cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Modeling massive highly-multivariate nonstationary spatial data with the basis graphical lasso
Creators: name: Krock, Mitchell
name: Kleiber, William
name: Hammerling, Dorit
name: Becker, Stephen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We propose a new modeling framework for highly-multivariate spatial processes that synthesizes ideas from recent multiscale and spectral approaches with graphical models. The basis graphical lasso writes a univariate Gaussian process as a linear combination of basis functions weighted with entries of a Gaussian graphical vector whose graph is estimated from optimizing an $\ell_1$ penalized likelihood. This paper extends the setting to a multivariate Gaussian process where the basis functions are weighted with Gaussian graphical vectors. We motivate a model where the basis functions represent different levels of resolution and the graphical vectors for each level are assumed to be independent. Using an orthogonal basis grants linear complexity and memory usage in the number of spatial locations, the number of basis functions, and the number of realizations. An additional fusion penalty encourages a parsimonious conditional independence structure in the multilevel graphical model. We illustrate our method on a large climate ensemble from the National Center for Atmospheric Research's Community Atmosphere Model that involves 40 spatial processes.
Shape-Independent Expansion for the $^3S_1-^3D_1$ Mixing Parameter
Creators: name: Adhikari, Sadhan K.
name: Tomio, Lauro
name: DE Melo, J. P. B. C.
name: Frederico, T.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A low-energy shape-independent expansion is suggested for the function $[tan(2ε_{BB})/(2k^2)]$, where $ε_{BB}$ is the Blatt-Biedenharn mixing parameter for the $^3S_1 -$ $^3D_1$ channel. This expansion allows an evaluation of the mixing parameter $ε_{BB}$ from a knowledge of the deuteron asymptotic $D$ to $S$ ratio, pion mass and other low-energy observables, such as the scattering lengths, deuteron binding etc., of the nucleon-nucleon system. We demonstrate that the correct long range behavior of the tensor potential is essential for a realistic reproduction of $ε_{BB}$.
description: 7 pages, text and two postscript figures included
title: Ubykh2, listeXXXIII
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Phylogenetic relationships among American badgers (Taxidiinae) and the evolution of the badger ecomorph
Creators: name: Owen, Pamela Renee, 1964-
Publisher: name: The University of Texas at Austin
Year: 2000
Subjects: subject: American badger

description: The American badgers (Taxidiinae) are medium-sized mustelid carnivorans with a complex dentition and fossorial lifestyle. Despite a fair representation in late Cenozoic deposits of North America, the taxidiine badgers do not have an extensive fossil record. Additionally, the phylogenetic relationships among Taxidiinae and Melinae (Eurasian badgers) have been a source of controversy. The first chapter presents the description of a new genus and species of taxidiine badger, Chamitataxus avitus, from the late Miocene Chamita Formation in Rio Arriba County, New Mexico. The skull of this new taxon is described in detail, facilitated by high-resolution X-ray computed tomography (CT), which provides non-destructive visualization of the internal morphology. Notably, the P4 of Chamitataxus does not exhibit the development of a medial shelf and hypocone observed in Taxidea and Pliotaxidea. This is evidence for the acquisition of a P4 medial shelf and hypocone independent from that of meline badgers. The second chapter addresses the relationships among "badgers" by way of a phylogenetic analysis of the mustelid carnivorans. The preferred analysis was run using the complete data matrix of 82 morphological characters (craniodental, post-cranial, and soft tissue) and 37 mustelid genera (both fossil and Recent). A total of 24 equally most parsimonious trees were recovered, each with a length of 311 steps. The preferred tree does not support a monophyletic "badger" clade. Taxidiinae and Mellivora are sister taxa, while Melinae is the sister taxon of Lutrinae. The label "badger" is actually an ecomorphic term, for it has been applied to mustelids that are fossorial omnivores, sharing similar morphologies but not a recent common ancestor.
Numerical methods for the simulation of an aggregation-driven droplet size distribution
Creators: name: Bordás, Robert
name: John, Volker
name: Schmeyer, Ellen
name: Thévenin, Dominique
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: population balance systems
subject: TVD-ENO scheme
subject: group FEM-FCT method
subject: numerical computation of coalescence integrals
subject: 76F65
subject: 76T10

