cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cops and robbers on planar directed graphs
Creators: name: Po-Shen  Loh
name: Siyoung  Oh
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Aigner and Fromme initiated the systematic study of the cop number of a graph by proving the elegant and sharp result that in every connected planar graph, three cops are sufficient to win a natural pursuit game against a single robber. This game, introduced by Nowakowski and Winkler, is commonly known as Cops and Robbers in the combinatorial literature. We extend this study to directed planar graphs, and establish separation from the undirected setting. We exhibit a geometric construction which shows that a more sophisticated robber strategy can indefinitely evade three cops on a particular strongly connected planar directed graph
Additional file 10 of The chromatin reader Dido3 is a regulator of the gene network that controls B cell differentiation
Creators: name: del Burgo, Fernando Gutiérrez
name: García-López, María Ángeles
name: Pons, Tirso
name: de Luis, Enrique Vázquez
name: Martínez-A, Carlos
name: Villares, Ricardo
Publisher: name: figshare
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file10 (PDF 78 KB)
Triadic closure in configuration models with unbounded degree fluctuations
Creators: name: van der Hofstad, Remco
name: van Leeuwaarden, Johan S. H.
name: Stegehuis, Clara
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: The configuration model generates random graphs with any given degree distribution, and thus serves as a null model for scale-free networks with power-law degrees and unbounded degree fluctuations. For this setting, we study the local clustering $c(k)$, i.e., the probability that two neighbors of a degree-$k$ node are neighbors themselves. We show that $ c(k)$ progressively falls off with $k$ and eventually for $k=Ω(\sqrt{n})$ settles on a power law $c(k)\sim k^{-2(3-τ)}$ with $τ\in(2,3)$ the power-law exponent of the degree distribution. This fall-off has been observed in the majority of real-world networks and signals the presence of modular or hierarchical structure. Our results agree with recent results for the hidden-variable model and also give the expected number of triangles in the configuration model when counting triangles only once despite the presence of multi-edges. We show that only triangles consisting of triplets with uniquely specified degrees contribute to the triangle counting.
Three-body resonances by complex scaling
Creators: name: Csoto, Attila
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: It is demonstrated that the complex scaling method can be used in practical calculations to localize three-body resonances. Our model example emphasizes the fact that in three-body systems several essentially different asymptotic behaviors can appear. We show that the possibility of these different asymptotic configurations can lead to an apparent, resonance like structure in the three-body continuum.
description: REVTEX, Submitted to Phys. Rev. C, 8 pages, 2 postscript figures are available upon request. ATOMKI-93/6
Spatial arrangement of deformation bands and processes of formation within porous sandstone : Arches National Park, Utah
Creators: name: Gibbons, Timothy David
Publisher: name: The University of Texas at Austin
Year: 2006
Subjects: Spatial arrangement
Deformation bands
Sandstones
Moab Member
Arches National Park
Jurassic
Entrada Sandstone

description: Individual deformation bands within porous sandstones reduce permeability and form barriers to fluid flow. A network of deformation bands can destroy reservoir connectivity and impose compartmentalization. Consequently, the spatial arrangement of deformation bands affects fluid flow within sandstone reservoirs, but it is unknown whether deformation bands occur at random locations or whether they follow systematic patterns. This study, undertaken at Arches National Park, examined the spatial arrangement of deformation bands in the Moab Member of the Jurassic Entrada Sandstone. Field observations of this unit accurately quantified spatial relationships between deformation bands across 6 orders of magnitude (1 cm to 10 km). A 9.4-km-long scanline was constructed within the Moab Member, to measure spacing and orientation for individual deformation bands (N = 1467). Correlation count methodology was used to determine the spatial arrangement of deformation bands. Correlation count analyses show that deformation bands within the Moab Member are natural fractals (self organized) at short length scales (cm to m). Although the spatial arrangement of deformation bands also is non-random at long length scales (m to km), spatial arrangement is not fractal (externally organized). Down-plunge projection shows that at long length scales, regions of abundant deformation bands correspond with hinge zones of subtle tectonic folds. The fractal nature of deformation bands, evident at short-length scales, may be attributed to overall strain hardening during deformation band development. Deformation bands interact with one another due to strain hardening, and this results in spontaneous self organization. At long-length scales, deformation band occurrence is controlled by lateral variation in strain magnitude due to other deformation processes. Deformation bands are non-random in space, but the spatial organization is externally imposed
Sound-propagation gap in fluid mixtures
Creators: name: Sinha, Supurna
name: Marchetti, M. Cristina
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We discuss the behavior of the extended sound modes of a dense binary hard-sphere mixture. In a dense simple hard-sphere fluid the Enskog theory predicts a gap in the sound propagation at large wave vectors. In a binary mixture the gap is only present for low concentrations of one of the two species. At intermediate concentrations sound modes are always propagating. This behavior is not affected by the mass difference of the two species, but it only depends on the packing fractions. The gap is absent when the packing fractions are comparable and the mixture structurally resembles a metallic glass.
