cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A gradient formula for linear chance constraints under Gaussian distribution
Creators: name: Henrion, René
name: Möller, Andris
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: Chance constraints
subject: probabilistic constraints
subject: derivative of singular normal distribution
subject: derivative of Gaussian probability for polyhedra
subject: 90C15

description: We provide an explicit gradient formula for linear chance constraints under a (possibly singular) multivariate Gaussian distribution. This formula allows one to reduce the calculus of gradients to the calculus of values of the same type of chance constraints (in smaller dimension and with different distribution parameters). This is an important aspect for the numerical solution of stochastic optimization problems because existing efficient codes for e.g., calculating singular Gaussian distributions or regular Gaussian probabilities of polyhedra can be employed to calculate gradients at the same time. Moreover, the precision of gradients can be controlled by that of function values which is a great advantage over using finite difference approximations. Finally, higher order derivatives are easily derived explicitly. The use of the obtained formula is illustrated for an example of a transportation network with stochastic demands.
Hamiltonian Treatment of the Gravitational Collapse of Thin Shells
Creators: name: Crisostomo, Juan
name: Olea, Rodrigo
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A Hamiltonian treatment of the gravitational collapse of thin shells is presented. The direct integration of the canonical constraints reproduces the standard shell dynamics for a number of known cases. The formalism is applied in detail to three dimensional spacetime and the properties of the (2+1)-dimensional charged black hole collapse are further elucidated. The procedure is also extended to deal with rotating solutions in three dimensions. The general form of the equations providing the shell dynamics implies the stability of black holes, as they cannot be converted into naked singularities by any shell collapse process.
description: 20 pages,1 figure, CECS style. Accepted for publication in Physical Review D
title: On the Road
title: La route
titleType: AlternativeTitle
Creators: name: Mazaudon, Martine
name: Michailovsky, Boyd
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Limbu
subject: lif

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Geometric singularities for solutions of single conservation laws
Creators: name: Shyuichi  Izumiya
name: Kossioris, Georgios T.
Publisher: name: Carnegie Mellon University
Year: 1993
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "In this paper we describe the geometric framework for the study of generation and propagation of shock waves in R[superscript n] appearing in weak solutions of scalar conservation laws. We first define the notion of geometric solutions for scalar conservation laws in the framework of one-parameter unfoldings of immersions. The geometric solutions are, in general, multi-valued and they are constructed by the method of characteristics. We use singularity theory techniques to classify the generic types of multi-valuedness of the geometric solutions. Such a classification is used to construct the unique entropy solution of the scalar conservation law by selecting the proper single-valued discontinuous branch of the geometric solution satisfying the entropy condition across the discontinuity."
Professional and ethnic identity in the formation of the National Association of Hispanic Journalists
Creators: name: Sinta Morales, Vinicio Antonio
Publisher: name: The University of Texas at Austin
Year: 2018
Subjects: Oral history
Latinos
Journalism associations

description: This dissertation presents the context and antecedents of the formation of the National Association of Hispanic Journalists (NAHJ). The organization, formally established in 1984, was the first pan-ethnic entity with a national reach created to support and represent Latino media professionals across the United States. This research takes a close look at the way in which a critical mass of Latino journalists—many of them the only, or first in their outlet—built on the momentum of civil rights activism to create an entity charged with the mission of promoting the professional development of Latino media professionals. Building on oral history interviews with early NAHJ leaders and archival sources, this research highlights the direct and indirect connections the organization had with Chicano and other Latino civil rights activism and with academia, as well as the essential support provided by the then-thriving philanthropic arm of media corporations, like the Gannett Foundation. Through the oral testimonials of key players in the creation of NAHJ, this dissertation also provides insights into the role of ethnic and professional identity in media activism by active media workers.
Homogenization of elastic waves in fluid-saturated porous media using the Biot model
Creators: name: Mielke, Alexander
name: Rohan, Eduard
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: Two-scale homogenization
subject: porous media
subject: acoustic waves
subject: elastodynamics
subject: Darcy's law
subject: seepage
subject: 35B27
subject: 74F10
subject: 76M50
subject: 76S05

