cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Unirational Components of the Strata of Genus $11$ Curves with Several Pencils of Degree $6$ in $\mathcal{M}_{11}$
Creators: name: Keneshlou, Hanieh
name: Schreyer, Frank-Olaf
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2021

description: We show that the strata $\mathcal{M}_{11,6}(k)\subset \mathcal{M}_{11,6}$ of $ 6-$gonal curves of genus $11$, equipped with $k$ mutually independent and type I pencils of degree six, have a unirational irreducible component for $5\leq k\leq 9$. The unirational families arise from degree $9$ plane curves with $4$ ordinary triple and $5$ ordinary double points that dominate an irreducible component of expected dimension. We will further show that the family of degree $8$ plane curves with $10$ ordinary double points covers an irreducible component of excess dimension in $\mathcal{M}_{11,6}(10)$.
description: DOCUMENTA MATHEMATICA, Vol 26 (2021), p. 415-438
Da prática à produção do conhecimento: bibliotecas e biblioteconomia pré-científica
Creators: name: Tanus, Gabrielle Francinne
Publisher: name: figshare
Year: 2018
Subjects: subject: 80706 Librarianship
subject: FOS: Media and communications
subject: Library and Information Studies

description: A indissociável relação entre as bibliotecas e a Biblioteconomia conduz a uma reconstituição da história dessas instituições, começando pelo período mais remoto, a Antiguidade. Momento este de nascimento da escrita, dos primeiros registros do conhecimento, e, por conseguinte, dos primeiros acervos. Tanto neste momento, quanto no posterior, a Idade Média, as práticas no ambiente da biblioteca antecedem as teorias ou estruturas de pensamento sistematizadas. O desejo em custodiar e conservar é comum tanto nas bibliotecas da Antiguidade como nas bibliotecas da Idade Média, o que possibilita uma aproximação desses distintos momentos sob a designação de uma Biblioteconomia pré-científica. Para tanto, convoca-se a partir de uma pesquisa bibliográfica diversos autores que abordam a história da biblioteca, particularmente, vinculada aqueles dois momentos. Acredita-se que, perscrutar este largo período da história e da qual a Biblioteconomia faz parte, possibilitaria uma maior compreensão da mesma, bem como de suas práticas exercidas nas bibliotecas, em especial, na Antiguidade e na Idade Média.
Computational and numerical aspects of full waveform seismic inversion
Creators: name: Burgess, Timothy James
Publisher: name: Imperial College London
Year: 2017

description: Full-waveform inversion (FWI) is a nonlinear optimisation procedure, seeking to match synthetically-generated seismograms with those observed in field data by iteratively updating a model of the subsurface seismic parameters, typically compressional wave (P-wave) velocity. Advances in high-performance computing have made FWI of 3-dimensional models feasible, but the low sensitivity of the objective function to deeper, low-wavenumber components of velocity makes these difficult to recover using FWI relative to more traditional, less automated, techniques. While the use of inadequate physics during the synthetic modelling stage is a contributing factor, I propose that this weakness is substantially one of ill-conditioning, and that efforts to remedy it should focus on the development of both more efficient seismic modelling techniques, and more sophisticated preconditioners for the optimisation iterations. I demonstrate that the problem of poor low-wavenumber velocity recovery can be reproduced in an analogous one-dimensional inversion problem, and that in this case it can be remedied by making full use of the available curvature information, in the form of the Hessian matrix. In two or three dimensions, this curvature information is prohibitively expensive to obtain and store as part of an inversion procedure. I obtain the complete Hessian matrices for a realistically-sized, two-dimensional, towed-streamer inversion problem at several stages during the inversion and link properties of these matrices to the behaviour of the inversion. Based on these observations, I propose a method for approximating the action of the Hessian and suggest it as a path forward for more sophisticated preconditioning of the inversion process.
Fractionally quantized Berry's phase in an anisotropic magnet on the Kagome lattice
Creators: name: Kawarabayashi, Tohru
name: Ishii, Kota
name: Hatsugai, Yasuhiro
Publisher: name: arXiv
Year: 2018
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A fractionally quantized Berry phase is examined numerically in an anisotropic spin-1/2 XXZ model on the Kagome lattice. It is shown that the Berry phase has a fractionally quantized and non-zero value when an anisotropy is increased, which is consistent with the emergence of the tripartite entangled plaquette phase discussed by J. Carrasquilla et al. [Phys. Rev. B96, 054405 (2017)].
description: 3 pages, 3 figures
Complete Intersections of Quadrics and Complete Intersections on Segre Varieties with Common Specializations
Creators: name: Peters, Chris
name: Sterk, Hans
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2021