description: Published; withdrawn since ordering in archive gives misleading impression of new publication
Fluvial-deltaic and shallow-marine seismic geomorphology of the West Natuna Basin : implications for reservoir architecture and basin evolution
Creators: name: Flint, Jed McKay
Publisher: name: The University of Texas at Austin
Year: 2006
Subjects: Fluvial-deltaic
Shallow-marine
Seismic geomorphology
Morphometric analysis
3D
Reservoirs
Basins
West Natuna Basin
Indonesia

description: Quantitative seismic geomorphology and morphometric analysis of modern and paleo-landforms are powerful tools for extracting data about geologic history, processes, and fill architecture of terrestrial and marine basins. This study of the hydrocarbon-rich West Natuna Basin of Indonesia combines 3,154 km² of high-quality 3D seismic and analysis of 15 well logs to explain how 3D reservoir shape, size, and distribution evolve and are preserved within fluvial-deltaic and shallow-marine environments. The study also addresses how these characteristics vary in response to changes in tectonic regime and base level. We made statistically robust, morphometric measurements of channel form and character using PC software, and where well logs have penetrated channels, we determined lithology and calculated sand percentages. The area has a variety of channel morphologies, ranging in sinuosity from 1 to 4.67 and varying in width from 30m to 4458m. Geometries range from single thread to wide, multithread. Crevasse splays and interdistributary creeks and lakes lie adjacent to channels. Sand percentages vary greatly between element types, and many multikilometer-scale elements show complex accretionary architectural composition. The result of combining morphometric measurements with lithologic characterization is a predictive model that strengthens the relationship between channel form and sediment content. Architectural and sedimentologic changes have been assessed in the context of the basin's tectonic, climatic, and sea-level history. Results of this study apply not only to development of the study area, but to explaining how reservoir shape, size, and distribution evolve and are preserved within fluvial-deltaic and shallow-marine environments
COME: Cylindrical oriented muon emission in GEANT4 simulations
Creators: name: Topuz, Ahmet Ilker
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: In this study, a source scheme based on source biasing as well as discrete energy spectrum in the cylindrical geometry is presented for the simulations of muon tomography in the GEANT4 toolkit. First, a lateral cylindrical surface and a top circular disc act as a generation surface that surrounds the tomographic setup. Then, the generated muons are directed towards the origin where the target volume is situated. Secondly, the kinetic energy of the entering muons is assigned by using a 80-bin discrete energy spectrum between 0 and 8 GeV that is extracted from the CRY muon generator. Thus, the present recipe is called cylindrical oriented muon emission (COME). This source scheme may especially find its applications in the cases where the lateral muon detectors are utilized in order to profit from the horizontal or horizontal-like muons.
description: 6 pages, 2 figures. London Journal of Physics, 2024
Anti-de-Sitter vacua require fermionic brane charges
Creators: name: Peeters, Kasper
name: Zamaklar, Marija
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that a modification of the super-AdS algebras which accounts for the presence of D-branes requires not only the inclusion of bosonic brane charges, but also the inclusion of new fermionic ones. We show that such fermionic brane charges are indeed present in the matrix model and the supermembrane in the pp-wave limit of the corresponding backgrounds. We briefly comment on an AdS version of Sezgin's M-algebra inspired by this observation.
