cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A symplectic particle-in-cell model for space-charge beam dynamics simulation
Creators: name: Qiang, Ji
Publisher: name: arXiv
Year: 2018
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Space-charge effects play an important role in high intensity particle accelerators and were studied using a variety of macroparticle tracking models. In this paper, we propose a symplectic particle-in-cell (PIC) model and compare this model with a recently published symplectic gridless particle model and a conventional nonsymplectic PIC model for long-term space-charge simulation of a coasting beam. Using the same step size and the same number of modes for the space-charge Poisson solver, all three models show qualitatively similar emittance growth evolutions and final phase space shapes in the benchmark examples. Quantitatively, the symplectic PIC and the symplectic gridless particle models agree with each other very well, while the nonsymplectic PIC model yields different emittance growth value. Using finer step size, the emittance growth from the nonsymplectic PIC converges towards that from the symplectic PIC model.
description: arXiv admin note: substantial text overlap with arXiv:1610.04763
Política de gestión de datos en DIGITAL.CSIC
Creators: name: Román-Molina, Juan
name: Molina Fernández, Cecilia
name: Oficina Técnica De DIGITAL.CSIC
Publisher: name: CSIC - Unidad de Recursos de Información Científica para la Investigación (URICI)
Year: 2024
Subjects: Datos abiertos de investigación
Política de datos
Datasets
Conjuntos de datos
DIGITAL.CSIC

description: DISPONIBLE PROXIMAMENTE
description: Sesión formativa relativa a la gestión de datos en investigación, realizada a través de la plataforma Conecta el 14 de marzo de 2024 de 11 a 12:30 horas
On the composition dependence of the microscopic structure, thermodynamic, dynamic and dielectric properties of water-dimethyl formamide model mixtures. Molecular dynamics simulation results
Creators: name: Dominguez, H.
name: Pizio, O.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Isothermal-isobaric molecular dynamics simulations have been performed to examine an ample set of properties of the model water-N,N-dimethylformamide (DMF) mixture as a function of composition. The SPC-E and TIP4P-Ew water models together with two united atom models for DMF [Chalaris M., Samios J., J. Chem. Phys., 2000, 112, 8581; Cordeiro J., Int. J. Quantum Chem., 1997, 65, 709] were used. Our principal analyses concern the behaviour of structural properties in terms of radial distribution functions, and the number of hydrogen bonds between molecules of different species as well as thermodynamic properties. Namely, we explore the density, excess mixing molar volume and enthalpy, the heat capacity and excess mixing heat capacity. Finally, the self-diffusion coefficients of species and the dielectric constant of the system are discussed. In addition, surface tension of water-DMF mixtures has been calculated and analyzed.
description: 15 pages, 11 figures
Cognitive variability.
Creators: name: Siegler, Robert
Publisher: name: Carnegie Mellon University
Year: 2007
Subjects: subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: Children's thinking is highly variable at every level of analysis, from neural and associative levels to the level of strategies, theories, and other aspects of high-level cognition. This variability exists within people as well as between them; individual children often rely on different strategies or representations on closely related problems presented close in time. Recognizing such variability can help us both describe development more accurately and better explain how cognitive change occurs.
't Hooft vertices, partial quenching, and rooted staggered QCD
Creators: name: Bernard, Claude
name: Golterman, Maarten
name: Shamir, Yigal
name: Sharpe, Stephen
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the properties of 't Hooft vertices in partially quenched and rooted versions of QCD in the continuum. These theories have a physical subspace, equivalent to ordinary QCD, that is contained within a larger space that includes many unphysical correlation functions. We find that the 't Hooft vertices in the physical subspace have the expected form, despite the presence of unphysical 't Hooft vertices appearing in correlation functions that have an excess of valence quarks (or ghost quarks). We resolve an apparent paradox that arises when one uses rooted staggered fermions to study one-flavor QCD, by showing how, in partially quenched theories, it is possible to have spontaneous symmetry breaking of a non-anomalous symmetry in finite volume. Using these results, we demonstrate that arguments recently given by Creutz--claiming to disprove the validity of rooted staggered QCD--are incorrect. In particular, the unphysical 't Hooft vertices do not present an obstacle to the recovery of taste symmetry in the continuum limit.