description: We investigate whether surfaces that are complete intersections of quadrics and complete intersection surfaces in the Segre embedded product $\mathbf{P}^1\times \mathbf{P}^k\into \mathbf{P}^{2k+1}$ can belong to the same Hilbert scheme. For $k=2$ there is a classical example; it comes from K3 surfaces in projective $5$-space that degenerate into a hypersurface on the Segre threefold. We show that for $k\ge 3$ there is only one more example. It turns out that its (connected) Hilbert scheme has at least two irreducible components. We investigate the corresponding local moduli problem.
description: DOCUMENTA MATHEMATICA, Vol 26 (2021), p. 439-464
Error Thresholds in Presence of Epistatic Interactions
Creators: name: Herrera-Martí, David A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Models for viral populations with high replication error rates (such as RNA viruses) rely on the quasispecies concept, in which mutational pressure beyond the so-called "Error Threshold" leads to a loss of essential genetic information and population collapse, an effect known as the "Error Catastrophe". We explain how crossing this threshold, as a result of increasing mutation rates, can be understood as a second order phase transition, even in the presence of lethal mutations. In particular, we show that, in fitness landscapes with a single peak, this collapse is equivalent to a ferro-paramagnetic transition, where the back-mutation rate plays the role of the external magnetic field. We then generalize this framework to rugged fitness landscapes, like the ones that arise from epistatic interactions, and provide numerical evidence that there is a transition from a high average fitness regime to a low average fitness one, similarly to single-peaked landscapes. The onset of the transition is heralded by a sudden change in the susceptibility to variations in the mutation rate. We use insight from Replica Symmetry Breaking mechanisms in spin glasses, in particular by considering the fluctuations of the genotype similarity distribution as the order parameter.
description: 15 pages, 9 figures. Phys. Rev. E 110, 054412 (Published 18 November, 2024)
Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
Creators: name: Singh, Dheeraj Kumar
name: Akbari, Alireza
name: Majumdar, Pinaki
Publisher: name: arXiv
Year: 2018
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Impurity scattering is found to lead to quasi-one dimensional nanoscale modulation of the local density of states in the iron pnictides and chalcogenides. This `quasiparticle interference' feature is remarkably similar across a wide variety of pnictide and chalcogenide phases, suggesting a common origin. We show that a unified understanding of the experiments can be obtained by simply invoking a four-fold symmetry breaking $d_{xz}-d_{yz}$ orbital splitting, of a magnitude already suggested by the experiments. This can explain the one-dimensional characteristics in the local density of states observed in the orthorhombic nematic, tetragonal paramagnetic, as well as the spin-density wave and superconducting states in these materials.
description: 6 pages, 5 figures (accepted in PRB Rapid Communication)
A case of strong non linearity: intermittency in highly turbulent flows
Creators: name: Pomeau, Yves
name: Berre, Martine Le
name: Lehner, Thierry
Publisher: name: arXiv
Year: 2018
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: It has long been suspected that flows of incompressible fluids at large or infinite Reynolds number (namely at small or zero viscosity) may present finite time singularities. We review briefly the theoretical situation on this point. We discuss the effect of a small viscosity on the self-similar solution of the Euler equations for inviscid fluids. Then we show that single point records of velocity fluctuations in the Modane wind tunnel display correlations between large velocities and large accelerations in full agreement with scaling laws derived from Leray's equations (1934) for self-similar singular solutions of the fluid equations. Conversely those experimental velocity-acceleration correlations are contradictory to the Kolmogorov scaling laws.
Théagène et Chariclée
Creators: name: Duché de Vancy, Joseph-François
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2021
Subjects: Livret d'Opéra
Tragédie en musique
Académie royale de musique
Première génération d'opéras français
Paris