description: We consider periodically heterogeneous fluid-saturated poroelastic media described by the Biot model with inertia effects. The weak and semistrong formulations for displacement, seepage and pressure fields involve three equations expressing the momentum and mass balance and the Darcy law. Using the two-scale homogenization method we obtain the limit two-scale problem and prove the existence and uniqueness of its weak solutions. The Laplace transformation in time is used to decouple the macroscopic and microscopic scales. It is shown that the seepage velocity is eliminated form the macroscopic equations involving strain and pressure fields only. The plane harmonic wave propagation is studied using an example of layered medium. Illustrations show some influence of the orthotropy on the dispersion phenomena.
Peratochetvs philippii Rondani 1863
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Clusiidae
Peratochetvs
Peratochetvs philippii

description: Peratochetvs philippii Rondani, 1863
ORIGINAL DESCRIPTION: 1863: 43.
 TYPE LOCALITY: “ Chiliae [Chile]”.
 TYPE MATERIAL: 1 ♀, syntype (covered with mold) (MZUN: Box Coll. entomol. extra-europea, Gen. Grallomya a Celiphus): Peratochetus philippii Rnd., Valdivia / M. Zool. N° 11477.
 CURRENT STATUS: valid species, as Alloclusia philippii (Soós 1968: 2); valid species, as Apiochaeta philippii (Lonsdale & Marshall 2008: 20).
 REMARKS: Rondani (1863: 43) described Peratochetvs philippii, without specifying the number, the sex or the length of the specimens, from material received from R.A. Philippi. Costa (1866: 34) listed a single MZUN specimen numbered “745” from Valdivia [Valdivia (southern Chile)]. Lonsdale & Marshall (2008: 21) incorrectly designated the neotype believing that Rondani’s Neotropical specimens, originally deposited in the MZUN, had been destroyed. We consider the single MZUN female as a syntype and therefore invalidate Lonsdale & Marshall’s neotype (I.C.Z.N. 1999: Article 75.8). Rondani described this nominal species under the generic name “ Peratochetvs ”, which is an “incorrect subsequent spelling of Peratochetus Rondani, 1856 ” (O’Hara et al. 2011: 139).
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 91, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Scattering theory from artificial piezoelectric-like meta-atoms and molecules
Creators: name: Goltcman, Leonid
name: Hadad, Yakir
Publisher: name: arXiv
Year: 2017
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Inspired by the natural piezoelectric effect, we introduce hybrid-wave electromechanical meta-atoms and meta-molecules that consist of coupled electrical and mechanical oscillators with similar resonance frequencies. We propose an analytical model for the linearized electromechanical scattering process, and explore its properties based on first principles. We demonstrate that by exploiting the linearized hybrid-wave interaction, one may enable functionalities that are forbidden otherwise, going beyond the limits of today's metamaterials. As an example we show an electrically deep sub-wavelength dimer of meta-atoms with extremely sensitive response to the direction-of-arrival of an impinging electromagnetic wave. This scheme of meta-atoms and molecules may open ways for metamaterials with a plethora of exciting dynamics and phenomena that have not been studied before with potential technological implications in radio-frequencies and acoustics.
description: 6 pages, 3 figures
title: ADCO, Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome VI, Cart. 190 (11 H 75), 316 folios, f. 0267v
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire

description: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome VI, Archives départementales de la Côte-d'Or, Cart. 190 (11 H 75), 316 folios, f. 0267v, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome VI, Archives départementales de la Côte-d'Or, Cart. 190 (11 H 75), 316 folios, f. 0267v, 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
Depositional systems, lithofacies, and geochemistry of the Jurassic (Oxfordian) Smackover and Buckner Formations in Van Zandt County, Texas : a type-core section
Creators: name: Schemper, Peter John
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Smackover
East Texas