description: A droplet size distribution in a turbulent flow field is considered and modeled by means of a population balance system. This paper studies different numerical methods for the 4D population balance equation and their impact on an output of interest, the time-space-averaged droplet size distribution at the outlet which is known from experiments. These methods include different interpolations of the experimental data at the inlet, various discretizations in time and space, and different schemes for computing the aggregation integrals. It will be shown that notable changes in the output of interest might occur. In addition, the efficiency of the studied methods is discussed.
title: Ubykh2, listeXXXIV
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Constraints on Cosmological Parameters from MAXIMA-1
Creators: name: Balbi, A.
name: Ade, P.
name: Bock, J.
name: Borrill, J.
name: Boscaleri, A.
name: de Bernardis, P.
name: Ferreira, P. G.
name: Hanany, S.
name: Hristov, V. V.
name: Jaffe, A. H.
name: Lee, A. T.
name: Oh, S.
name: Pascale, E.
name: Rabii, B.
name: Richards, P. L.
name: Smoot, G. F.
name: Stompor, R.
name: Winant, C. D.
name: Wu, J. H. P.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We set new constraints on a seven-dimensional space of cosmological parameters within the class of inflationary adiabatic models. We use the angular power spectrum of the cosmic microwave background measured over a wide range of \ell in the first flight of the MAXIMA balloon-borne experiment (MAXIMA-1) and the low \ell results from COBE/DMR. We find constraints on the total energy density of the universe, Ω=1.0^{+0.15}_{-0.30}, the physical density of baryons, Ω_{b}h^2=0.03 +/- 0.01, the physical density of cold dark matter, Ω_{cdm}h^2=0.2^{+0.2}_{-0.1}$, and the spectral index of primordial scalar fluctuations, n_s=1.08+/-0.1, all at the 95% confidence level. By combining our results with measurements of high-redshift supernovae we constrain the value of the cosmological constant and the fractional amount of pressureless matter in the universe to 0.45
description: 4 pages, 4 figures. Reflects version published on ApJ Letters. Includes erratum (1 page, 2 figures) as published on ApJ Letters
Robust equilibration a posteriori error estimation for convection-diffusion-reaction problems
Creators: name: Eigel, Martin
name: Merdon, Christian
Publisher: name: Weierstrass Institute
Year: 2013
Subjects: subject: a posteriori
subject: error analysis
subject: finite element method
subject: equilibrated
subject: convection dominated
subject: adaptivity
subject: inhomogeneous Dirichlet
subject: augmented norm
subject: 65N30
subject: 65N15
subject: 65J15
subject: 65N22
subject: 65J10

description: We study a posteriori error estimates for convection-diffusion-reaction problems with possibly dominating convection or reaction and inhomogeneous boundary conditions. For the conforming FEM discretisation with streamline diffusion stabilisation (SDM), we derive robust and efficient error estimators based on the reconstruction of equilibrated fluxes in an admissible discrete subspace of H (div, Ω). Error estimators of this type have become popular recently since they provide guaranteed error bounds without further unknown constants. The estimators can be improved significantly by some postprocessing and divergence correction technique. For an extension of the energy norm by a dual norm of some part of the differential operator, complete independence from the coefficients of the problem is achieved. Numerical benchmarks illustrate the very good performance of the error estimators in the convection dominated and the singularly perturbed cases.
(U-Th)/He and U-Pb double dating constraints on the interplay between thrust deformation and basin evolution
Creators: name: Pujols, Edgardo Josue
name: 0000-0003-2810-279X
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Cordilleran orogenic system
Cordilleran foreland basin
Zircon geo-thermochronology
Sevier fold-thrust belt
Utah