description: Tragédie représentée par l'Académie royale de musique en 1695. Les paroles sont de Joseph-François Duché de Vancy et la musique de Henry Desmaret. Le livret est consultable de manière publique par un portail qui donne accès simultanément au fac-similé, à une version du corpus qui respecte la graphie d’origine et une version du corpus normalisé exploitable à travers toutes les fonctionnalités de la plateforme TXM : http://fanum-txm.univ-fcomte.fr/txm/?command=edition&path=/LIVRETSOPERA&editions=facs,originale,normalis%C3%A9e&textid=25_THEAGENE ET CARICLEE
description: Bibliographic citation: Cote (ELLIADD) : 25_THEAGENE ET CARICLEE
description: URL TXM : http://fanum-txm.univ-fcomte.fr/txm/?command=edition&path=/LIVRETSOPERA&editions=facs,originale,normalis%C3%A9e&textid=25_THEAGENE ET CARICLEE
Probing Elastic Isotropy in Entropy Stabilized Transition Metal Oxides: Experimental Estimation of Single Crystal Elastic Constants from Polycrystalline Materials
Creators: name: Bhaskar, Lalith Kumar
name: Moharana, Niraja
name: Holz, Hendrik
name: Ramachandramoorthy, Rajaprakash
name: Kumar, K. C. Hari
name: Kumar, Ravi
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Single Crystal Elastic Constants (SECs) are pivotal for understanding material deformation, validating interatomic potentials, and enabling crucial material simulations. The entropy stabilized oxide showcases intriguing properties, underscoring the necessity for the determination of precise SECs to establish reliable interatomic potential and unlock its full potential using simulations. This study presents an innovative methodology for estimating SECs from polycrystalline materials, requiring only two diffraction elastic constants and isotropic elastic constants for crystals with cubic symmetry. Validation using phase-pure nickel demonstrated good agreement with existing literature values, with a maximum 11.5% deviation for $C_{12}$ values. Extending the methodology to [(MgNiCoCuZn)O], SECs were calculated: 219 GPa for $C_{11}$, 116 GPa for $C_{12}$, and 51 GPa for $C_{44}$. Comparison with literature-reported values from DFT calculations revealed a significant divergence, ranging from 25% to 59% in the bulk and shear modulus calculated using the Voigt-Reuss-Hill average. To comprehend this disparity, we conducted DFT calculations and thoroughly examined the factors influencing these values. This study not only introduces a straightforward and dependable SEC estimation methodology but also provides precise experimental SEC values for [(MgNiCoCuZn)O] entropy stabilized oxides at ambient conditions, crucial for developing accurate interatomic potentials in future research.
Cold Dark Matter Models with a Cosmological Constant
Creators: name: Liddle, Andrew R
name: Lyth, David H
name: Viana, Pedro T P
name: White, Martin
Publisher: name: arXiv
Year: 1995
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use linear and quasi-linear perturbation theory to analyse cold dark matter models of structure formation in spatially flat models with a cosmological constant. Both a tilted spectrum of density perturbations and a significant gravitational wave contribution to the microwave anisotropy are allowed as possibilities. We provide normalizations of the models to microwave anisotropies, as given by the four-year {\it COBE} observations, and show how all the normalization information for such models, including tilt, can be condensed into a single fitting function which is independent of the value of the Hubble parameter. We then discuss a wide variety of other types of observations. We find that a very wide parameter space is available for these models, provided $Ω_0$ is greater than about 0.3, and that large-scale structure observations show no preference for any particular value of $Ω_0$ in the range 0.3 to 1.
description: 11 pages LaTeX file with two figures incorporated (uses mn.sty and epsf). Also available by e-mailing ARL, or by WWW at http://star-www.maps.susx.ac.uk/papers/lsstru_papers.html (UK) or http://physics7.berkeley.edu/cmbserve/papers/lambda.html (US). Final version, to appear MNRAS. No major changes to the conclusions
Hecke $L$-Functions and Fourier Coefficients of Covering Eisenstein Series
Creators: name: Gao, Fan
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2021

description: We consider in this paper covering groups and Fourier coefficients of Eisenstein series for induced representations from certain distinguished theta representations. It is shown that one has global factorization of such Fourier coefficients, and the local unramified Whittaker function at the identity can be computed from the local scattering matrices. For a special family of covering groups of the general linear groups, we show that the Fourier coefficients of such Eisenstein series are reciprocals of Hecke $L$-functions, which recovers an earlier result by Suzuki for Kazhdan-Patterson covering groups. We also consider covers of the symplectic group and carry out a detailed analysis in the rank-two case.
description: DOCUMENTA MATHEMATICA, Vol 26 (2021), p. 465-522
Aspects of stability of the toroidal AdS Schwarzschild black hole
Creators: name: Dunn, Jake William
Publisher: name: Imperial College London
Year: 2018

description: In this thesis various aspects about the dynamical stability of the toroidally symmetric Schwarzschild AdS black hole are discussed and proven. The first chapter of the thesis is a literature review. This covers the key relevant results within the area and provides context for the results of the later chapters. The second chapter concerns the Klein-Gordon equation with Dirichlet, Neumann and Robin boundary conditions on the exterior of the toroidally symmetric Schwarzschild AdS black hole. Through the vector field method, energy estimates, and degenerating Morawetz estimates are proven. From these it is seen that the energy of the solutions on these spacetimes are bounded and decay polynomially in time. Furthermore, it is shown that there exist null geodesics on this spacetime remain exterior to the event horizon boundary for arbitrary coordinate time. Through a Gaussian beam argument, it follows that the degeneration in the Morawetz estimates is necessary. The third chapter proves the non-linear stability of the toroidally symmetric Schwarzschild AdS black hole as a solution to the AdS-Einstein--Klein-Gordon system within the class of square toroidal symmetries where the field satisfies Dirichlet or Neumann boundary conditions. This is done through establishing wellposedness of the system in a region near null infinity. Then for initial data `sufficiently small' it is shown through bootstrap arguments that the energy remains bounded by the initial data on the regular region exterior to the black hole. This is then used to establish the orbital stability of the spacetime. Then through the vector field method, exponential decay of the field on the regular region exterior to the black hole is established. From this the asymptotic stability follows. Finally, a vacuum stability result is established in the toroidal symmetry class where the periods of the torus are allowed to vary.
Study on the resonant parameters of $Y(4220)$ and $Y(4390)$
Creators: name: Zhang, Jielei
name: Yuan, Limin
name: Wang, Rumin
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Many vector charmonium-like states have been reported recently in the cross sections of $e^+e^- \rightarrow ωχ_{c0}$, $π^{+}π^{-}h_c$, $π^{+}π^{-}J/ψ$, $π^{+}π^{-}ψ(3686)$ and $π^{+}D^{0}D^{*-}+c.c.$ To better understand the nature of these states, a combined fit is performed to these cross sections by using three resonances $Y(4220)$, $Y(4390)$ and $Y(4660)$. The resonant parameters for the three resonances are obtained. We emphasize that two resonances $Y(4220)$ and $Y(4390)$ are sufficient to explain these cross sections below 4.6 GeV. The lower limits of $Y(4220)$ and $Y(4390)$'s leptonic decay widths are also determined to be $(36.4\pm2.0\pm4.2)$ and $(123.8\pm6.5\pm9.0)$ eV.
Procellaria Linnaeus, 1758, gen. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Procellariiformes
Procellariidae
Procellaria