description: 19 pages, revtex, shortened version to appear in Phys. Rev. D
title: The formation of quasars in low-luminosity hosts via galaxy harassment
Creators: name: Lake, G
name: Katz, N
name: Moore, B
Publisher: name: University of Massachusetts Amherst
Year: 1998
Subjects: subject: galaxies
subject: evolution
subject: interactions
subject: structure
subject: hydrodynamics methods
subject: numerical
subject: quasars
subject: general
subject: Astrophysics and Astronomy

description: This is the pre-published version harvested from ArXiv. The published version is located at http://iopscience.iop.org/0004-637X/495/1/152/
description: We have simulated disk galaxies undergoing continual bombardment by other galaxies in a rich cluster. "Galaxy harassment" leads to dramatic evolution of smaller disk galaxies and provides an extremely effective mechanism for fueling a central quasar. Within a few billion years after a small disk galaxy enters the cluster environment, up to 90% of its gas can be driven into the inner 500 pc. Up to half of the mass can be transferred in a burst lasting just 100-200 Myr. This transport of gas to the center of galaxy is far more efficient than any mechanism proposed before. Galaxy harassment was first proposed to explain the disturbance of blue galaxies in clusters seen at z 0.3, known as the "Butcher-Oemler effect." Quasars at the same redshifts lie in more clustered environments than those at lower redshifts. Recent Hubble Space Telescope observations find that roughly half of all observed quasar host galaxies are fainter than L*, with many of these less luminous hosts occurring at redshifts z 0.3. We examine five quasars that are claimed to have low-luminosity hosts and find that three are in rich clusters of galaxies; the fourth may be in a cluster, but the evidence for this is marginal. The environment of the fifth has not been studied.
A Sino-German $λ$6\ cm polarization survey of the Galactic plane. V. Large supernova remnants
Creators: name: Gao, X. Y.
name: Han, J. L.
name: Reich, W.
name: Reich, P.
name: Sun, X. H.
name: Xiao, L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Observations of large supernova remnants (SNRs) at high frequencies are rare, but provide valuable information about their physical properties. The total intensity and polarization properties of 16 large SNRs in the Galactic plane were investigated based on observations of the Urumqi $λ$6\ cm polarization survey of the Galactic plane with an angular resolution of 9$\farcm$5. We extracted total intensity and linear polarization maps of large SNRs from the Urumqi $λ$6\ cm survey, obtained their integrated flux densities, and derived the radio spectra in context with previously published flux densities at various frequencies. In particular, Effelsberg $λ$11\ cm and $λ$21\ cm survey data were used for calculating integrated flux densities. The $λ$6\ cm polarization data also delineate the magnetic field structures of the SNRs. We present the first total intensity maps at $λ$6\ cm for SNRs G106.3+2.7, G114.3+0.3, G116.5+1.1, G166.0+4.3 (VRO 42.05.01), G205.5+0.5 (Monoceros Nebula) and G206.9+2.3 (PKS 0646+06) and the first polarization measurements at $λ$6\ cm for SNRs G82.2+5.3 (W63), G106.3+2.7, G114.3+0.3, G116.5+1.1, G166.0+4.3 (VRO 42.05.01), G205.5+0.5 (Monoceros Nebula) and G206.9+2.3 (PKS 0646+06). Most of the newly derived integrated radio spectra are consistent with previous results. The new flux densities obtained from the Urumqi $λ$6\ cm, Effelsberg $λ$11\ cm and $λ$21\ cm surveys are crucial to determine the spectra of SNR G65.1+0.6, G69.0+2.7 (CTB 80), G93.7-0.2 and G114.3+0.3. We find that G192.8$-$1.1 (PKS 0607+17) consists of background sources, \ion{H}{II} regions and the extended diffuse emission of thermal nature, and conclude that G192.8$-$1.1 is not a SNR.
description: 15 pages, 10 figures, accepted by A&\amp;A. Language improved. For the version with high resolution figures, please go to: http://zmtt.bao.ac.cn/6cm/paper/gxy_largeSNR.pdf
Cognitive Tutor: Applied research in mathematics education
Creators: name: Ritter, Steven
name: Anderson, John R.
name: Koedinger, Kenneth R
name: Corbett, Albert
Publisher: name: Carnegie Mellon University
Year: 2007
Subjects: subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: For 25 years, we have been working to build cognitive models of mathematics, which have become a basis for middle- and high-school curricula. We discuss the theoretical background of this approach and evidence that the resulting curricula are more effective than other approaches to instruction. We also discuss how embedding a well specified theory in our instructional software allows us to dynamically evaluate the effectiveness of our instruction at a more detailed level than was previously possible. The current widespread use of the software is allowing us to test hypotheses across large numbers of students. We believe that this will lead to new approaches both to understanding mathematical cognition and to improving instruction.