description: Despite several decades of evolving concepts for thrust belt mechanics and foreland basin evolution, an in-depth understanding of key process linkages and dynamic connectivity between foreland basins and thrust belts remain elusive. In particular, temporal aspects of thrust deformation, detrital provenance, flexural basin subsidence, and stratigraphic architecture, remain debated. This study provides an unprecedented systematic U-Pb and (U-Th)/He (He) detrital zircon (DZ) double dating provenance record for the classic Sevier fold-thrust belt (SFTB) and foreland basin in north-central Utah, to elucidate the temporal linkage between thrust deformation, hinterland unroofing and foreland basin sedimentation through improved isotopic provenance analysis. The zircon (U-Th)/(He-Pb) data in the SFTB and foreland basin allowed constraining distinct episodes of cooling, indicative of major Cenomanian and Campanian thrusting and denudation in the SFTB. The temporal synchronicity between deformation, exhumation and coarse clastic strata indicates that rapid hinterland deformation triggers episodes of major coarse clastic sedimentation and dispersal beyond the proximal foreland basin margin. Moreover, DZHe depositional lag time and DZ U-Pb provenance analyses at the one-myr chronostratigraphic resolution strongly suggest that discrepancies in stacking pattern, shoreline trajectory and progradation rates in the foreland basin can in fact be explained by distinct episodes of major hinterland exhumation. This high-density DZ data set, additionally establish an unequivocal temporal link between major retroarc shortening and voluminous arc magmatism, challenging current conceptual Cordilleran orogenic models that invoke temporal delays between retroarc shortening and voluminous arc magma generation. Both arc magmatic fluxes and retroarc shortening episodes appear to be driven by plate boundary convergence rates. Hence, this study proposes a new model where rate increases in subduction and/or overriding plate motion control both retroarc contraction and arc-magma cyclicity. Other aspects of this investigation explore the influenced of tectonics on continental-scale drainage reorganization in western North America and the Neuquén Basin, Argentina. In summary, the integration of these zircon geo-thermochronometric data in the proper SFTB and foreland basin architectural context helped improve (1) conceptual models that relate temporal, thermal, and spatial aspects of thrust activity to sediment dispersal patterns and (2) shed light into the spatiotemporal feedbacks between upper-crustal deformation and convergent-margin magmatism in Cordilleran orogenic systems.
Supplementary document for Enhancing Light Extraction Efficiency of 242 nm DUV Micro-LEDs via Hybrid Nanorod Arrays - 7431210.pdf
Creators: name: Zhu, Licai
name: Lv, Shunpeng
name: Jiang, Ke
name: Ben, Jianwei
name: Zhang, Shanli
name: HAO, JIALONG
name: Peng, Jiale
name: zhang, ruojia
name: Li, Dabing
name: Xiaojuan, Sun
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: The supplementary material contains data that could not be included in the main text due to space constraints.
Stochastic Gradient Langevin Dynamics with Variance Reduction
Creators: name: Huang, Zhishen
name: Becker, Stephen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Stochastic gradient Langevin dynamics (SGLD) has gained the attention of optimization researchers due to its global optimization properties. This paper proves an improved convergence property to local minimizers of nonconvex objective functions using SGLD accelerated by variance reductions. Moreover, we prove an ergodicity property of the SGLD scheme, which gives insights on its potential to find global minimizers of nonconvex objectives.
title: Ubykh2, listeXXXV
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
title: Corporate disclosure and investor sentiment
title: The role of CSR communication, government policies, and audit data analytics
titleType: AlternativeTitle
Creators: name: Beer, Christian
Publisher: name: TU Dortmund
Year: 2023
Subjects: subject: Investor sentiment
subject: Corporate Social Responsibility
subject: Government policies
subject: Corporate disclosure
subject: 330
subject: Anlageverhalten
subject: Corporate Social Responsibility
subject: Publizität

description: Investor decision-making relies on accurate, timely information, but market efficiency theories and information asymmetry challenge the ability to outperform the market. Disclosure practices, including the emerging importance of ESG information, play a key role in shaping investor sentiment and market dynamics. Digital platforms, especially social media, have transformed how information is disseminated, influencing corporate disclosure practices and investor reactions. Behavioral finance highlights how psychological factors can lead to deviations from fundamental valuations. The COVID-19 pandemic underscored the impact of external shocks on investor sentiment, with government interventions playing a critical role in market responses. Auditing, adapting to include non-financial information like ESG, remains essential in reducing information asymmetry, with modern data-analytic tools like Process Mining offering potential to enhance audit efficiency. This dissertation explores the interplay between financial reporting, news dissemination, auditing practices, and their collective impact on the capital market, highlighting the importance of active corporate communication, government response to crises, and the evolving role of auditing in maintaining market trust.
title: Ubykh2, listeXXXVI
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
A review of variational multiscale methods for the simulation of turbulent incompressible flows
Creators: name: Ahmed, Naveed
name: Rebollo, Tomás Chacón
name: John, Volker
name: Rubino, Samuele
Publisher: name: Weierstrass Institute
Year: 2015
Subjects: subject: ncompressible Navier--Stockes equations
subject: turbulent flows
subject: variational multiscale methods (VMS)
subject: finite element methods
subject: numerical Analysis
subject: 65M60
subject: 76F65

description: Various realizations of variational multiscale (VMS) methods for simulating turbulent incompressible flows have been proposed in the past fifteen years. All of these realizations obey the basic principles of VMS methods: They are based on the variational formulation of the incompressible Navier--Stokes equations and the scale separation is defined by projections. However, apart from these common basic features, the various VMS methods look quite different. In this review, the derivation of the different VMS methods is presented in some detail and their relation among each other and also to other discretizations is discussed. Another emphasis consists in giving an overview about known results from the numerical analysis of the VMS methods. A few results are presented in detail to highlight the used mathematical tools. Furthermore, the literature presenting numerical studies with the VMS methods is surveyed and the obtained results are summarized.
Depositional architecture and geochemical evolution in Permian Capitan platforms of the Delaware Basin, Texas and New Mexico
Creators: name: Smith, Benjamin Paul
name: 0000-0003-3189-8717
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Permian
Carbonate
Sequence stratigraphy
Chemostratigraphy
Delaware Basin
Guadalupian