description: Procellaria [gen. nov.]
Rostrum edentulum, subcompressum: Mandibulis aequalibus: superiore apice adunca; inferiore apice compres- so-canaliculata.
Nares cylindro supra basin rostri decumbente, truncato.
Pedes palmati: ungue postico sessili absque digito.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 131, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
A Change Language for Ontologies and Knowledge Graphs
Creators: name: Hegde, Harshad
name: Vendetti, Jennifer
name: Goutte-Gattat, Damien
name: Caufield, J Harry
name: Graybeal, John B
name: Harris, Nomi L
name: Karam, Naouel
name: Kindermann, Christian
name: Matentzoglu, Nicolas
name: Overton, James A
name: Musen, Mark A
name: Mungall, Christopher J
Publisher: name: arXiv
Year: 2024
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Ontologies and knowledge graphs (KGs) are general-purpose computable representations of some domain, such as human anatomy, and are frequently a crucial part of modern information systems. Most of these structures change over time, incorporating new knowledge or information that was previously missing. Managing these changes is a challenge, both in terms of communicating changes to users, and providing mechanisms to make it easier for multiple stakeholders to contribute.
 To fill that need, we have created KGCL, the Knowledge Graph Change Language, a standard data model for describing changes to KGs and ontologies at a high level, and an accompanying human-readable controlled natural language. This language serves two purposes: a curator can use it to request desired changes, and it can also be used to describe changes that have already happened, corresponding to the concepts of "apply patch" and "diff" commonly used for managing changes in text documents and computer programs. Another key feature of KGCL is that descriptions are at a high enough level to be useful and understood by a variety of stakeholders--for example, ontology edits can be specified by commands like "add synonym 'arm' to 'forelimb'" or "move 'Parkinson disease' under 'neurodegenerative disease'".
 We have also built a suite of tools for managing ontology changes. These include an automated agent that integrates with and monitors GitHub ontology repositories and applies any requested changes, and a new component in the BioPortal ontology resource that allows users to make change requests directly from within the BioPortal user interface.
 Overall, the KGCL data model, its controlled natural language, and associated tooling allow for easier management and processing of changes associated with the development of ontologies and KGs.
Statistical lensing by galactic discs
Creators: name: Blain, Andrew W.
name: Moeller, Ole
name: Maller, Ariyeh H.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The high-magnification gravitational lensing cross-section of a galaxy is enhanced significantly if a baryonic disc is embedded in its dark matter halo. We investigate the effects of a population of such disks on the probability of detecting strongly lensed images of distant galaxies and quasars. The optical depth to lensing is always more than doubled. The effects are particularly significant at magnifications greater than about 50, for which the optical depth typically increases by a factor greater than 5. If either the fraction of discs or the typical disc-to-halo mass ratio increases with redshift, then the optical depth is expected to be increased even further. Obscuration by dust in the lensing disc is expected to counteract the associated enhanced magnification bias for surveys in the optical waveband, but not in the radio and millimetre/submillimetre wavebands. The presence of galactic discs should hence lead to a significant increase in the number of lensed galaxies and quasars detected in both radio- and millimetre/submillimetre-selected surveys. An increase by a factor of about 3 is expected, enhancing the strong case for millimetre/submillimetre-wave lens surveys using the next generation of ground-based telescopes and the FIRST and Planck Surveyor space missions.
description: 10 pages, 7 figures, in press at MNRAS. Replaced with final proof version
Portais de periódicos: Acesso, visibilidade e suporte aos editores
Creators: name: Santos, Gildenir Carolino
Publisher: name: figshare
Year: 2018
Subjects: subject: 80704 Information Retrieval and Web Search
subject: FOS: Media and communications
subject: 80609 Information Systems Management
subject: FOS: Computer and information sciences
subject: Library and Information Studies
subject: 80706 Librarianship
subject: 80505 Web Technologies (excl. Web Search)