All-optical control of surface plasmons by second-harmonic generation
Creators: name: Rodrigo, Sergio G.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Light with light control of surface plasmon polaritons is theoretically demonstrated. A barely simple and compact source of these waves consists in a finite number of slits (evenly spaced) perforating a metal film. The system scatters electromagnetic fields in one side of the metal film when it is illuminated from the opposite side by a polarized light source. High intensity light sources moreover efficiently generate light at second harmonic and higher frequencies in the metal led by optical nonlinearities. It is shown how the mixing of fields scattered by the slits from a weak beam at $λ$ wavelength, with the second harmonic fields generated by a high intensity $2 λ$ beam, creates a destructive interference of surface plasmons in one of the two possible directions of emission from the slits, while these are enhanced along the opposite direction. The unidirectional launching of surface plasmons is due to the different properties of symmetry at $λ$ whether they are linearly or nonlinearly generated. It is envisaged a nanodevice which might allow sending digital information codified in the surface plasmon field or be used to build ultra-narrow bandwidth surface plasmon frequency combs.
description: 5 pages, 3 figures, Supplemental Material
Cognitive Research and Elementary Science Instruction: From the Laboratory, to the Classroom, and Back
Creators: name: Junlei  Li
name: Klahr, David
Publisher: name: Carnegie Mellon University
Year: 2005
Subjects: subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: Can cognitive research generate usable knowledge for elementary science instruction? Can issues raised by classroom practice drive the agenda of laboratory cognitive research? Answering yes to both questions, we advocate building a reciprocal interface between basic and applied research. We discuss five studies of the teaching, learning, and transfer of the “Control of Variables Strategy” in elementary school science. Beginning with investigations motivated by basic theoretical questions, we situate subsequent inquiries within authentic educational debates—contrasting hands-on manipulation of physical and virtual materials, evaluating direct instruction and discovery learning, replicating training methods in classroom, and narrowing science achievement gaps. We urge research programs to integrate basic research in “pure” laboratories with field work in “messy” classrooms. Finally, we suggest that those engaged in discussions about implications and applications of educational research focus on clearly defined instructional methods and procedures, rather than vague labels and outmoded “-isms.”
Non-metric gravity: A status report
Creators: name: Krasnov, Kirill
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the status of a certain (infinite) class of four-dimensional generally covariant theories propagating two degrees of freedom that are formulated without any direct mention of the metric. General relativity itself (in its Plebanski formulation) belongs to the class, so these theories are examples of modified gravity. We summarize the current understanding of the nature of the modification, of the renormalizability properties of these theories, of their coupling to matter fields, and describe some of their physical properties.
description: 13 pages, no figures, invited brief review for MPLA
Collisional Effects, Ion-Acoustic Waves and Neutrino Oscillations
Creators: name: Haas, Fernando
name: Pascoal, Kellen Alves
name: Mendonça, José Tito
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We analyze the role of collisional effects on the coupling between ion-acoustic waves and neutrino flavor oscillations, discussing its relevance for plasma instabilities in extreme plasma environments like in type II supernovae, where intense neutrino bursts exist. Electrons (leptons) are coupled to the electron-neutrino fluid through the weak Fermi force, but the electron-neutrinos are allowed to convert to other neutrino flavors and vice-versa. Due to the typically slow frequency of neutrino flavor oscillations, many orders smaller than e.g. the plasma frequency, an effective energy transfer between plasma waves and neutrino flavor oscillations take place at the low-frequency electrostatic branch, viz. the ion-acoustic mode. We show the destabilization of ion-acoustic waves in dense astrophysical scenarios, with a focus on the collisional effects mediated by electron-ion scattering. The maximal instability growth-rate is evaluated and compared to characteristic inverse times of type II supernova explosions. The results can be used for independent experimental verification of the non-zero neutrino mass, in a plasma physics context.
Constraining Nonstandard Neutrino-Electron Interactions
Creators: name: Barranco, J.
name: Miranda, O. G.
name: Moura, C. A.
name: Valle, J. W. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a detailed analysis on nonstandard neutrino interactions (NSI) with electrons including all muon and electron (anti)-neutrino data from existing accelerators and reactors, in conjunction with the ``neutrino counting'' data (e- e+ -> nu nu gamma) from the four LEP collaborations. First we perform a one-parameter-at-a-time analysis, showing how most constraints improve with respect to previous results reported in the literature. We also present more robust results where the NSI parameters are allowed to vary freely in the analysis. We show the importance of combining LEP data with the other experiments in removing degeneracies in the global analysis constraining flavor-conserving NSI parameters which, at 90 % and 95 % C.L., must lie within unique allowed regions. Despite such improved constraints, there is still substantial room for improvement, posing a big challenge for upcoming experiments.
description: 19 pages, 4 figures. Final version to appear in Phys. Rev. D
Lattice gauge theory with staggered fermions: how, where, and why (not)
Creators: name: Kronfeld, Andreas S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Many results from lattice QCD of broad importance to particle and nuclear physics are obtained with 2+1 flavors of staggered sea quarks. In the continuum limit, staggered fermions yield four species, called tastes. To reduce the number of tastes to one (per flavor), the simulation employs the fourth root of the four-taste staggered fermion determinant. This talk surveys evidence in favor of this procedure, refutes recent criticisms, and reviews recent algorithmic and technical improvements. Physics results are covered in other plenary talks.
description: 25 pages; Lattice 2007 (plenary); v2 corrects typos, adds references, moves endnote to footnote, and conforms with version published in PoS
Cognitive reappraisal increases neuroendocrine reactivity to acute social stress and physical pain.