description: Geochemical data from carbonate sediments are used to constrain chemical changes in ancient oceans. Marine carbonates can be representative of the global ocean, but many ancient carbonates precipitated in isolated water masses such as restricted basins and interior seaways. As a result, geochemical and paleontological records from isolated basins may reflect both global environmental forcing and local water mass evolution. Understanding the interaction between global and local palaeoceanographic change is a key step in unravelling enigmatic marine biotic crises such as the Mid-Capitanian extinction. This study examines factors controlling salinity, stratification, and oxygenation in the Capitanian (Middle Permian) Delaware Basin, USA. Elemental and carbon isotope measurements from time-equivalent strata reveal differences between shallow- and deep- water masses, pointing to local controls such as stratification and de-oxygenated bottom water. Basinal dolomites and evaporites mark periods of elevated salinity commonly tied to sea-level lowstands, which correlate with turnover in fusulinid and brachiopod communities. Faunal turnover in the Delaware Basin demonstrates a fundamental attribute of restricted basin settings: water chemistry is often tightly coupled to physical process such as sea level change. We suggest that the relationships among sea level change, chemical changes, and biotic turnover may explain why the Capitanian mass extinction was more severe in isolated basins than the open ocean.
Narrow-Line Seyfert 1s: 15 Years Later
Creators: name: Pogge, Richard W.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The spectroscopic properties of the objects that came to be called Narrow-Line Seyfert 1s were first systematically described and named as such 15 years ago by Osterbrock & Pogge (1985). At the time, they were a relatively rare and peculiar subclass of Seyfert galaxies. Their discovery in large numbers in X-ray surveys, however, has elevated them to a role as important members of the AGN family, ones which may hold many keys to understanding the physics of AGN across the electromagnetic spectrum. This contribution reviews the spectral classification of the narrow-line Seyfert 1s, and describes some of the properties that make this unusual class of objects interesting.
description: Opening 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
title: Ubykh2, listeXXXVII
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
WPM package manager version 1.0 --- Software documentation
Creators: name: Streckenbach, Timo
Publisher: name: Weierstrass Institute
Year: 2010
Subjects: subject: Package manager
subject: software versioning
subject: dependencies
subject: source package
subject: virtual package
subject: compiler flags
subject: database
subject: root-permissions
subject: portability
subject: Mixing FORTRAN
subject: C and C++

description: WPM is a command-line tool designed to support build and installation facilities. It is implemented as a collection of script files, written in Bourne shell syntax. For the sake of portability the code takes care of the common pitfalls of shell programming.
Einstein gravity on the codimension 2 brane?
Creators: name: Bostock, Paul
name: Gregory, Ruth
name: Navarro, Ignacio
name: Santiago, Jose
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We look at general braneworlds in six-dimensional Einstein-Gauss-Bonnet gravity. We find the general matching conditions for the Einstein-Gauss-Bonnet braneworld, which remarkably turn out to give precisely the four-dimensional Einstein equations for the induced metric and matter on the brane, even when the extra dimensions are non-compact and have infinite volume. We also show that relaxing regularity of the curvature in the vicinity of the brane, or alternatively having a finite width brane, gives rise to an additional possible correction to the Einstein equations, which contains information on the brane's embedding in the bulk and cannot be determined from knowledge of the braneworld alone. We comment on the advantages and disadvantages of each possibility, and the relevance of these results regarding a possible solution of the cosmological constant problem.
description: 5 pages revtex; v2. reference added
Sensitivity of gravitational wave searches to the full signal of intermediate mass black hole binaries during the LIGO O1 Science Run
Creators: name: Bustillo, Juan Calderón
name: Salemi, Francesco
name: Canton, Tito dal
name: Jani, Karan
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The sensitivity of gravitational wave searches for binary black holes is estimated via the injection and posterior recovery of simulated gravitational wave signals in the detector data streams. When a search reports no detections, the estimated sensitivity is then used to place upper limits on the coalescence rate of the target source. In order to obtain correct sensitivity and rate estimates, the injected waveforms must be faithful representations of the real signals. Up to date, however, injected waveforms have neglected radiation modes of order higher than the quadrupole, potentially biasing sensitivity and coalescence rate estimates. In particular, higher-order modes are known to have a large impact in the gravitational waves emitted by intermediate mass black holes binaries. In this work we evaluate the impact of this approximation in the context of two search algorithms run by the LIGO Scientific Collaboration in their search for intermediate mass black hole binaries in the O1 LIGO Science Run data: a matched-filter based pipeline and a coherent un-modeled one. To this end we estimate the sensitivity of both searches to simulated signals including and omitting higher-order modes. We find that omission of higher-order modes leads to biases in the sensitivity estimates which depend on the masses of the binary, the search algorithm and the required level of significance for detection. In addition, we compare the sensitivity of the two search algorithms across the studied parameter space. We conclude that the most recent LIGO-Virgo upper limits on the rate of coalescence of intermediate mass black hole binaries are conservative for the case of highly asymmetric binaries. However, the tightest upper limits, placed for nearly-equal-mass sources, remain unchanged due to the small contribution of higher modes to the corresponding sources.
description: 13 pages, 8 figures
title: Ubykh2, listeXXXVIII
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
title: The shape of a defense-growth trade-off governs seasonal trait dynamics in natural phytoplankton
Creators: name: Ehrlich, Elias
name: Kath, Nadja Jeanette
name: Gaedke, Ursula
Publisher: name: Universität Potsdam
Year: 2024
Subjects: subject: 570 Biowissenschaften; Biologie