description: Desde o surgimento dos primeiros periódicos no século XVII, o número de publicações periódicas no mundo tem aumentado cada vez mais. Esses dados podem ser comprovados por meio de consulta no indexador Ulrich´s que aponta, a partir do século XVII até o atual momento, a existência em torno de mais de 300 mil títulos em todo planeta. Nessa avalanche de publicações periódicas, nascem os portais de periódicos, em que softwares aperfeiçoados, especificamente o Open Journal System (OJS), são adotados por muitas instituições brasileiras, tornando possível o gerenciamento do fluxo editorial e o acompanhamento por parte do editor de todo o processo de editoração à publicação. Esses periódicos, que têm seu nascimento impulsionado na grande maioria nas universidades (federais, estaduais e privadas), faz com que bibliotecários, pesquisadores, professores e editores se capacitem para assumir a função de editor gerencial de periódicos de suas áreas, e dessa forma aproximar os seus conhecimentos à produção científica. Grande parte desses periódicos, nato digital, advindos do Movimento do Acesso Aberto, passam a se qualificar no meio acadêmico, e nos mais notáveis indexadores nacionais e internacionais. Por esse motivo, ganham visibilidade, se massificam por meio do marketing digital nas redes sociais e se aperfeiçoam nos sistemas executados por plug-ins que objetivam dar destaque em rankings customizados em portais de periódicos. Assim, todo o conhecimento editorial percebido pelos editores, que promovem o acesso e gerenciamento aos portais de periódicos especializados e multidisciplinares, tem sido fortemente engajado por ações de boas práticas, e movimentos profissionais que efetivam a participação dos editores em eventos ligados à área possibilitando a geração de novos conhecimentos. Finalizando esse embasamento, iremos apresentar também eventos que estão promovendo a expansão dos portais de periódicos institucionais como ABEC Meeting e SciELO 20 anos, consequentemente a Rede Nacional de Portais de Periódicos.
title: ADCO, Cartulaire de l'abbaye de Saint-Seine (XIIIe siècle), Cart. 165 (10 H 6, ms. 139), 354 pages, f. 0064
Creators: name: de la Côte d'Or, Archives départementales
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2009
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire

description: Cartulaire de l'abbaye de Saint-Seine (XIIIe siècle), Archives départementales de la Côte-d'Or, Cart. 165 (10 H 6, ms. 139), 354 pages, f. 0064, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire de l'abbaye de Saint-Seine (XIIIe siècle), Archives départementales de la Côte-d'Or, Cart. 165 (10 H 6, ms. 139), 354 pages, f. 0064, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Saint-Seine
description: Provenance: http://www.wikidata.org/entity/Q2820709
Monitoring of the Einstein Cross with the Nordic Optical Telscope
Creators: name: Oestensen, R.
name: Refsdal, S.
name: Stabell, R.
name: Teuber, J.
name: Emanuelsen, P. I.
name: Festin, L.
name: Florentin-Nielsen, R.
name: Gahm, G.
name: Gullbring, E.
name: Hjorth, J.
name: Jablonski, M.
name: Jaunsen, A. O.
name: Kaas, A. A.
name: Karttunen, H.
name: Kotilainen, J.
name: Laurikainen, E.
name: Lindgren, H.
name: Maehoenen, P.
name: Nilsson, K.
name: Olofsson, G.
name: Olsen, Oe.
name: Pettersen, B. R.
name: Piirola, V.
name: Soerensen, A. N.
name: Takalo, L.
name: Thomsen, B.
name: Valtaoja, E.
name: Vestergaard, M.
name: Vianborg, T. av
Publisher: name: arXiv
Year: 1995
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report results from five years of monitoring of the Einstein Cross (Q 2237+0305) with the Nordic Optical Telescope. The photometry, mainly in the R and I bands, has been performed by a PSF fitting and `cleaning' procedure, in which the four image components as well as the lens galaxy and its nucleus are iteratively removed. The resulting lightcurves exhibit several microlensing features; one event may have a timescale as short as 14 days. Variations of timescales of several years are found in all four images. This becomes even more convincing when our data are combined with data published for 1986-89. No clear high amplification event was observed during the period. A brightening of all four components during 1994 is interpreted as intrinsic variation.
description: 7 pages. To appear in A&A 1996
Symmetries of the Dirac quantum walk and emergence of the de Sitter group
Creators: name: Apadula, Luca
name: Bisio, Alessandro
name: D'Ariano, Giacomo Mauro
name: Perinotti, Paolo
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantum walk describes the discrete unitary evolution of a quantum particle on a discrete graph. Some quantum walks, referred to as the Weyl and Dirac quantum walks, provide a description of the free evolution of relativistic quantum fields in a regime where the wave-vectors involved in the particle state are small. The clash between the intrinsic discreteness of quantum walks and the symmetries of special relativity can be resolved by rethinking the notion of a change of inertial reference frame. We give here a definition of the latter that avoids a pre-defined space-time geometry, in terms of a change of values of the constants of motion that leaves the walk operator unchanged. Starting from the family of 1+1 dimensional Dirac quantum walks with all possible values of the mass parameter, we introduce a unique walk encompassing the latter as an extra degree of freedom, and we derive its group of changes of inertial frames. This symmetry group contains a non linear realization of $SO^+(2,1) \ltimes \mathbb{R}^3$; since one of the two space-like dimensions does not correspond to an actual spatial degree of freedom but rather the mass, we interpret it as a 2+1 dimensional de-Sitter group. This group group contains also a non-linear realisation of the proper orthochronous Poincaré group $SO^+(1,1) \ltimes \mathbb{R}^2$ in 1+1 dimension, as the ones considered within the framework of doubly special relativity, which recovers the usual relativistic symmetry of the Dirac Equation in the limit of small wave-vectors and masses. Surprisingly, if one considers the Dirac walk with a fixed value of the mass parameter, the group of allowed changes of reference frame does not have a consistent interpretation in the relativistic limit of small wave-vectors.
description: 9 pages, 4 figures
Editorial: Múltiplos cenários da Ciência da Informação e da Biblioteconomia brasileira
Creators: name: Santos, Gildenir Carolino
name: Ferreira, Danielle Thiago
Publisher: name: figshare
Year: 2018
Subjects: subject: 80706 Librarianship
subject: FOS: Media and communications
subject: Library and Information Studies