description: 10 pages
title: ADCO, Grènetier de Cîteaux : comptes (1499-1503) (11 H 1173), f. 00185
Creators: name: de la Côte-d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CBMA/CG21/F.PETOT/2019
name: Petot, Frédéric
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Corpus Burgundiae Medii Aevi
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Chartes de la Bourgogne du Moyen Âge
subject: comptes

description: Grènetier de Cîteaux : comptes (1499-1503), Archives départementales de la Côte-d'Or, (11 H 1173). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Grènetier de Cîteaux : comptes (1499-1503), Archives départementales de la Côte-d'Or, (11 H 1173), f. 00185, 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
Cops and Robbers on Geometric Graphs
Creators: name: Beveridge, Andrew
name: Dudek, Andrzej
name: Frieze, Alan
name: Muller, Tobias
Publisher: name: Carnegie Mellon University
Year: 2011
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Cops and robbers is a turn-based pursuit game played on a graph G. One robber is pursued by a set of cops. In each round, these agents move between vertices along the edges of the graph. The cop number c(G) denotes the minimum number of cops required to catch the robber in finite time. We study the cop number of geometric graphs. For points x 1, . . ., xn ∈ ℝ2, and r ∈ ℝ+, the vertex set of the geometric graph G(x 1, . . ., xn; r) is the graph on these npoints, with xi, xj adjacent when ∥xi − xj ∥ ≤ r. We prove that c(G) ≤ 9 for any connected geometric graph G in ℝ2 and we give an example of a connected geometric graph with c(G) = 3. We improve on our upper bound for random geometric graphs that are sufficiently dense. Let (n,r) denote the probability space of geometric graphs with nvertices chosen uniformly and independently from [0,1]2. For G ∈ (n,r), we show that with high probability (w.h.p.), ifr ≥ K 1 (log n/n)1/4 then c(G) ≤ 2, and if r ≥ K 2(log n/n)1/5 then c(G) = 1, where K 1, K 2 > 0 are absolute constants. Finally, we provide a lower bound near the connectivity regime of (n,r): if r ≤ K 3 log n/ then c(G) > 1 w.h.p., where K 3 > 0 is an absolute constant.
Resurgence : a rebirth of blackness in Austin
Creators: name: Henderson, Kara Elyse
name: 0000-0002-4069-0718
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: East Austin
East Side
Resurgence
Rebirth
Austin
Black Austin
Creators
Austin creators
Austin creatives
Multi-media Kara Henderson
Kara Elyse

description: This work spotlights the narrative of a group unofficially termed the “creators”. Consisting primarily of millennial, black transplants who, upon arriving to Austin— the city lauded as the progressive “blue island in the red sea”— found black culture and spaces to be lacking, they— as a result— began working to create their own. I propose that these creators— artists, musicians, activists, poets, community leaders, corporate professionals and performers— have generated a new wave of black culture. Though there are many who fit this description, I’ve chosen a select few to focus on, at least for this initial project which contains three components: a video, photo series, and an essay, all hosted on a website. (Link: https://karahenderson03.wixsite.com/resurgence) The video serves to introduce the general plot of the story, as well as some of the major players. It will be pitched as the start of a full-length documentary to various digital platforms. Photographs fall under the category of either ‘portrait’ or ‘sense of place’. The written portion offers a deeper look at the prevailing issues plaguing the city’s black populous. The contention between the remaining “ethnic enclave” of Austin’s historically, black East Side and younger generations is a subtle theme throughout the video. Though both groups’ missions are ultimately the same— to preserve and champion blackness and black culture in Austin— there have seldom been collaborations. Generational divides, and a shift in regard for traditional black home spaces (church, school systems) that historically served as gathering places within the community, are at least partially to blame. Exacerbating these issues is the city’s continual promotion and claims of non-existent diversity. Austin brings major black, urban artists to partake in festivals such as ACL or SXSW without seeming to offer fundamental support to its own minority, artist community. This project attempts to highlight stories not often heard or given the platform they deserve, and more generally, display black folks simply being or existing in Austin.
A Structure for Quasars
Creators: name: Elvis, Martin
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We propose a simple unifying structure for the inner regions of quasars and AGN. This empirically derived model links together the BALs, the narrow UV/X-ray ionized absorbers, the BELR, and the Compton scattering/fluorescing regions into a single structure. The model also suggests an origin for the large-scale bi-conical outflows. Some other potential implications of this structure are discussed.
description: Contributed talk presented at the Joint MPE,AIP,ESO workshop on NLS1s, Bad Honnef, Dec. 1999, to appear in New Astronomy Reviews; also available at http://wave.xray.mpe.mpg.de/conferences/nls1-workshop
The lost boy
Creators: name: Ridge, Eleanor
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: Vatlongos
subject: tvk

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Violation of a Leggett-Garg inequality using ideal negative measurements in neutron interferometry
Creators: name: Kreuzgruber, Elisabeth
name: Wagner, Richard
name: Geerits, Niels
name: Lemmel, Hartmut
name: Sponar, Stephan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on an experiment that demonstrates the violation of a Leggett-Garg inequality (LGI) with neutrons. LGIs have been proposed in order to assess how far the predictions of quantum mechanics defy macroscopic realism. With LGIs, correlations of measurements performed on a single system at different times are described. The measured value of K = 1.120 +/- 0.007, obtained in a neutron interferometric experiment, is clearly above the limit K = 1 predicted by macro-realistic theories.