description: Theory predicts that trade-offs, quantifying costs of functional trait adjustments, crucially affect community trait adaptation to altered environmental conditions, but empirical verification is scarce. We evaluated trait dynamics (antipredator defense, maximum growth rate, and phosphate affinity) of a lake phytoplankton community in a seasonally changing environment, using literature trait data and 21 years of species-resolved high-frequency biomass measurements. The trait data indicated a concave defense-growth trade-off, promoting fast-growing species with intermediate defense. With seasonally increasing grazing pressure, the community shifted toward higher defense levels at the cost of lower growth rates along the trade-off curve, while phosphate affinity explained some deviations from it. We discuss how low fitness differences of species, inferred from model simulations, in concert with stabilizing mechanisms, e.g., arising from further trait dimensions, may lead to the observed phytoplankton diversity. In conclusion, quantifying trade-offs is key for predictions of community trait adaptation and biodiversity under environmental change.
description: Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1390
TetGen: A quality tetrahedral mesh generator and a 3D Delaunay triangulator (Version 1.5 --- User's Manual)
Creators: name: Si, Hang
Publisher: name: Weierstrass Institute
Year: 2013
Subjects: subject: tetrahedral mesh generation
subject: Delaunay tetrahedralization
subject: weighted Delaunay triangulation
subject: constrained Delaunay tetrahedralization
subject: mesh quality
subject: mesh refinement
subject: mesh adaption
subject: mesh coarsening
subject: 65M50
subject: 65N50

description: TetGen is a software for tetrahedral mesh generation. Its goal is to generate good quality tetrahedral meshes suitable for numerical methods and scientific computing. It can be used as either a standalone program or a library component integrated in other software. The purpose of this document is to give a brief explanation of the kind of tetrahedralizations and meshing problems handled by TetGen and to give a fairly detailed documentation about the usage of the program. Readers will learn how to create tetrahedral meshes using input files from the command line. Furthermore, the programming interface for calling TetGen from other programs is explained.
Broadband gate-tunable THz plasmons in graphene heterostructures
Creators: name: Yao, Baicheng
name: Liu, Yuan
name: Huang, Shu-Wei
name: Choi, Chanyeol
name: Xie, Zhenda
name: Flores, Jaime Flor
name: Wu, Yu
name: Yu, Mingbin
name: Kwong, Dim-Lee
name: Huang, Yu
name: Rao, Yunjiang
name: Duan, Xiangfeng
name: Wong, Chee Wei
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Graphene, a unique two-dimensional material of carbon in a honeycomb lattice, has brought remarkable breakthroughs across the domains of electronics, mechanics, and thermal transport, driven by the quasiparticle Dirac fermions obeying a linear dispersion. Here we demonstrate a counter-pumped all-optical difference frequency process to coherently generate and control THz plasmons in atomic layer graphene with an octave tunability and high efficiency. We leverage the inherent surface asymmetry of graphene for a strong second-order nonlinear polarizability chi(2), which together with tight plasmon field confinement, enables a robust difference frequency signal at THz frequencies. The counter-pumped resonant process on graphene uniquely achieves both energy and momentum conservation. Consequently we demonstrate a dual-layer graphene heterostructure that achieves the charge- and gate-tunability of the THz plasmons over an octave, from 9.4 THz to 4.7 THz, bounded only by the pump amplifier optical bandwidth. Theoretical modeling supports our single-volt-level gate tuning and optical-bandwidth-bounded 4.7 THz phase-matching measurements, through the random phase approximation with phonon coupling, saturable absorption, and below the Landau damping, to predict and understand the graphene carrier plasmon physics.
title: Ubykh2, listeXXXIX
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Long-Range Correlations in Closed Shell Nuclei
Creators: name: Müther, H.
name: Skouras, L. D.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The effects of correlations on the bulk properties of nuclei are investigated in large model spaces including up to 21 single-particle orbits. The evaluation of the single-particle Green function is made feasible by means of the BAGEL approximation. The spectral function for single-nucleon pick-up and removal is investigated for the nuclei $^{16}O$ and $^{40}Ca$ . Special attention is paid to the effects produced by correlations on the calculated ground state properties of closed shell nuclei. It is observed that correlations beyond the Brueckner Hartree Fock approximation tend to improve the results obtained using realistic nucleon nucleon interactions.
description: 23 pages 4 figures not included, Report Tu-93-0810
Opinion leaders on Twitter immigration issue networks : combining agenda-setting effects and the two-step flow of information
Creators: name: Yoo, Joseph Jai-Sung
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Opinion leadership
Social network
Agenda-setting
Immigration
Networked public sphere
Time-series analysis