description: The Late Jurassic Smackover Formation is part of a prolific petroleum system along the northern rim of the Gulf of Mexico with a long history of exploration. Most investigations into the Smackover have taken place in sub basins east of the East Texas basin and primarily focus on upper Smackover oolitic grainstone reservoirs, but only a few studies have been completed on the lower Smackover source rocks. Because of this, there is a lack of understanding related to the conditions under which the lower Smackover was deposited. This study provides a more complete understanding of the Smackover deposits in the East Texas through investigation of a long continuous 713-ft core drilled from the Sun Oil Travis GU No. 1 well in Van Zandt County, Texas. It contains a continuous section of Smackover lithofacies from lower Smackover mudstones to upper Smackover grainstones and contains a large portion of the overlying Buckner Anhydrite. The goal of this investigation is to lithologically and chemically characterize the Smackover Formation in order to create a type section for future studies and create a refined depositional model for East Texas Smackover deposition. High-resolution geochemical data composed of x-ray diffraction analysis (XRD), total organic carbon (TOC) and Rock-Eval, x-ray fluorescence (XRF) analysis, and isotope data was taken to fully characterize the section chemically. This geochemical dataset provides insight into controls on organic matter accumulation and destruction, diagenetic fluids, and local and global isotope signatures. With understandings of lithofacies distribution, depositional controls for organic accumulation and porosity development, and diagenesis the unconventional and conventional potential of the Smackover can be assessed.
An Introduction to Data Analysis in Asteroseismology
Creators: name: Campante, Tiago L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: A practical guide is presented to some of the main data analysis concepts and techniques employed contemporarily in the asteroseismic study of stars exhibiting solar-like oscillations. The subjects of digital signal processing and spectral analysis are introduced first. These concern the acquisition of continuous physical signals to be subsequently digitally analyzed. A number of specific concepts and techniques relevant to asteroseismology are then presented as we follow the typical workflow of the data analysis process, namely, the extraction of global asteroseismic parameters and individual mode parameters (also known as peak-bagging) from the oscillation spectrum.
description: Lecture presented at the IVth Azores International Advanced School in Space Sciences on "Asteroseismology and Exoplanets: Listening to the Stars and Searching for New Worlds" (arXiv:1709.00645), which took place in Horta, Azores Islands, Portugal in July 2016
title: Existence, uniqueness, and numerical approximations for stochastic burgers equations
Creators: name: Mazzonetto, Sara
name: Salimova, Diyora
Publisher: name: Universität Potsdam
Year: 2024
Subjects: subject: 510 Mathematik

description: In this article, we propose an all-in-one statement which includes existence, uniqueness, regularity, and numerical approximations of mild solutions for a class of stochastic partial differential equations (SPDEs) with non-globally monotone nonlinearities. The proof of this result exploits the properties of an existing fully explicit space-time discrete approximation scheme, in particular the fact that it satisfies suitable a priori estimates. We also obtain almost sure and strong convergence of the approximation scheme to the mild solutions of the considered SPDEs. We conclude by applying the main result of the article to the stochastic Burgers equations with additive space-time white noise.
description: Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1393
Mathematical modeling of Czochralski type growth processes for semiconductor bulk single crystals
Creators: name: Dreyer, Wolfgang
name: Druet, Pierre-Étienne
name: Klein, Olaf
name: Sprekels, Jürgen
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: Czochralski method
subject: crystal growth
subject: traveling magnetic fields
subject: radiative heat transfer
subject: nonlinear PDE systems
subject: Navier--Stokes equations
subject: MHD equations
subject: Maxwell's equations
subject: well-posedness
subject: optimal control
subject: first-order necessary optimality conditions
subject: numerical simulation
subject: 35Q30
subject: 35Q61
subject: 45G05
subject: 76W05
subject: 80A20
subject: 80A22

description: This paper deals with the mathematical modeling and simulation of crystal growth processes by the so-called Czochralski method and related methods, which are important industrial processes to grow large bulk single crystals of semiconductor materials such as, e.,g., gallium arsenide (GaAs) or silicon (Si) from the melt. In particular, we investigate a recently developed technology in which traveling magnetic fields are applied in order to control the behavior of the turbulent melt flow. Since numerous different physical effects like electromagnetic fields, turbulent melt flows, high temperatures, heat transfer via radiation, etc., play an important role in the process, the corresponding mathematical model leads to an extremely difficult system of initial-boundary value problems for nonlinearly coupled partial differential equations. In this paper, we describe a mathematical model that is under use for the simulation of real-life growth scenarios, and we give an overview of mathematical results and numerical simulations that have been obtained for it in recent years.
title: Manioc
title: Manioc
titleType: AlternativeTitle
Creators: name: Mazaudon, Martine
name: Michailovsky, Boyd
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Limbu
subject: lif