description: 6 pages, 8 figures
Dilepton production from virtual bremsstrahlung induced by proton capture
Creators: name: Van Neck, D.
name: Dieperink, A. E. L.
name: Scholten, O.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Dilepton production following radiative capture of a proton on a nuclear target is studied in the Impulse Approximation. The cross section is decomposed in terms of four time-like nuclear structure functions through a longitudinal-transverse separation of the nuclear current. Using a simple PWIA model, cross sections and conversion factors are calculated for capture reactions p + n >> d + e^+ e^-, p + p >> 2He + e^+ e^- and p + 11B >> 12C + e^+ e^- at proton energies of 100-200 MeV. The result is compared with a recent measurement of the conversion factor for p + 11B.
description: 19 pages (RevteX), 9 figures available on request, KVI-1034
Galaxy Zoo: Secular evolution of barred galaxies from structural decomposition of multi-band images
Creators: name: Kruk, Sandor J.
name: Lintott, Chris J.
name: Bamford, Steven P.
name: Masters, Karen L.
name: Simmons, Brooke D.
name: Häußler, Boris
name: Cardamone, Carolin N.
name: Hart, Ross E.
name: Kelvin, Lee
name: Schawinski, Kevin
name: Smethurst, Rebecca J.
name: Vika, Marina
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of two-component (disc+bar) and three-component (disc+bar+bulge) multiwavelength 2D photometric decompositions of barred galaxies in five SDSS bands ($ugriz$). This sample of $\sim$3,500 nearby ($z<0.06$) galaxies with strong bars selected from the Galaxy Zoo citizen science project is the largest sample of barred galaxies to be studied using photometric decompositions which include a bar component. With detailed structural analysis we obtain physical quantities such as the bar- and bulge-to-total luminosity ratios, effective radii, Sérsic indices and colours of the individual components. We observe a clear difference in the colours of the components, the discs being bluer than the bars and bulges. An overwhelming fraction of bulge components have Sérsic indices consistent with being pseudobulges. By comparing the barred galaxies with a mass-matched and volume-limited sample of unbarred galaxies, we examine the connection between the presence of a large-scale galactic bar and the properties of discs and bulges. We find that the discs of unbarred galaxies are significantly bluer compared to the discs of barred galaxies, while there is no significant difference in the colours of the bulges. We find possible evidence of secular evolution via bars that leads to the build-up of pseudobulges and to the quenching of star formation in the discs. We identify a subsample of unbarred galaxies with an inner lens/oval and find that their properties are similar to barred galaxies, consistent with an evolutionary scenario in which bars dissolve into lenses. This scenario deserves further investigation through both theoretical and observational work.
description: 26 pages, 21 figures; accepted for publication in MNRAS
Ferromagnetism and metal-like transport in antiferromagnetic insulator heterostructures
Creators: name: Padhan, P.
name: Murugavel, P.
name: Prellier, W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Strained Pr$_{0.5}$Ca$_{0.5}$MnO$_3$/La$_{0.5}$Ca$_{0.5}$MnO$_3$/Pr$_{0.5}$Ca$_{0.5}$MnO $_3$ trilayers were grown on (001)-SrTiO$_3$ substrates using the pulsed-laser deposition technique. The coupling at the interfaces of several trilayers has been investigated from magnetization and electronic transport experiments. An increase of La$_{0.5}$Ca$_{0.5}$MnO$_3$ layer thickness induces a magnetic ordering in the strain layers and at the interfaces leading to ferromagnetic behavior and enhanced coercivity, while resistivity shows metal-like behaviors. These effects are not observed in the parent compounds, which are antiferromagnetic insulators, opening a path, to induce artificially some novel properties.