Creators: name: Denson, Thomas F
name: J. David Creswell
name: Terides, Matthew D.
name: Blundell, Kate
Publisher: name: Carnegie Mellon University
Year: 2014
Subjects: subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: Cognitive reappraisal can foster emotion regulation, yet less is known about whether cognitive reappraisal alters neuroendocrine stress reactivity. Some initial evidence suggests that although long-term training in cognitive behavioral therapy techniques (which include reappraisal as a primary training component) can reduce cortisol reactivity to stress, some studies also suggest that reappraisal is associated with heightened cortisol stress reactivity. To address this mixed evidence, the present report describes two experimental studies that randomly assigned young adult volunteers to use cognitive reappraisal while undergoing laboratory stressors. Relative to the control condition, participants in the reappraisal conditions showed greater peak cortisol reactivity in response to a socially evaluative speech task (Experiment 1, N=90) and to a physical pain cold pressor task (Experiment 2, N=94). Participants in the cognitive reappraisal group also reported enhanced anticipatory psychological appraisals of self-efficacy and control in Experiment 2 and greater post-stressor self-efficacy. There were no effects of the reappraisal manipulation on positive and negative subjective affect, pain, or heart rate in either experiment. These findings suggest that although cognitive reappraisal fosters psychological perceptions of self-efficacy and control under stress, this effortful emotion regulation strategy in the short-term may increase cortisol reactivity. Discussion focuses on promising psychological mechanisms for these cognitive reappraisal effects.
Effective Temperature of Red Blood Cell Membrane Fluctuations
Creators: name: Ben-Isaac, Eyal
name: Park, YongKeun
name: Popescu, Gabriel
name: Brown, Frank L. H.
name: Gov, Nir S.
name: Shokef, Yair
Publisher: name: arXiv
Year: 2011
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Biologically driven non-equilibrium fluctuations are often characterized by their non-Gaussianity or by an "effective temperature", which is frequency dependent and higher than the ambient temperature. We address these two measures theoretically by examining a randomly kicked "particle", with a variable number of kicking "motors", and show how these two indicators of non-equilibrium behavior can contradict. Our results are compared with new experiments on shape fluctuations of red-blood cell membranes, and demonstrate how the physical nature of the motors in this system can be revealed using these global measures of non-equilibrium.
description: 5 pages, 4 figures, Supplementary Information at http://www.weizmann.ac.il/~feshokef/rbc.html
title: ADCO, Cart. 186 (11 H 71), f. 0474v
Creators: name: de la Côte d'Or, Archives départementales
name: CBMA/CG21/F.PETOT/2012
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: Cartulaire général de Cîteaux, dit de Jean de Cirey, t. II (XVe siècle), tome II, Archives départementales de la Côte-d'Or, C
art. 186 (11 H 71). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire général de Cîteaux, dit de Jean de Cirey, t. II (XVe siècle), tome II, Archives départementales de la
 Côte-d'Or, Cart. 186 (11 H 71), f. 0474v, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-
project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
Noncritical Holographic QCD in External Electric Field
Creators: name: Davody, Ali
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate behavior of a noncritical model in external electric field and explore its phase structure in the quenched approximation N_f>> N_c. We compute the conductivity of QCD plasma in this model and compare it with the predictions of Sakai-Sugimoto model, D3-D7 system and the lattice simulation. We find that, while the behavior of conductivity in noncritical model as a function of temperature and baryon density is similar to those of D3-D7 system, the phase diagram of noncritical model resembles the phase diagram of Sakai-Sugimoto model.
description: 17 pages, 5 figures, typos corrected and refs added
Cognitive load of navigating without vision when guided by virtual sound versus spatial language.
Creators: name: Klatzky, Roberta
name: Marston, James R.
name: Giudice, Nicholas A.
name: Golledge, Reginald G.
name: Loomis, Jack M.