description: Chegamos à edição do volume 16, número 3, correspondente à periodicidade de setembro a dezembro de 2018, sob a temática “Múltiplos cenários da Ciência da Informação e da Biblioteconomia brasileira”. Nessa edição contamos com oito Artigos; um Artigo de pesquisa; um Relato de experiência e uma Resenha. A relevância da presente temática está em apontar o pensamento dos múltiplos cenários inseridos nas áreas da Ciência da Informação e da Biblioteconomia, especialidade da nossa publicação. Assim, teremos como subtemas sobre a produção do conhecimento, governança de dados, das interfaces da leitura documentária no âmbito jurídico, dominação patriarcal presente nas músicas populares discutidas e reescritas na página Arrumando Letras na mídia social Facebook, significados e contextos, o olhar para o desenvolvimento sustentável para a biblioteca escolar, o documento fotográfico como fator para a geração de conhecimento, considerações sobre os projetos de lei para acessibilidade na web no Brasil, a leitura vista pela análise das Bibliotecas Transcol de Vila Velha por meio da ferramenta Servqual e fecharemos com a verificação dos processos de negócio, a gestão de documentos e os fluxos documentais.
Geostatistical facies modelling of cyclicity and rhythmicity in shallow-marine reservoirs
Creators: name: Le Blévec, Thomas
Publisher: name: Imperial College London
Year: 2018

description: This work presents a new geostatistical approach aimed at incorporating more accurate geological input into existing Earth modelling tools. These tools play a key role in petroleum reservoir and mining deposit modelling workflows as they are the basis for the estimation of resource recovery and its associated uncertainty. Conventional geostatistics generate facies successions that are statistically identical along one direction or its opposite. This impedes the modelling of facies ordering, also called facies cyclicity, which is often characterized in shallow-marine carbonate and siliciclastic reservoirs by shallowing upward facies cycles. Cyclicity is often coupled with another geological characteristic of sedimentary sequences, which is that facies usually appear repeatedly at almost constant stratigraphic intervals, a feature called facies rhythmicity. The principal result of this thesis is a new method that can quantify and simultaneously model facies cyclicity and rhythmicity. Cyclicity is quantified using transition probability analysis, while rhythmicity is quantified using two point statistical tools such as transiograms. The new method is an extension of the approach known as Pluri-Gaussian Simulations, which is significantly improved by developing new periodic covariances and a co-regionalization model with spatial asymmetry. The method was tested on case studies of shallow marine deposits such as the Latemar carbonate platform in Italy and the Blackhawk Formation siliciclastic shoreface deposits in the Book Cliffs, USA. The choice of case studies was dictated by the desire to model a range of geological patterns including different styles of diagenesis, the presence of erosional surfaces, and non-stationarity. This was also an opportunity to evaluate the method in relation with established geological concepts such as sequence stratigraphy or Walther's Law. By generating more realistic three-dimensional geological Earth models, the method has the potential to significantly improve the quality of hydrocarbon and mining resource estimates and the quantification of their associated uncertainty.
Procellaria pelagica Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Procellariiformes
Procellariidae
Procellaria
Procellaria pelagica

description: Procellaria pelagica [spec. nov.]
P. nigra, uropygio albo. Fn. svec. 249. Act. Stockh. 1745. p. 93. t ...
Peteril. Clus. exot. 368. Damp. itin. 3. p. 97. Alb. av. 3. p. 87. t. 92. Edw. av. 90. t. 90. f. 1.
Hirundo marina major apus, rostro adunco. Barr. aequin. 134.
Larus minimus, naribus tubulosis. Catesb. carol. 3. p. 14. t. 14.
Fregata marina apus subtus alba, superne nigra. Barr. av. 73.
Habitat in albo Oceano.
Procellariae aves pelagicae sunt, nec ad continentis littora conspiciuntur, expositae omnibus procellis.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 131, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Starburst or Seyfert? Using near-infrared spectroscopy to measure the activity in composite galaxies
Creators: name: Hill, Tanya L.
name: Heisler, Charlene A.
name: Sutherland, Ralph
name: Hunstead, Richard W.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present near-infrared spectra for a sample of galaxies with ambiguous optical emission line ratios. These galaxies fall between starbursts and Seyferts in the usual optical diagnostic diagrams. We find a similar result with the near-infrared emission line ratios, which suggests that the galaxies are composite, containing both a starburst and AGN component. Furthermore, CO absorption, produced in late-type stars, is detected within the sample, although at a weaker level than is typical for starburst galaxies. We conclude that the CO feature is being diluted by a contribution from an AGN, thereby confirming the composite nature of these galaxies.
description: 38 pages, 13 embedded ps figures, to appear in AJ(Jan 1999)
Search for same-charge top-quark pair production in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search for the production of top-quark pairs with the same electric charge ($tt$ or $\bar{t}\bar{t}$) is presented. The analysis uses proton-proton collision data at $\sqrt{s}=13$ TeV, recorded by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb$^{-1}$. Events with two same-charge leptons and at least two $b$-tagged jets are selected. Neural networks are employed to define two selections sensitive to additional couplings beyond the Standard Model that would enhance the production rate of same-sign top-quark pairs. No significant signal is observed, leading to an upper limit on the total production cross-section of same-sign top-quark pairs of 1.6 fb at 95$\%$ confidence level. Corresponding limits on the three Wilson coefficients associated with the ${\cal O}_{tu}^{(1)}$, ${\cal O}_{Qu}^{(1)}$, and ${\cal O}_{Qu}^{(8)}$ operators in the Standard Model Effective Field Theory framework are derived.
description: 52 pages in total, author list starting page 35, 9 figures, 6 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2021-14/
Discrete dislocation plasticity analysis of cyclic loading phenomena
Creators: name: Waheed, Sana
Publisher: name: Imperial College London
Year: 2018