description: To be published in Applied Physics Letters
Additional file 11 of The chromatin reader Dido3 is a regulator of the gene network that controls B cell differentiation
Creators: name: del Burgo, Fernando Gutiérrez
name: García-López, María Ángeles
name: Pons, Tirso
name: de Luis, Enrique Vázquez
name: Martínez-A, Carlos
name: Villares, Ricardo
Publisher: name: figshare
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file11 (PDF 83 KB)
Tropical convexity in location problems
Creators: name: Comăneci, Andrei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: Metric Geometry (math.MG)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: 14T90, 26B25, 52A30, 90B85, 92B10

description: We investigate location problems whose optimum lies in the tropical convex hull of the input points. Firstly, we study geodesically star-convex sets under the asymmetric tropical distance and introduce the class of tropically quasiconvex functions whose sub-level sets have this shape. The latter are related to monotonic functions. Then we show that location problems whose distances are measured by tropically quasiconvex functions as before give an optimum in the tropical convex hull of the input points. We also show that a similar result holds if we replace the input points by tropically convex sets. Finally, we focus on applications to phylogenetics presenting properties of consensus methods arising from our class of location problems.
description: 19 pages, 3 figures
Volcano Tour
Creators: name: Ridge, Eleanor
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: Vatlongos
subject: tvk

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Physical modeling of evaporite-detached salients
Creators: name: Fox, Christine René Zúñiga
Publisher: name: The University of Texas at Austin
Year: 2006
Subjects: Physical modeling
Evaporites
Salients
Fold-and-thrust belts

description: The use of scaled physical modeling of thin-skinned fold-and-thrust belts allows isolation of key parameters in the development of convex-toward-the-foreland folds and thrusts. Unlike salients formed in natural settings, scaled physical models can be monitored through time, with structures dissected and analyzed at the completion of the experiment. Conducting strain and displacement vector field analysis of individual model stages yields quantitative insight into the kinematics of salient development. I constructed twenty-one scaled physical models in order to study the processes leading to the formation of salients and extrapolate the models to natural examples. Thus, variation of model rheologies and boundary conditions test the influence of stratigraphic parameters on the formation of salients in thin-skinned fold-and-thrust deformation belts. The physical models created for this study reveal that the pre-collisional evaporitic décollement pinch-outs toward the foreland, lateral, and hinterland exert great influence on the degree of fold and thrust curvature across the salient, the presence of vertical axis rotation during salient formation, and the geometry of the structural trend line patterns of folds and thrusts within the salient. Brittle/viscous models showed two distinct patterns of fold curvature, local curvature near the décollement pinch-out and distributed curvature above the evaporitic décollement, dependent on the lateral and hinterland boundaries of the décollement. Fold axial traces initiated with localized curvature above the lateral pinch-out, while structures maintained linear axial traces above the central décollement layer in models with lateral boundaries perpendicular to convergence direction of a linear indenter. However, I found that vertical axis rotation of the folds and thrusts did occur. Conversely, fold axial traces initiated with distributed along strike curvature in models with a pre-collisional hinterland protruding décollement. Fold axial traces in viscous/viscous models initiated with localized or distributed along strike curvature that became more convex with progressive deformation. Vertical axis rotation also occurred in these models
Tachyons, Scalar Fields and Cosmology
Creators: name: Gorini, V.
name: Kamenshchik, A. Yu.
name: Moschella, U.
name: Pasquier, V.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the role that tachyon fields may play in cosmology as compared to the well-established use of minimally coupled scalar fields. We first elaborate on a kind of correspondence existing between tachyons and minimally coupled scalar fields; corresponding theories give rise to the same cosmological evolution for a particular choice of the initial conditions but not for any other. This leads us to study a specific one-parameter family of tachyonic models based on a perfect fluid mixed with a positive cosmological constant. For positive values of the parameter one needs to modify Sen's action and use the sigma process of resolution of singularities. The physics described by this model is dramatically different and much richer than that of the corresponding scalar field. For particular choices of the initial conditions the universe, that does mimick for a long time a de Sitter-like expansion, ends up in a finite time in a special type of singularity that we call a "big brake". This singularity is characterized by an infinite deceleration.
description: 7 figures. Enlarged discussion of the big brake cosmology. Continuation of the model clarified. References added
title: 03_0663
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Drug Expiry Debate: An Approach to Myth and Reality
Creators: name: Gikonyo, Dan
name: Gikonyo, Anthony
name: Luvayo, Duncan
name: Premanand Ponoth
Publisher: name: Zenodo
Year: 2021
Subjects: Medication
drugs
drug expiry
drug efficacy

description: Hospital, nursing homes, and retail pharmacies and consumers toss away and more so hospitals alone discard over $800 million in drugs annually. If we can modify to work around it, so that it will be beneficial to the African and Asian continent, especially more so in the peripheral outreach health centres in Africa where availability and storage of medicines are a challenge. The cost implications of these studies are staggering and has shown that each dollar spent to demonstrate longer than labelled drug stability could translate to $94 saved on repurchasing these products.