Publisher: name: Carnegie Mellon University
Year: 2006
Subjects: subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: A vibrotactile N-back task was used to generate cognitive load while participants were guided along virtual paths without vision. As participants stepped in place, they moved along a virtual path of linear segments. Information was provided en route about the direction of the next turning point, by spatial language ("left," "right," or "straight") or virtual sound (i.e., the perceived azimuth of the sound indicated the target direction). The authors hypothesized that virtual sound, being processed at direct perceptual levels, would have lower load than even simple language commands, which require cognitive mediation. As predicted, whereas the guidance modes did not differ significantly in the no-load condition, participants showed shorter distance traveled and less time to complete a path when performing the N-back task while navigating with virtual sound as guidance. Virtual sound also produced better N-back performance than spatial language. By indicating the superiority of virtual sound for guidance when cognitive load is present, as is characteristic of everyday navigation, these results have implications for guidance systems for the visually impaired and others.
title: The bar-halo interaction - I. From fundamental dynamics to revised N-body requirements
Creators: name: Weinberg, MD
name: Katz, N
Publisher: name: University of Massachusetts Amherst
Year: 2007
Subjects: subject: stellar dynamics
subject: galaxies : evolution
subject: galaxies : haloes
subject: galaxy : structure
subject: dark matter
subject: Astrophysics and Astronomy

description: This is a pre-published version which is collected from arXiv link. The published version is at http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2006.11306.x/abstract
description: A galaxy remains near equilibrium for most of its history. Only through resonances can non-axisymmetric features, such as spiral arms and bars, exert torques over large scales and change the overall structure of the galaxy. In this paper, we describe the resonant interaction mechanism in detail, derive explicit criteria for the particle number required to simulate these dynamical processes accurately using N-body simulations, and illustrate them with numerical experiments. To do this, we perform a direct numerical solution of perturbation theory, in short, by solving for each orbit in an ensemble and make detailed comparisons with N-body simulations. The criteria include: sufficient particle coverage in phase space near the resonance and enough particles to minimize gravitational potential fluctuations that will change the dynamics of the resonant encounter. These criteria are general in concept and can be applied to any dynamical interaction. We use the bar–halo interaction as our primary example owing to its technical simplicity and astronomical ubiquity. Some of our more surprising findings are as follows. First, the inner Lindblad like resonance, responsible for coupling the bar to the central halo cusp, requires more than inline image equal-mass particles within the virial radius or inline image inside the bar radius for a Milky Way like bar in a Navarro, Frenk & White profile. Secondly, orbits that linger near the resonance receive more angular momentum than orbits that move through the resonance quickly. Small-scale fluctuations present in state-of-the-art particle–particle simulations can knock orbits out of resonance, preventing them from lingering and, thereby, decrease the torque per orbit. This can be offset by the larger number of orbits affected by the resonance due to the diffusion. However, noise from orbiting substructure remains at least an order of magnitude too small to be of consequence. Applied to N-body simulations, the required particle numbers are sufficiently high for scenarios of interest that apparent convergence in particle number is misleading: the convergence with N may still be in the noise-dominated regime. State-of-the-art simulations are not adequate to follow all aspects of secular evolution driven by the bar–halo interaction. It is not possible to derive particle number requirements that apply to all situations, for example, more subtle interactions may be even more difficult to simulate. Therefore, we present a procedure to test the requirements for individual N-body codes to the actual problem of interest.
Global analysis of a continuum model for monotone pulse-coupled oscillators
Creators: name: Mauroy, Alexandre
name: Sepulchre, Rodolphe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider a continuum of phase oscillators on the circle interacting through an impulsive instantaneous coupling. In contrast with previous studies on related pulse-coupled models, the stability results obtained in the continuum limit are global. For the nonlinear transport equation governing the evolution of the oscillators, we propose (under technical assumptions) a global Lyapunov function which is induced by a total variation distance between quantile densities. The monotone time evolution of the Lyapunov function completely characterizes the dichotomic behavior of the oscillators: either the oscillators converge in finite time to a synchronous state or they asymptotically converge to an asynchronous state uniformly spread on the circle. The results of the present paper apply to popular phase oscillators models (e.g. the well-known leaky integrate-and-fire model) and draw a strong parallel between the analysis of finite and infinite populations. In addition, they provide a novel approach for the (global) analysis of pulse-coupled oscillators.
description: 33 pages
Gastrallus kayiasi Zahradnik 2023, sp. nov.
Creators: name: Zahradník, Petr
name: Demetriou, Jakovos
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Anobiidae
Gastrallus
Gastrallus kayiasi

description: Gastrallus kayiasi Zahradník sp. nov.
Distribution. Cyprus (endemic).