description: This dissertation focuses on opinion leaders on the Twitter issue networks to examine the two-step flow of information and agenda-setting effects. It analyzes the US immigration issue network as a case study because it is controversial on Twitter, and many elites such as lawyers and politicians who can influence others’ opinions are engaged in Twitter debates. Twitter is an important platform for active public debates, serving as a networked public sphere that can be used as a source and disseminator of information. Research has shown that communication patterns on the networked public spheres vary, including top-down, bottom-up, and side-by-side communications. This dissertation asked the following questions: (1) what is the shape of the Twitter immigration issue network? (2) who are Twitter opinion leaders, and what are their characteristics? and (3) who sets the agenda on Twitter: news media, opinion leaders, or the public? To answer those questions, this dissertation employs (1) social network analysis to identify immigration issue networks and opinion leaders, (2) hierarchical linear regressions to examine factors that can predict opinion leadership, and (3) Granger causality tests to measure the longitudinal agenda-setting effects of each group (news media, opinion leaders, and the public). The author differentiated between the retweet and mention networks because while the retweet network is intended to disseminate information, the mention network is intended to elicit responses, motivating users to participate in Twitter conversations. Through social network analysis, the author found divisions among clusters. Especially, the retweet network was classified as a polarized network and the mention network was described as a community cluster. The results of hierarchical linear regression analyses indicated that elite status, verified status, the number of followers, and individual issue involvement were common predictors of opinion leadership. The results of time-series Granger causality tests showed a mixture of top-down and bottom-up agenda-setting effects. This dissertation extends our theoretical understanding of opinion leaders based on traditional theories including two-step flow of information and agenda-setting effects. A key practical implication is that active Twitter users can be opinion leaders and can contribute to setting an issue agenda.
title: The effect of compression and expansion on stochastic reaction networks
Creators: name: Waizmann, Tabea
Publisher: name: IMT Alti Studi Lucca
Year: 2021