Saturated Ferromagnetism from Statistical Transmutation in Two Dimensions
Creators: name: Saiga, Yasuhiro
name: Oshikawa, Masaki
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The total spin of the ground state is calculated in the U -> infinity Hubbard model with uniform magnetic flux perpendicular to a square lattice, in the absence of Zeeman coupling. It is found that the saturated ferromagnetism emerges in a rather wide region in the space of the flux density ϕand the electron density n_e. In particular, the saturated ferromagnetism at ϕ= n_e is induced by the formation of a spin-1/2 boson, which is a composite of an electron and the unit flux quantum.
description: 4 pages, 3 figures; final version
DTC: Deep Tracking Control
Creators: name: Jenelten, Fabian
name: He, Junzhe
name: Farshidian, Farbod
name: Hutter, Marco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Legged locomotion is a complex control problem that requires both accuracy and robustness to cope with real-world challenges. Legged systems have traditionally been controlled using trajectory optimization with inverse dynamics. Such hierarchical model-based methods are appealing due to intuitive cost function tuning, accurate planning, generalization, and most importantly, the insightful understanding gained from more than one decade of extensive research. However, model mismatch and violation of assumptions are common sources of faulty operation. Simulation-based reinforcement learning, on the other hand, results in locomotion policies with unprecedented robustness and recovery skills. Yet, all learning algorithms struggle with sparse rewards emerging from environments where valid footholds are rare, such as gaps or stepping stones. In this work, we propose a hybrid control architecture that combines the advantages of both worlds to simultaneously achieve greater robustness, foot-placement accuracy, and terrain generalization. Our approach utilizes a model-based planner to roll out a reference motion during training. A deep neural network policy is trained in simulation, aiming to track the optimized footholds. We evaluate the accuracy of our locomotion pipeline on sparse terrains, where pure data-driven methods are prone to fail. Furthermore, we demonstrate superior robustness in the presence of slippery or deformable ground when compared to model-based counterparts. Finally, we show that our proposed tracking controller generalizes across different trajectory optimization methods not seen during training. In conclusion, our work unites the predictive capabilities and optimality guarantees of online planning with the inherent robustness attributed to offline learning.
Dubious Identities: A Visit to the Borwein Zoo
Creators: name: Bradshaw, Zachary P.
name: Vignat, Christophe
Publisher: name: arXiv
Year: 2023
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 00A08 05A19 41A99

description: We contribute to the zoo of dubious identities established by J.M. and P.B. Borwein in their 1992 paper, "Strange Series and High Precision Fraud" with five new entries, each of a different variety than the last. Some of these identities are again a high precision fraud and picking out the true from the bogus can be a challenging task with many unexpected twists along the way.
description: 17 pages, to appear in American Mathematical Monthly
Hockey is For Everyone holds the key to hockey's racism problem
Creators: name: Price, Nicholas George
name: 0000-0002-1132-7805
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Hockey
Racism
Diversity
Hockey is For Everyone

description: Hockey has faced racism and incidents of racism since it's very beginning. There are multiple obstacles standing in the way of the diversification, and thus, growth, of hockey and a larger group of fans, including the cost of the sport, far greater than most others, and the culture of the sport.  Duante' Abercrombie's experiences show how racism occurs in hockey as well as potential solutions. From growing up with hockey in Washington D.C. in the early 2000's, to playing professionally, to coaching, Abercrombie can offer a guide.  Hockey is For Everyone, a program developed by the NHL in the 1990's, also offers a solution. By delivering the sport into inner cities, funding participation and by also delivering after-school activities and educational opportunities, HiFE can help grow the sport in ways many other programs cannot.  Finally, USA Hockey has also learned from Hockey is For Everyone and is stepping up efforts to diversify hockey.  This work offers a look into how to solve hockey's problem with racism, as well as with dealing with other groups, especially women, often excluded from the sport.