Notes. Morphological description and habitat notes are provided above.
description: Published as part of Zahradník, Petr & Demetriou, Jakovos, 2023, A review of the Ptinidae (Coleoptera: Bostrichoidea) of Cyprus, including new faunistic records and the description of a new species, pp. 243-265 in Zootaxa 5306 (2) on page 248, DOI: 10.11646/zootaxa.5306.2.5, http://zenodo.org/record/8061315
Integer quantum Hall effect and topological phase transitions in silicene
Creators: name: Liu, Y. L.
name: Luo, G. X.
name: Xu, N.
name: Tian, H. Y.
name: Ren, C. D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We numerically investigate the effects of disorder on the quantum Hall effect (QHE) and the quantum phase transitions in silicene based on a lattice model. It is shown that for a clean sample, silicene exhibits an unconventional QHE near the band center, with plateaus developing at $ν=0,\pm2,\pm6,\ldots,$ and a conventional QHE near the band edges. In the presence of disorder, the Hall plateaus can be destroyed through the float-up of extended levels toward the band center, in which higher plateaus disappear first. However, the center $ν=0$ Hall plateau is more sensitive to disorder and disappears at a relatively weak disorder strength. Moreover, the combination of an electric field and the intrinsic spin-orbit interaction (SOI) can lead to quantum phase transitions from a topological insulator to a band insulator at the charge neutrality point (CNP), accompanied by additional quantum Hall conductivity plateaus.
description: 7 pages, 4 figures
Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
Creators: name: Freire, Rodrigo M.
name: Montero, Guillermo A.
name: Vesprini, José L.
name: Barberis, Ignacio M.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: Marine Biology
subject: Plant Biology
subject: 60506 Virology

description: Bromeliads interact with thousands of plants, animals and microorganisms. Some species are considered keystone species for providing shelter and protection to many species from vertebrates to microbes. Aechmea distichantha is a tank bromeliad distributed in the mid-latitudes of South America, known to interact with a wide variety of animal species. Studies aiming to provide inventories of the whole fauna associated are needed. An exhaustive academic review of interactions of this plant species with fauna was carried out including scientific articles, books, book chapters, theses, and reports published in different languages, where interactions between A. distichantha and an animal species were reported. These interactions were classified depending on the use that animals made of the plant and on the part of the plant involved. Since 1960, 347 animal morphospecies, involved in 495 interactions with A. distichantha have been documented. The plant was principally used as habitat or shelter, secondly used for food supply (herbivores, detritivores and predators), and finally for nesting. Morphospecies were mainly associated with the foliage and the phytotelmata, but also with the inflorescence, the inter-ramet space and the stolon. Invertebrates: Arachnids, mainly took refuge or shelter in the plant, and also found their preys. Insects, the most important class, took refuge on or inhabited in the plant and to a lesser extent used the plant for food supply. Vertebrates: amphibians, tortoises and reptiles exclusively used the plant for shelter, while birds and mammals mainly established feeding links. This is the first proposal tending to collect the whole set of animals interacting with this species. Aechmea distichantha is a keystone species that establish diverse, numerous direct and empirically detected interactions with fauna, and plays an important role in providing ecosystem services to humans.
Additional file 1 of MIR22HG acts as a tumor suppressor via TGFβ/SMAD signaling and facilitates immunotherapy in colorectal cancer
Creators: name: Xu, Juan
name: Shao, Tingting
name: Song, Mingxu
name: Xie, Yunjin
name: Zhou, Jialiang
name: Yin, Jiaqi
name: Ding, Na
name: Zou, Haozhe
name: Li, Yongsheng
name: Zhang, Jiwei
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Computational Biology

description: Additional file 1. Supporting Materials and Methods.
Spatial nonhomogeneous periodic solutions induced by nonlocal prey competition in a diffusive predator-prey model
Creators: name: Chen, Shanshan
name: Wei, Junjie
name: Yang, Kaiqi
Publisher: name: arXiv
Year: 2018
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: The diffusive Holling-Tanner predator-prey model with no-flux boundary conditions and nonlocal prey competition is considered in this paper. We show the existence of spatial nonhomogeneous periodic solutions, which is induced by nonlocal prey competition. In particular, the constant positive steady state can lose the stability through Hopf bifurcation when the given parameter passes through some critical values, and the bifurcating periodic solutions near such values can be spatially nonhomogeneous and orbitally asymptotically stable. This phenomenon is different from that in models without nonlocal effect.
description: 28 pages, 8 figures
Weak antilocalization in HgTe quantum wells and topological surface states: Massive versus massless Dirac fermions
Creators: name: Tkachov, G.
