowledge in symbolic regression. The approach is called shape-constrained symbolic regression and allows us to enforce e.g. monotonicity of the function over selected inputs. The aim is to find models which conform to expected behaviour and which have improved extrapolation capabilities. We demonstrate the feasibility of the idea and propose and compare two evolutionary algorithms for shape-constrained symbolic regression: i) an extension of tree-based genetic programming which discards infeasible solutions in the selection step, and ii) a two population evolutionary algorithm that separates the feasible from the infeasible solutions. In both algorithms we use interval arithmetic to approximate bounds for models and their partial derivatives. The algorithms are tested on a set of 19 synthetic and four real-world regression problems. Both algorithms are able to identify models which conform to shape constraints which is not the case for the unmodified symbolic regression algorithms. However, the predictive accuracy of models with constraints is worse on the training set and the test set. Shape-constrained polynomial regression produces the best results for the test set but also significantly larger models.
Additional file 4: of Transketolase (TKT) activity and nuclear localization promote hepatocellular carcinoma in a metabolic and a non-metabolic manner
Creators: name: Qin, Zhaoyu
name: Xiang, Chan
name: Zhong, Fan
name: Liu, Yang
name: Dong, Qiongzhu
name: Li, Kai
name: Shi, Wenhao
name: Ding, Chen
name: Qin, Lunxiu
name: He, Fuchu
Publisher: name: figshare
Year: 2019
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Cancer
subject: Hematology
subject: Virology

description: Figure S2. Truncations and mutations to determine the NLS of TKT. A. TKT truncations covering 2/3 of the full length from the N or C terminus showed the presence of the NLS at both the N and C termini of TKT. B-C. Truncations and mutants determined that the NLS sites of TKT were Y4 or K6 at the N-terminus and DAIA from 610 to 614 near the C-terminus. However, any mutations in DAIA destabilized TKT. (PDF 419 kb)
The coronal structure of AB Dor determined from contemporaneous Doppler imaging and X-ray spectroscopy
Creators: name: Hussain, G. A. J.
name: Jardine, M.
name: Donati, J. -F.
name: Brickhouse, N. S.
name: Dunstone, N. J.
name: Wood, K.
name: Dupree, A. K.
name: Cameron, A. Collier
name: Favata, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We obtain contemporaneous observations of the surface and corona of AB Dor using ground-based circularly polarised spectra from the Anglo-Australian Telescope and X-ray data from the Chandra satellite. The ground-based data are used to construct surface magnetic field maps, which are extrapolated to produce detailed models of the quiescent corona. The X-ray data serve as a new test for the validity of these coronal models. The high coronal density and complex multi-polar magnetic field indicate a compact X-ray corona, which is concentrated close to the surface, with a height, H~0.3-0.4R*. There is also significant correlation between the surface and coronal active region locations. At this epoch AB Dor appears to possess one very large active longitude region; displaying enhanced activity in the form of large dark spots, strong magnetic fields and chromospheric emission. Finally, the level of rotational modulation and shape of the X-ray lightcurve depend on the distribution of magnetic field in the obscured hemisphere. The models that best reproduce the rotational modulation observed in the contemporaneous Chandra X-ray lightcurve and spectra require the magnetic field in the obscured hemisphere to be of the same polarity as that in the observed hemisphere. The Sun shows different behaviour, with the leading polarity reversed in the opposite hemisphere. The X-ray observations provide a unique constraint on the magnetic structure in the obscured hemisphere.
description: 17 pages, 14 figures, accepted by MNRAS. This version has cropped figures. For a preprint with the original figures please go to http://star-www.st-and.ac.uk/~gajh/papers07
MOESM11 of Construction and comprehensive analysis of a ceRNA network to reveal potential prognostic biomarkers for hepatocellular carcinoma
Creators: name: Long, Junyu
name: Bai, Yi
name: Yang, Xiaobo
name: Lin, Jianzhen
name: Yang, Xu
name: Wang, Dongxu
name: He, Li
name: Zheng, Yongchang
name: Zhao, Haitao
Publisher: name: figshare
Year: 2019
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: Additional file 11: Table S11. Gene enrichment in the high CCNB1 expression group of patients with HCC in the TCGA HCC cohort.
Localization versus inhomogeneous superfluidity: Submonolayer He-4 on fluorographene, hexagonal boron nitride, and graphene
Creators: name: Moroni, Saverio
name: Ancilotto, Francesco
name: Silvestrelli, Pier Luigi
name: Reatto, Luciano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a sub monolayer He-4 adsorbed on fluorographene (GF) and on hexagonal boron nitride (hBN) at low coverage. The adsorption potentials have been computed ab-initio with a suitable density functional theory including dispersion forces. The properties of the adsorbed He-4 atoms have been computed at finite temperature with path integral Monte Carlo and at T=0 K with variational path integral. From both methods we find that the lowest energy state of He-4 on GF is a superfluid. Due to the very large corrugation of the adsorption potential this superfluid has a very strong spatial anisotropy, the ratio between the largest and smallest areal density being about 6, the superfluid fraction at the lowest T is about 55%, and the temperature of the transition to the normal state is in the range 0.5-1 K. Thus, GF offers a platform for studying the properties of a strongly interacting highly anisotropic bosonic superfluid. At a larger coverage He-4 has a transition to an ordered commensurate state with occupation of 1/6 of the adsorption sites. This phase is stable up to a transition temperature located between 0.5 and 1~K. The system has a triangular order similar to that of He-4 on graphite. The lowest energy state of He-4 on hBN is an ordered commensurate state with occupation of 1/3 of the adsorption sites and triangular symmetry. A disordered state is present at lower coverage as a metastable state. In the presence of an electric field the corrugation of the adsorption potential is slightly increased but up to a magnitude of 1 V/Ang. the effect is small and does not change the stability of the phases of He-4 on GF and hBN. We have verified that also in the case of graphene such electric field does not modify the stability of the commensurate sqrt{3}*sqrt{3}R30 phase.
description: 12 pages, 14 figures