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Source-to-sink analysis of the lower Miocene strata in the Gulf of Mexico Basin
Creators: name: Xu, Jie, Ph.D.
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Lower Miocene
Source to Sink
Gulf of Mexico
Detrital zircon
U-Pb
U-Pb-He double dating
Channel-belt
Scaling relationship

description: The sedimentary archive of the Gulf of Mexico Basin provides an opportunity to study sediment routing from continental highlands to basin sinks for a large passive margin system. This dissertation focuses on the source-to-sink analysis of the lower Miocene system, a major siliciclastic unit. Much remains unknown about sediment routing within this system. In this work, detrital zircon U-Pb and (U-Th)/He double dating and channel-belt scaling relationship are used for source-to-sink analysis. Zircon U-Pb age data from 19 samples across the northern Gulf of Mexico margin indicate that continental-scale sediment sources shift across the northern Gulf of Mexico from highlands in western North America to the Appalachian Mountains and foreland basin in eastern North America during the early Miocene. Sediment associated with the paleo–Rio Bravo, Rio Grande, Brazos, Red, Mississippi, Tombigbee, and Apalachicola rivers can be differentiated, improving definition of sediment transport pathways from upland sources to basin sinks. Combined U-Pb and (U-Th)/He double dating on single zircon grains documents both crystallization and exhumation histories of source terranes and have the ability to differentiate first-cycle volcanic and plutonic zircons from multi-cycle zircons. Many Mesozoic zircons yield roughly identical U-Pb and (U-Th)/He ages, indicating that large volumes of sediments were eroded from various Cretaceous-Oligocene volcanic fields in western North America. A large proportion of older Proterozoic zircons, including those from Grenville, Mid-Continent and Yavapai-Mazatzal provinces, yield several phases of exhumation, providing clues for tracing intermediate sediment sources. This work shows that recycled sedimentary strata are important sediment contributors to the Gulf of Mexico Basin. We also estimate the drainage areas of lower Miocene systems by using scaling relationships, developed in source-to-sink studies, between drainage area and fluvial channel depth. Single-storey channel-belt thicknesses were measured from a well log database in this well-explored basin and used to estimate paleo-drainage areas of five differentiated early Miocene fluvial systems. The predicted drainage areas show good agreement with the paleo-drainage areas reconstructed independently from detrital zircon provenance analyses and continental geomorphic synthesis. Therefore, knowledge of fluvial deposit dimensions provides a first-order estimate of drainage basin area and a plausible assessment of a continental geomorphology.
The Proca Field in Curved Spacetimes and its Zero Mass Limit
Creators: name: Schambach, Maximilian
name: Sanders, Ko
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate the classical and quantum Proca field (a massive vector potential) of mass $m>0$ in arbitrary globally hyperbolic spacetimes and in the presence of external sources. We motivate a notion of continuity in the mass for families of observables $\left\{O_m\right\}_{m>0}$ and we investigate the massless limit $m\to0$. Our limiting procedure is local and covariant and it does not require a choice of reference state. We find that the limit exists only on a subset of observables, which automatically implements a gauge equivalence on the massless vector potential. For topologically non-trivial spacetimes, one may consider several inequivalent choices of gauge equivalence and our procedure selects the one which is expected from considerations involving the Aharonov-Bohm effect and Gauss' law. We note that the limiting theory does not automatically reproduce Maxwell's equation, but it can be imposed consistently when the external current is conserved. To recover the correct Maxwell dynamics from the limiting procedure would require an additional control on limits of states. We illustrate this only in the classical case, where the dynamics is recovered when the Lorenz constraint remains well behaved in the limit.
description: 35 pages
On evolutionary Gamma convergence for gradient systems
Creators: name: Mielke, Alexander
Publisher: name: Weierstrass Institute
Year: 2014
Subjects: subject: Variational evolution
subject: energy functional
subject: dissipation potential
subject: dissipation distance
subject: gradient flows
subject: Gamma convergence
subject: Mosco convergence
subject: well-prepared initial conditions
subject: rate-independent systems
subject: abstract chain-rule
subject: energy-dissipation balance
subject: integrated evolutionary variational estimate
subject: energetic solutions
subject: 35B27
subject: 35K55
subject: 47H20
subject: 49S05
subject: 49J40
subject: 49J45