name: Hankiewicz, E. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: HgTe quantum wells and surfaces of three-dimensional topological insulators support Dirac fermions with a single-valley band dispersion. In the presence of disorder they experience weak antilocalization, which has been observed in recent transport experiments. In this work we conduct a comparative theoretical study of the weak antilocalization in HgTe quantum wells and topological surface states. The difference between these two single-valley systems comes from a finite band gap (effective Dirac mass) in HgTe quantum wells in contrast to gapless (massless) surface states in topological insulators. The finite effective Dirac mass implies a broken internal symmetry, leading to suppression of the weak antilocalization in HgTe quantum wells at times larger than certain t_M, inversely proportional to the Dirac mass. This corresponds to the opening of a relaxation gap 1/t_M in the Cooperon diffusion mode which we obtain from the Bethe-Salpeter equation including relevant spin degrees of freedom. We demonstrate that the relaxation gap exhibits an interesting nonmonotonic dependence on both carrier density and band gap, vanishing at a certain combination of these parameters. The weak-antilocalization conductivity reflects this nonmonotonic behavior which is unique to HgTe QWs and absent for topological surface states. On the other hand, the topological surface states exhibit specific weak-antilocalization magnetoconductivity in a parallel magnetic field due to their exponential decay in the bulk.
description: 14 pages, 10 figures, version as published
Long spin relaxation times in a transition metal atom in direct contact to a metal substrate
Creators: name: Hermenau, Jan
name: Ternes, Markus
name: Steinbrecher, Manuel
name: Wiesendanger, Roland
name: Wiebe, Jens
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Long spin relaxation times are a prerequisite for the use of spins in data storage or nanospintronics technologies. An atomic-scale solid-state realization of such a system is the spin of a transition metal atom adsorbed on a suitable substrate. For the case of a metallic substrate, which enables directly addressing the spin by conduction electrons, the experimentally measured lifetimes reported to date are on the order of only hundreds of femtoseconds. Here, we show that the spin states of iron atoms adsorbed directly on a conductive platinum substrate have an astonishingly long spin relaxation time in the nanosecond regime, which is comparable to that of a transition metal atom decoupled from the substrate electrons by a thin decoupling layer. The combination of long spin relaxation times and strong coupling to conduction electrons implies the possibility to use flexible coupling schemes in order to process the spin-information.
Additional file 4 of Transcriptome and metabolome analysis reveals anthocyanin biosynthesis pathway associated with ramie (Boehmeria nivea (L.) Gaud.) leaf color formation
Creators: name: Feng, Xinkang
name: Gao, Gang
name: Yu, Chunming
name: Zhu, Aiguo
name: Chen, Jikang
name: Chen, Kunmei
name: Wang, Xiaofei
name: Abubakar, Aminu Shehu
name: Chen, Ping
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Plant Biology

description: Additional file 4 Fig. S2: MA map and Volcano map. (A) MA map of differential expression; (B) Volcano map of differential expression.
Automated supervised classification of variable stars I. Methodology
Creators: name: Debosscher, J.
name: Sarro, L. M.
name: Aerts, C.
name: Cuypers, J.
name: Vandenbussche, B.
name: Garrido, R.
name: Solano, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The fast classification of new variable stars is an important step in making them available for further research. Selection of science targets from large databases is much more efficient if they have been classified first. Defining the classes in terms of physical parameters is also important to get an unbiased statistical view on the variability mechanisms and the borders of instability strips. Our goal is twofold: provide an overview of the stellar variability classes that are presently known, in terms of some relevant stellar parameters; use the class descriptions obtained as the basis for an automated `supervised classification' of large databases. Such automated classification will compare and assign new objects to a set of pre-defined variability training classes. For every variability class, a literature search was performed to find as many well-known member stars as possible, or a considerable subset if too many were present. Next, we searched on-line and private databases for their light curves in the visible band and performed period analysis and harmonic fitting. The derived light curve parameters are used to describe the classes and define the training classifiers. We compared the performance of different classifiers in terms of percentage of correct identification, of confusion among classes and of computation time. We describe how well the classes can be separated using the proposed set of parameters and how future improvements can be made, based on new large databases such as the light curves to be assembled by the CoRoT and Kepler space missions.
description: This paper has been accepted for publication in Astronomy and Astrophysics (reference AA/2007/7638) Number of pages: 27 Number of figures: 12
Anobium punctatum
Creators: name: Zahradník, Petr
name: Demetriou, Jakovos
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Anobiidae
Anobium
Anobium punctatum

description: Anobium punctatum (DeGeer, 1774)
= domesticum (Geoffroy, 1785)
= striatum (Olivier, 1790)
Baudi di Selve 1874: 329; Zahradník 2007a: 339; Zahradník 2016b: 94.