description: Markov chains are a fundamental model to study systems with stochastic behavior. However, their state space is often of an unmanageable size, making the use of approximations and simplifications necessary for analytic solutions. This thesis considers reaction networks as a well-known representation for Markov chains describing interactions between species populations. It presents several methods using model transformations to aid with the effective analysis of such systems. Species equivalence is a reduction technique that lifts the concept (and related algorithms) of Markov chain lumpability from lumping of states to directly lumping species in a reaction network. This allows the simplification of a reaction network without first examining its state space. The tool DiffLQN implements a method for the analysis of large-scale stochastic models for the performance evaluation of software systems using an approach based on deterministic rate equations, by means of a compact system of ordinary differential equations that approximate only mean estimates for stochastic reaction networks. Deterministic rate equations are generally accurate for networks with large populations, but may incur errors when elements are only present in low copy numbers. This thesis presents finite state expansion, which aims to solve that problem. It does so by converting a given reaction network into an expanded one with additional species and reactions such that the overall stochastic behavior is preserved. The resulting rate equations, however, may enjoy increased accuracy. Several tests on example models show that finite state expansion proves competitive with other state-of-the-art methods.
Parareal Neural Networks Emulating a Parallel-in-time Algorithm
Creators: name: Lee, Chang-Ock
name: Lee, Youngkyu
name: Park, Jongho
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: As deep neural networks (DNNs) become deeper, the training time increases. In this perspective, multi-GPU parallel computing has become a key tool in accelerating the training of DNNs. In this paper, we introduce a novel methodology to construct a parallel neural network that can utilize multiple GPUs simultaneously from a given DNN. We observe that layers of DNN can be interpreted as the time step of a time-dependent problem and can be parallelized by emulating a parallel-in-time algorithm called parareal. The parareal algorithm consists of fine structures which can be implemented in parallel and a coarse structure which gives suitable approximations to the fine structures. By emulating it, the layers of DNN are torn to form a parallel structure which is connected using a suitable coarse network. We report accelerated and accuracy-preserved results of the proposed methodology applied to VGG-16 and ResNet-1001 on several datasets.
Coded Aperture Ptychography: Uniqueness and Reconstruction
Creators: name: Chen, Pengwen
name: Fannjiang, Albert
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Uniqueness of solution is proved for any ptychographic scheme with a random masks under a minimum overlap condition and local geometric convergence analysis is given for the alternating projection (AP) and Douglas-Rachford (DR) algorithms. DR is shown to possess a unique fixed point in the object domain and for AP a simple criterion for distinguishing the true solution among possibly many fixed points is given. A minimalist scheme is proposed where the adjacent masks overlap 50\% of area and each pixel of the object is illuminated by exactly four times during the whole measurement process. Such a scheme is conveniently parametrized by the number $q$ of shifted masks in each direction. The lower bound $1-C/q^2$ is proved for the geometric convergence rate of the minimalist scheme, predicting a poor performance with large $q$ which is confirmed by numerical experiments. Extensive numerical experiments are performed to explore what the general features of a well-performing mask are like, what the best-performing values of $q$ for a given mask are, how robust the minimalist scheme is with respect to measurement noise and what the significant factors affecting the noise stability are.
title: Ubykh2, liste40
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Estudo​ experimental​ ​com​ ​as​ ferramentas​ ​Oracle​ ​​Data​ ​Mining, IBM​ ​SPSS​ ​e​ ​SAS​ ​​Enterprise​ ​Miner
Creators: name: Breno​ ​G.​ ​De​ ​Luna
name: Matheus Barboza
name: Paulemir​ ​G.​ ​Campos
Publisher: name: figshare
Year: 2019
Subjects: Applied Computer Science

description: ​Neste artigo é apresentado um estudo experimental com as ferramentas de Mineração de Dados (MD) Oracle Data Mining, IBM SPSS e SAS Enterprise Miner. Almejando descobrir em que problemas poderão ser utilizadas, inclusive, verificar se tratam Big Data, essas ferramentas foram aplicadas a três bases de dados. Adicionalmente, pretende-se também com essa pesquisa ajudar a tomada de decisão por gestores organizacionais, auxiliando-os a escolher ferramentas de MD
mais​ ​apropriadas​ ​ao​ ​seu​ ​cotidiano​ ​de​ ​trabalho.
Foliated affine and projective structures
Creators: name: Deroin, Bertrand
name: Guillot, Adolfo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 37F75, 53C12, 57M50

description: We formalize the concepts of holomorphic affine and projective structures along the leaves of holomorphic foliations by curves on complex manifolds. We show that many foliations admit such structures, we provide local normal forms for them at singular points of the foliation, and we prove some index formulae in the case where the ambient manifold is compact. As a consequence of these, we establish that a regular foliation of general type on a compact algebraic manifold of even dimension does not admit a foliated projective structure. Finally, we classify foliated affine and projective structures along regular foliations on compact complex surfaces.
Functional traits influence patterns in vegetative and reproductive plant phenology – a multi‐botanical garden study
Creators: name: Sporbert, Maria
name: Jakubka, Desiree
name: Bucher, Solveig Franziska
name: Hensen, Isabell
name: Freiberg, Martin
name: Heubach, Katja
name: König, Andreas
name: Nordt, Birgit
name: Plos, Carolin
name: Blinova, Ilona
name: Bonn, Aletta
name: Knickmann, Barbara
name: Koubek, Tomáš
name: Linstädter, Anja
name: Mašková, Tereza
name: Primack, Richard B.
name: Rosche, Christoph
name: Shah, Manzoor A.
name: Stevens, Albert‐Dieter
name: Tielbörger, Katja
name: Träger, Sabrina
name: Wirth, Christian
name: Römermann, Christine
Publisher: name: Universität Regensburg
Year: 2022
Subjects: subject: FLOWERING PHENOLOGY; CLIMATE-CHANGE; NORTHERN-HEMISPHERE; LEAF; TIME; PHYLOGENY; RESPONSES; DRIVERS; HEIGHT; AUTUMN; botanical gardens; first flowering day; growing season length; leaf traits; PhenObs phenological network; phylogeny
subject: 550 Geowissenschaften