description: In these notes we discuss general approaches for rigorously deriving limits of generalized gradient flows. Our point of view is that a generalized gradient system is defined in terms of two functionals, namely the energy functional Eε and the dissipation potential Rε or the associated dissipation distance. We assume that the functionals depend on a small parameter and the associated gradients systems have solutions uε. We investigate the question under which conditions the limits u of (subsequences of) the solutions uε are solutions of the gradient system generated by the Γ-limits E0 and R0. Here the choice of the right topology will be crucial as well as additional structural conditions.
 We cover classical gradient systems, where Rε is quadratic, and rate-independent systems as well as the passage from viscous to rate-independent systems. Various examples, such as periodic homogenization, are used to illustrate the abstract concepts and results.
On the super-orbital modulation of supergiant high mass X-ray binaries
Creators: name: Bozzo, E.
name: Oskinova, L.
name: Lobel, A.
name: Hamann, W. -R.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The long-term X-ray lightcurves of classical supergiant X-ray binaries and supergiant fast X-ray transients show relatively similar super-orbital modulations, which are still lacking a sound interpretation. We propose that these modulations are related to the presence of corotating interaction regions (CIRs) known to thread the winds of OB supergiants. To test this hypothesis, we couple the outcomes of 3-D hydrodynamic models for the formation of CIRs in stellar winds with a simplified recipe for the accretion onto a neutron star. The results show that the synthetic X-ray light curves are indeed modulated by the presence of the CIRs. The exact period and amplitude of these modulations depend on a number of parameters governing the hydrodynamic wind models and on the binary orbital configuration. To compare our model predictions with the observations, we apply the 3-D wind structure previously shown to well explain the appearance of discrete absorption components in the UV time series of a prototypical B0.5I-type supergiant. Using the orbital parameters of IGRJ16493-4348 which has the same B0.5I donor spectral type, the period and modulations in the simulated X-ray light-curve are similar to the observed ones, thus providing support to our scenario. We propose, that the presence of CIRs in donor star winds should be considered in future theoretical and simulation efforts of wind-fed X-ray binaries.
description: Accepted for publication on A&A
title: Marriage
title: Mariage
titleType: AlternativeTitle
Creators: name: Mazaudon, Martine
name: Michailovsky, Boyd
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Limbu
subject: lif

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Hamiltonian framework for short optical pulses
Creators: name: Amiranashvili, Shalva
Publisher: name: Weierstrass Institute
Year: 2014
Subjects: subject: Hamiltonian mechanics
subject: Nonlinear waves
subject: Nonlinear optics
subject: 45.20.Jj
subject: 5.45.-a
subject: 42.65.-k

description: Physics of short optical pulses is an important and active research area in nonlinear optics. In what follows we theoretically consider the most extreme representatives of short pulses that contain only several oscillations of electromagnetic field. Description of such pulses is traditionally based on envelope equations and slowly varying envelope approximation, despite the fact that the envelope is not ?slow? and, moreover, there is no clear definition of such a ?fast? envelope. This happens due to another paradoxical feature: the standard (envelope) generalized nonlinear Schrödinger equation yields very good correspondence to numerical solutions of full Maxwell equations even for few-cycle pulses, a thing that should not be. In what follows we address ultrashort optical pulses using Hamiltonian framework for nonlinear waves. As it appears, the standard optical envelope equation is just a reformulation of general Hamiltonian equations. In a sense, no approximations are required, this is why the generalized nonlinear Schrödinger equation is so effective. Moreover, the Hamiltonian framework greatly contributes to our understanding of ''fast'' envelope, ultrashort solitons, stability and radiation of optical pulses. Even the inclusion of dissipative terms is possible making the Hamiltonian approach an universal theoretical tool also in extreme nonlinear optics.
Nuclear Fragmentation and Its Parallels
Creators: name: Chase, K.
name: Mekjian, A.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A model for the fragmentation of a nucleus is developed. Parallels of the description of this process with other areas are shown which include Feynman's theory of the $λ$ transition in liquid Helium, Bose condensation, and Markov process models used in stochastic networks and polymer physics. These parallels are used to generalize and further develop a previous exactly solvable model of nuclear fragmentation. An analysis of some experimental data is given.
description: 40 pages, REVTEX 3.0, 12 figs. (available in ps files upon request), Preprint #RU9341
Methane resaturation in Barnett Formation core plugs and determination of post-coring gas loss
Creators: name: Enriquez, Daniel Armin
name: 0000-0002-5396-3738
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Lost gas
Resaturation
Methane
Barnett