Distribution. P: AB AG AU AZ BE BU BY CH CI CR CY CZ DE EG EN FA FI FR GB GE GG GR HU IC i IN IR IS IT LA LT MD MO MR NL NR PL PT RO RU SK SL SP SV SZ TR TU A: AS NZ E: SF SVH ZA N: CN DEA US Nt: AY CL MX. Cosmopolitan (White 1982; Hagstrum & Subramanyam 2009; Zahradník 2007a, 2016a), originally a European species.
description: Published as part of Zahradník, Petr & Demetriou, Jakovos, 2023, A review of the Ptinidae (Coleoptera: Bostrichoidea) of Cyprus, including new faunistic records and the description of a new species, pp. 243-265 in Zootaxa 5306 (2) on page 247, DOI: 10.11646/zootaxa.5306.2.5, http://zenodo.org/record/8061315
Chirally motivated K^- nuclear potentials
Creators: name: Cieplý, A.
name: Friedman, E.
name: Gal, A.
name: Gazda, D.
name: Mareš, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: In-medium subthreshold KbarN scattering amplitudes calculated within a chirally motivated meson-baryon coupled-channel model are used self consistently to confront K^- atom data across the periodic table. Substantially deeper K^- nuclear potentials are obtained compared to the shallow potentials derived in some approaches from threshold amplitudes, with Re V_{chiral} = -(85+/-5) MeV at nuclear matter density. When KbarNN contributions are incorporated phenomenologically, a very deep K^- nuclear potential results, Re V_{chiral+phen.} = -(180+/-5) MeV, in agreement with density dependent potentials obtained in purely phenomenological fits to the data. Self consistent dynamical calculations of K^- nuclear quasibound states are reported and discussed.
description: extended discussion, unchanged results and conclusions, accepted by PLB
Klein Paradox for Optical Scattering from Excited Targets
Creators: name: Panella, O.
name: Srivastava, Y. N.
name: Widom, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The well known Klein paradox for the relativistic Dirac wave equation consists in the computation of possible ``negative probabilities'' induced by certain potentials in some regimes of energy. The paradox may be resolved employing the notion of electron-positron pair production in which the number of electrons present in a process can increase. The Klein paradox also exists in Maxwell's equations viewed as the wave equation for photons. In a medium containing ``inverted energy populations'' of excited atoms, e.g. in a LASER medium, one may again compute possible ``negative probabilities''. The resolution of the electromagnetic Klein paradox is that when the atoms decay, the final state may contain more photons then were contained the initial state. The optical theorem total cross section for scattering photons from excited state atoms may then be computed as negative within a frequency band with matter induced amplification.
description: RevTex4, 4pages. Preprint version of a paper published by IJMPA
Mapping low frequency carbon radio recombination lines towards Cassiopeia A at 340, 148, 54 and 43 MHz
Creators: name: Salas, Pedro
name: Oonk, J. B. Raymond
name: van Weeren, Reinout J.
name: Wolfire, Mark G.
name: Emig, Kimberly L.
name: Toribio, M. Carmen
name: Röttgering, Huub J. A.
name: Tielens, Alexander G. G. M.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Quantitative understanding of the interstellar medium requires knowledge of its physical conditions. Low frequency carbon radio recombination lines (CRRLs) trace cold interstellar gas, and can be used to determine its physical conditions (e.g., electron temperature and density). In this work we present spatially resolved observations of the low frequency ($\leq390$ MHz) CRRLs centered around C$268α$, C$357α$, C$494α$ and C$539α$ towards Cassiopeia A on scales of $\leq1.2$ pc. We compare the spatial distribution of CRRLs with other ISM tracers. This comparison reveals a spatial offset between the peak of the CRRLs and other tracers, which is very characteristic for photodissociation regions and that we take as evidence for CRRLs being preferentially detected from the surfaces of molecular clouds. Using the CRRLs we constrain the gas electron temperature and density. These constraints on the gas conditions suggest variations of less than a factor of two in pressure over $\sim1$ pc scales, and an average hydrogen density of $200$-$470$ cm$^{-3}$. From the electron temperature and density maps we also constrain the ionized carbon emission measure, column density and path length. Based on these, the hydrogen column density is larger than $10^{22}$ cm$^{-2}$, with a peak of $\sim4\times10^{22}$ cm$^{-2}$ towards the South of Cassiopeia A. Towards the southern peak the line of sight length is $\sim40$ pc over a $\sim2$ pc wide structure, which implies that the gas is a thin surface layer on a large (molecular) cloud that is only partially intersected by Cassiopeia A. These observations highlight the utility of CRRLs as tracers of low density extended HI and CO-dark gas halo's around molecular clouds.
description: 18 pages, 15 figures, 4 tables, accepted by MNRAS