description: Cyclic loading scenarios often arise in real-world situations. In this thesis, planar discrete dislocation plasticity simulations are utilised to provide new insights into the micromechanics of two particular cyclic deformation phenomena: the Bauschinger effect in small-scale confined films and dwell fatigue failure in large aero-engine components. The 2D discrete dislocation plasticity (DDP) model incorporates material heterogeneity and dislocation penetration across interfaces with capabilities to mesh and simulate complex specimens efficiently and accurately. For the Bauschinger effect in small-scale plasticity, an encapsulated film micropillar geometry is used to investigate geometric and temperature effects on cyclic response. A unifying scaling relationship is introduced which, for the first time, incorporates effects of each of source density, dipole nucleation strength, film orientation, film thickness and plastic pre-strain before unloading on the size of the Bauschinger effect. Next, temperature-dependent plastic hysteresis in BCC niobium is shown to be arising from changes in dislocation mobility rather than changes in the extent of dislocation penetration across grain boundaries. Finally, microstructural effects on dwell-sensitivity in dual-phase titanium alloys are investigated. Corroborating evidence in the literature, it is demonstrated that alloy morphology and texture significantly influence microstructural material rate sensitivity. The mechanistic cause of these effects is argued to be changes in dislocation mean free-path and the total amount of slip in the specimen. Comparing DDP results with corresponding crystal plasticity finite element (CPFE) simulations, it is shown that discrete aspects of slip and hardening mechanisms have to be accounted for to capture experimentally observed material rate sensitivity. Overall, this thesis provides increased understanding of dislocation mechanisms operating during the chosen cyclic loading phenomena, highlighting the importance of considering micromechanics for an analysis of both small- and large-scale deformation.
Partially premixed combustion in an optically accessible compression ignition engine
Creators: name: Touloupis, Dimitris Panagiotis
Publisher: name: Imperial College London
Year: 2018

description: This thesis sets out the high-speed imaging and Laser Induced Incandescence (LII) work carried out on the Ricardo Hydra and the Volvo D5 single cylinder optical light duty diesel engines at Imperial College London. A literature review was presented on diesel engine operation strategies along with a review on the optical diagnostic techniques used for the purpose of the present thesis. The experimental work on the Ricardo Hydra optical engine comprises three different experimental campaigns, which investigate three major engine operation strategies, commonly employed by engine manufacturers, namely inlet air dilution, pilot injection and post injection. The analysis identifies combustion patterns and characteristics and describes how these were affected when different operation strategies were employed. The investigation focused on soot emissions formation and their evolution throughout the combustion event. Most importantly, the employed operation strategies were evaluated in regard to their efficiency in reducing engine-out soot emissions. The experimental work on the Volvo D5 optical engine focused on the effect of injection timing and of a close-coupled pilot injection on combustion stratification and soot formation at operating conditions that promote PPC operation. Findings were analysed via means of pressure trace and apparent rate of heat transfer analyses, as well as a series of optical diagnostics techniques, namely high-speed flame natural luminosity imaging, CH* and C2* line-of-sight chemiluminescence, as well as planar Laser Induced Incandescence (pLII). Overall, results suggest that longer ignition delay is a key parameter in lower engine-out soot emissions, which can be achieved by several operating techniques. Longer ignition delay leads to enhanced in-cylinder mixing, which facilitates operation in the Partially Premixed Combustion regime, where fuel-rich areas can be eliminated, and soot formation weakens.
Successful Reorganization of Category-Selective Visual Cortex following Occipito-temporal Lobectomy in Childhood
Creators: name: Liu, Tina
name: Nestor, Adrian
name: Vida, Mark
name: Pyles, John
name: Patterson, Christina
name: Yang, Ying
name: Yang, Fan Nils
name: Freud, Erez
name: Behrmann, Marlene
Publisher: name: Carnegie Mellon University
Year: 2018
Subjects: Neuroscience