Enrichment in r-process elements from multiple distinct events in the early Draco dwarf spheroidal galaxy
Creators: name: Tsujimoto, Takuji
name: Matsuno, Tadafumi
name: Aoki, Wako
name: Ishigaki, Miho N.
name: Shigeyama, Toshikazu
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The stellar record of elemental abundances in satellite galaxies is important to identify the origin of r-process because such a small stellar system could have hosted a single r-process event, which would distinguish member stars that are formed before and after the event through the evidence of a considerable difference in the abundances of r-process elements, as found in the ultra-faint dwarf galaxy Reticulum II (Ret II). However, the limited mass of these systems prevents us from collecting information from a sufficient number of stars in individual satellites. Hence, it remains unclear whether the discovery of a remarkable r-process enrichment event in Ret II explains the nature of r-process abundances or is an exception. We perform high-resolution spectroscopic measurements of r-process abundances for twelve metal-poor stars in the Draco dwarf galaxy in the metallicity range of -2.5
description: 6 pages including 3 figures, accepted for publication in ApJL
Convergence of the two-phase Stefan problem to the one-phase problem
Creators: name: Stoth, Barbara
Publisher: name: Carnegie Mellon University
Year: 1994
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "We study the limit of the one-dimensional Stefan problem as the diffusivity coefficient of the solid phase approaches zero. We derive a weak formulation of the equilibrium condition for the resulting one-phase problem that allows jumps of the temperature accross [sic] the interface. The weak formulation consists of a regularity condition that only enforces the usual equilibrium condition to hold from the liquid phase. At the end we briefly discuss the radial problem in higher space dimensions. The main tool in order to prove the convergence are uniform bounds on the total variation of the free boundary that are derived using a regularized problem, where the equilibrium condition is substituted by a dynamical condition."
Additional file 12 of The chromatin reader Dido3 is a regulator of the gene network that controls B cell differentiation
Creators: name: del Burgo, Fernando Gutiérrez
name: García-López, María Ángeles
name: Pons, Tirso
name: de Luis, Enrique Vázquez
name: Martínez-A, Carlos
name: Villares, Ricardo
Publisher: name: figshare
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file12 (PDF 78 KB)
Mid-infrared Plasmonic Circular Dichroism Generated by Graphene Nanodisk Assemblies
Creators: name: Kong, Xiang-Tian
name: Zhao, Runbo
name: Wang, Zhiming
name: Govorov, Alexander O.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: It is very interesting to bring plasmonic circular dichroism spectroscopy to the mid-infrared spectral interval, and there are two reasons for this. This spectral interval is very important for thermal bio-imaging and, simultaneously, this spectral range includes vibrational lines of many chiral biomolecules. Here we demonstrate that graphene plasmons indeed offer such opportunity. In particular, we show that chiral graphene assemblies consisting of a few graphene nanodisks can generate strong circular dichroism (CD) in the mid-infrared interval. The CD signal is generated due to the plasmon-plasmon coupling between adjacent nanodisks in the specially designed chiral graphene assemblies. Because of the large dimension mismatch between the thickness of a graphene layer and the incoming light's wavelength, three-dimensional configurations with a total height of a few hundred nanometers are necessary to obtain a strong CD signal in the mid-infrared range. The mid-infrared CD strength is mainly governed by the total dimensions (total height and helix scaffold radius) of the graphene nanodisk assembly, and by the plasmon-plasmon interaction strength between its constitutive nanodisks. Both positive and negative CD bands can be observed in the graphene assembly array. The frequency interval of the plasmonic CD spectra overlaps with the vibrational modes of some important biomolecules, such as DNA and many different peptides, giving rise to the possibility of enhancing the vibrational optical activity of these molecular species by attaching them to the graphene assemblies. Simultaneously the spectral range of chiral mid-infrared plasmons in our structures appears near the typical wavelength of the human-body thermal radiation and, therefore, our chiral metastructures can be potentially utilized as optical components in thermal imaging devices.
description: 24 pages, 6 figures
The structural and thermal evolution of upper oceanic crust in the western South Atlantic : insights from seismic velocities and hydrothermal models
Creators: name: Kardell, Dominik A.