description: Phenology has emerged as key indicator of the biological impacts of climate change, yet the role of functional traits constraining variation in herbaceous species' phenology has received little attention. Botanical gardens are ideal places in which to investigate large numbers of species growing under common climate conditions. We ask whether interspecific variation in plant phenology is influenced by differences in functional traits. We recorded onset, end, duration and intensity of initial growth, leafing out, leaf senescence, flowering and fruiting for 212 species across five botanical gardens in Germany. We measured functional traits, including plant height, absolute and specific leaf area, leaf dry matter content, leaf carbon and nitrogen content and seed mass and accounted for species' relatedness. Closely related species showed greater similarities in timing of phenological events than expected by chance, but species' traits had a high degree of explanatory power, pointing to paramount importance of species' life-history strategies. Taller plants showed later timing of initial growth, and flowered, fruited and underwent leaf senescence later. Large-leaved species had shorter flowering and fruiting durations. Taller, large-leaved species differ in their phenology and are more competitive than smaller, small-leaved species. We assume climate warming will change plant communities' competitive hierarchies with consequences for biodiversity.
title: Ubykh2, liste41
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
A new approach to topological T-duality for principal torus bundles
Creators: name: Dove, Tom
name: Schick, Thomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geometric Topology (math.GT)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We introduce a new `Thom class' formulation of topological T-duality for principal torus bundles. This definition is equivalent to the established one of Bunke, Rumpf, and Schick but has the virtue of removing the global assumptions on the H-flux required in the old definition. With the new definition, we provide easier and more transparent proofs of the classification of T-duals and generalise the local formulation of T-duality for circle bundles by Bunke, Schick, and Spitzweck to the torus case.
description: 29 pages. v2: final version with spelling corrections and added reference, accepted in Reviews in Mathematical Physics
Improving energy literacy with online/video resources: The Switch curriculum example
Creators: name: Corboy, James J.
name: 0000-0003-2455-9581
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Energy, Education

description: In response to years of American students demonstrating poor understanding of energy and energy-related issues, a number of groups have sought to improve student energy literacy by developing curriculum that engages and motivates students to learn more about this important subject. Although the energy documentary film Switch was not produced with a classroom experience in mind, the success of the film in connecting with environmentalists, industry, and academia supported using the documentary to test the power of film as an effective teaching tool for improving energy literacy. To test the effectiveness of Switch, we created an assessment tool to first determine students’ baseline energy literacy, and then determine whether the documentary effected a change. This assessment indicated that many incoming college students identify their Advanced Placement Environmental Science class as the place they learned about energy. The assessment results indicate that students’ attitude, behavior, and knowledge about energy and energy-related issues changed in a statistically significant way over the course of a 2-3 day learning experience. The effect size increase of 0.47 on energy knowledge supports using the documentary Switch, and similar non-partisan films designed for objective education, as inexpensive, scalable teaching tools to introduce energy in the classroom.
Storage dynamics of the upper Nueces River alluvial aquifer: Implications for recharge to the Edwards Aquifer, Texas
Creators: name: Hackett, Caroline Croft
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Alluvial aquifer
Edwards Aquifer
Nueces River

description: The karstic Edwards Aquifer is a crucial water resource in south-central Texas, serving as the primary water source for over two million people in the greater San Antonio area. The Nueces River basin is the largest contributor of recharge to the Edwards Aquifer, and recharge has traditionally been measured as the difference between river discharge at the upstream and downstream ends of the Edwards Group outcrop (Edwards Aquifer Recharge Zone, EARZ). This study investigated the extent to which groundwater in alluvial terraces and younger, near-channel alluvium deposits impact the timing and magnitude of recharge from the Nueces basin. Estimates of alluvial storage derived from geologic maps and sparse groundwater data suggest that over 21,000 acre-feet (25.9 x 106 m3) of groundwater are stored in the upper Nueces River alluvial aquifer, with an estimated maximum capacity of over 75,000 acre-ft (92.5 x 106 m3). However, the dynamics of alluvial bank storage and drainage from the alluvial aquifer and their impacts on downstream recharge are unknown. In this study, river water storage and transport in alluvium were investigated using differential gaging, dye tracer testing, baseflow recession analyses, and floodplain groundwater mass balances. Field investigations were made at a gaged, alluvium-lined reach of the Nueces River where the river partially supplies a major tributary that maintained baseflow during the 2011 drought (whereas river flow ceased). Significant streamflow losses in the study area are largely the result of storage in high conductivity gravels adjacent to the channel, with some recharge to the alluvial aquifer and discrete recharge into bedrock. The baseflow contribution from the upper Nueces River alluvial aquifer contributes up to 100% of river flow during low flow conditions in the basin. The magnitude and shape of baseflow recession is dynamic between the growing and dormant seasons. These findings have implications for groundwater pumping from the upper Nueces River basin alluvial aquifer and the management of recharge to the Edwards Aquifer.