description: Investigations of functional (re)organization in children who have undergone large cortical resections offer a unique opportunity to elucidate the nature and extent of cortical plasticity. We report findings from a 3-year investigation of a child, U.D., who underwent surgical removal of the right occipital and posterior temporal lobes at age 6 years 9 months. Relative to controls, post-surgically, U.D. showed age-appropriate intellectual performance and visuoperceptual face and object recognition skills. Using fMRI at five different time points, we observed a persistent hemianopia and no visual field remapping. In category-selective visual cortices, however, object- and scene-selective regions in the intact left hemisphere were stable early on, but regions subserving face and word recognition emerged later and evinced competition for cortical representation. These findings reveal alterations in the selectivity and topography of category-selective regions when confined to a single hemisphere and provide insights into dynamic functional changes in extrastriate cortical architecture.
Spin Response and Collective Modes in Simple Metal Dichalcogenides
Creators: name: Mukherjee, Dibya Kanti
name: Kundu, Arijit
name: Fertig, H. A.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Transition metal dichalcogenide (TMD) monolayers are interesting materials in part because of their strong spin-orbit coupling. This leads to intrinsic spin-splitting of opposite signs in opposite valleys, so the valleys are intrinsically spin-polarized when hole-doped. We study spin response in a simple model of these materials, with an eye to identifying sharp collective modes (i.e, spin-waves) that are more commonly characteristic of ferromagnets. We demonstrate that such modes exist for arbitrarily weak repulsive interactions, even when they are too weak to induce spontaneous ferromagnetism. The behavior of the spin response is explored for a range of hole dopings and interaction strengths.
description: 12 pages, 8 figures
The Molonglo Galactic Plane Survey: I. Overview and Images
Creators: name: Green, A. J.
name: Cram, L. E.
name: Large, M. I.
name: Ye, Taisheng
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The first epoch Molonglo Galactic Plane Survey (MGPS1) is a radio continuum survey made using the Molonglo Observatory Synthesis Telescope (MOST) at 843 MHz with a resolution of 43" X 43" cosec |delta|. The region surveyed is 245 deg < l < 355 deg, |b| < 1.5 deg. The thirteen 9 deg X 3 deg mosaic images presented here are the superposition of over 450 complete synthesis observations, each taking 12 h and covering 70' X 70' cosec |delta|. The root-mean-square sensitivity over much of the mosaiced survey is 1-2 mJy/beam (1 sigma), and the positional accuracy is approximately 1" X 1" cosec |delta| for sources brighter than 20 mJy. The dynamic range is no better than 250:1, and this also constrains the sensitivity in some parts of the images. The survey area of 330 sq deg contains well over 12,000 unresolved or barely resolved objects, almost all of which are extra-galactic sources lying in the Zone of Avoidance. In addition a significant fraction of this area is covered by extended, diffuse emission associated with thermal complexes, discrete H II regions, supernova remnants, and other structures in the Galactic interstellar medium.
description: Paper with 3 figures and 1 table + Table 2 + 7 jpg grayscales for Fig 4. Astrophysical Journal Supplement (in press) see also http://www.astrop.physics.usyd.edu.au/MGPS
Algebraic Connective $K$-Theory of a Severi-Brauer Variety with Prescribed Reduced Behavior
Creators: name: Mackall, Eoin
Publisher: name: Deutsche Mathematiker-Vereinigung
Year: 2021

description: We show that Chow groups of low dimension cycles are torsion free for a class of sufficiently generic Severi-Brauer varieties. Using a recent result of Karpenko, this allows us to compute the algebraic connective $K$-theory in low degrees for the same class of varieties. Independently of these results, we show that the associated graded ring for the topological filtration on the Grothendieck ring is torsion free in the same degrees for an arbitrary Severi-Brauer variety.
description: DOCUMENTA MATHEMATICA, Vol 26 (2021), p. 523-536
Local Escape Rates for $ϕ$-mixing Dynamical Systems
Creators: name: Haydn, Nicolai
name: Yang, Fan
Publisher: name: arXiv
Year: 2018
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37A25, 37A05

description: We show that dynamical systems with $ϕ$-mixing measures have local escape rates which are exponential with rate $1$ at non-periodic points and equal to the extremal index at periodic points. We apply this result to equilibrium states on subshifts of finite type, expanding interval maps, Gibbs states on conformal repellers and more generally to Young towers and by extension to all systems that can be modeled by a Young tower.
description: 33 pages
Analyzing Galaxy Catalogues with Minkowski Functionals
Creators: name: Kerscher, M.
name: Schmalzing, J.
name: Buchert, T.
Publisher: name: arXiv
Year: 1995
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the application of Minkowski functionals to galaxy catalogues with emphasis on the boundary corrections and point out the relevance for other statistical methods. The analysis of a cubic subsample of the CfA--1 data serves as an example.
description: 6 pages, uuencoded gzipped ps-file, 143 kByte Proc. ``Mapping, Measuring and Modelling the Universe'', Valencia 1995, eds.: P. Coles, V. Martinez, M. Pons, to be published by ASP