name: 0000-0002-6722-1022
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Oceanic crust
Hydrothermal circulation
Heat flow
Oceanic plateau
South Atlantic
Seismic velocities
Streamer tomography
Full-waveform inversion
Marine Geology and Geophysics

description: The evolution of oceanic crust plays an integral role in global heat flow, geochemical cycles, and in shaping the environmental conditions harboring the crustal biosphere. Because oceanic crust is normally buried beneath several kilometers of water and encompasses a vast area of the Earth’s rigid surface, spatially extensive and coherent geophysical data are difficult to acquire in the oceanic domain. Consequently, our current understanding of the evolution of oceanic crust is based on partially conflicting compilations of data that are acquired at different scales and using different methods. Here I present geophysical constraints from an extensive seismic dataset that continuously covers 0-70 Ma crust in the western South Atlantic. Analysis of regional seismic velocity trends in the upper crust shows a continuous increase in basement velocity to crustal ages of at least 58 Ma. This trend indicates an evolution of upper crustal velocities that lasts significantly longer than measured or predicted by previous studies. The results provide evidence for ongoing hydrothermal circulation in relatively old upper crust, which is consistent with heat flow studies. To further test this concept, I used high-resolution seismic velocity models to estimate detailed porosity and permeability distributions that constrain models of hydrothermal fluid flow at five different crustal ages. The resulting advective and conductive surface heat fluxes are consistent with both predictions of heat flux by lithospheric cooling models and measured conductive heat flux at the seafloor. Additionally, computed hydrothermal volume fluxes largely agree with global estimates for the modeled crustal ages. The models are therefore consistent with a “sealing age” of ~65 Ma, which is also inferred from a compilation of global heat flow measurements at the seafloor. Close to the Rio Grande Rise, an oceanic plateau west of the study area, a fine-scale seismic velocity model reveals multiple large fault zones penetrating at least ~1.5 km into the crust. These faults likely accommodate differential subsidence between thickened, warm oceanic plateau crust and cold oceanic crust. Modeled fluid fluxes are elevated along the interpreted fault zones and across the seafloor. Crust adjacent to oceanic plateaus may exhibit elevated levels of tectonic activity and fluid flow globally. The estimated global volume of fluid entering the ocean in this type of setting amounts to 43 km³, which is ~2% of the hydrothermal flux in the axial region. This potentially has implications for global chemical cycles, the hydration of mature oceanic crust, and the oceanic crustal biosphere.
The Geometry of D=11 Null Killing Spinors
Creators: name: Gauntlett, Jerome P.
name: Gutowski, Jan B.
name: Pakis, Stathis
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We determine the necessary and sufficient conditions on the metric and the four-form for the most general bosonic supersymmetric configurations of D=11 supergravity which admit a null Killing spinor i.e. a Killing spinor which can be used to construct a null Killing vector. This class covers all supersymmetric time-dependent configurations and completes the classification of the most general supersymmetric configurations initiated in hep-th/0212008.
description: 30 pages, typos corrected, reference added, new solution included in section 5.1; uses JHEP3.cls
Chaotic Dynamics in the Framework of the Vlasov-Nordheim Equation
Creators: name: Baldo, M.
name: Burgio, G. F.
name: Rapisarda, A.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In the framework of the time-dependent mean field theory, we solve the Vlasov-Nordheim equation and study the sensitive dependence of this highly non-linear equation on the initial conditions. We find that, when nuclear matter is inside the spinodal region, initially small differences between similar trajectories grow exponentially and produce strongly divergent paths resulting in a chaotic evolution. We focus on the fact that chaos spontaneously arises without putting any additional noise. We calculate the largest Lyapunov exponent for various initial densities. This analysis is performed for nuclear matter in two dimensions. It is argued that the mean field chaoticity can cause nuclear multifragmentation observed in intermediate energy heavy-ion reactions.
description: 7 pages, 7 postscript figures available upon request to A. Rapisarda. Latex version 3.1. Catania University preprint no.93/37
The elliptic-regularization principle in Lagrangian mechanics
Creators: name: Liero, Matthias
name: Stefanelli, Ulisse
Publisher: name: Weierstrass Institute
Year: 2011
Subjects: subject: Lagrangian mechanics
subject: variational principle
subject: elliptic regularization
subject: time discretization
subject: 70H03
subject: 70H30
subject: 65L10

description: We present a novel variational approach to Lagrangian mechanics based on elliptic regularization with respect to time. A class of parameter-dependent global-in-time minimization problems is presented and the convergence of the respective minimizers to the solution of the system of Lagrange's equations is ascertained. Moreover, we extend this perspective to mixed dissipative/nondissipative situations, present a finite time-horizon version of this approach, and provide related Γ-convergence results. Finally, some discussion on corresponding time-discrete versions of the principle is presented.