description: Understanding the physiochemical mechanisms that control the loss of gas during coring processes is critical to accurately determining gas-in-place (GIP) resource assessments of unconventional shale-gas plays. Our study uses an experimental approach, utilizing methane (CH₄) adsorption isotherms and degassing curves of methane-resaturated Barnett Formation core plugs, to determine the amount of lost-gas based on mass-balance analysis at different CH₄ re-saturation pressures and varied exposure times. Several readily available empirical methods for estimating lost-gas were evaluated, quantified, and compared with the mass balance–derived lost-gas values in our experiments. A CH₄ isotherm measurement on 3/8-inch Barnett Formation core plugs was performed at 35.4°C; the amount of gas adsorbed was then quantified and fitted to the modified Langmuir equation to determine the Langmuir maximum, Langmuir constant, and adsorbed gas-phase density. Two sets of CH₄ gas-resaturation and degassing measurements, one varying saturation pressures and the other varying exposure times, were performed on 3/8-inch Barnett Formation core-plugs at an isothermal temperature of 35.4°C. Degassing curves, the plot of the released gas yield versus the square root of degassing time, display three stages that correspond to different gas-releasing mechanisms. The rapid increase of released gas yield at the beginning of degassing represents that nonlinear gas expansion is dominant and that degassing evolves into a linear desorption-dominated phase over time. Experimentally derived values for lost gas were determined by subtracting the sum of the emitted and retained gas at the peak of the degassing curve from the amount of gas initially charged into the samples at equilibrated resaturation pressure. Lost gas varies linearly with increasing gas-resaturation pressure and nonlinearly by a greater magnitude with increasing exposure time, indicating that lost gas is more sensitive to exposure time. The uncertainty evaluation of lost gas determined by three empirical methods was conducted by direct comparison with mass-balance-derived lost-gas values from our experiment. Nonlinear least-squares extrapolation overestimates, and both linear extrapolation and polynomial equation fitting underestimate, mass-balance lost-gas control points. Among the three empirical methods, the polynomial-fitted lost-gas values most closely agree with mass-balance lost gas, revealing that polynomial fitting to degassing curves is a viable way to accurately estimate lost gas and, more importantly, to estimate GIP values with up to 85% accuracy.
Mesh smoothing: An MMPDE approach
Creators: name: Huang, Weizhang
name: Kamenski, Lennard
name: Si, Hang
Publisher: name: Weierstrass Institute
Year: 2015
Subjects: subject: mesh smoothing
subject: moving mesh method
subject: tetrahedral meshes
subject: 65N50
subject: 65K10

description: We study a mesh smoothing algorithm based on the moving mesh PDE (MMPDE) method. For the MMPDE itself, we employ a simple and efficient direct geometric discretization of the underlying meshing functional on simplicial meshes. The nodal mesh velocities can be expressed in a simple, analytical matrix form, which makes the implementation of the method relatively easy and simple. Numerical examples are provided.
Conopidae Latreille 1802
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Conopidae

description: Conopidae   This family of acalyptrate flies contains more than 800 species (Evenhuis & Pape 2020). Rondani (1843d, 1845b, 1850 c, 1856, 1857, 1863, 1865a, 1868a, 1873e, 1874a) described 21 Palaearctic, one Neotropical and one Afrotropical nominal species. Eight of these are currently considered as valid, 13 as junior synonyms and two as doubtful (Papavero 1971, Smith 1980, Chvála & Smith 1988, Rivosecchi & Scaramozzino 1995, Rivosecchi & Mei 1998, Mei & Stuke 2008, Stuke 2016, 2017). Rondani proposed three new substitute names for species previously described and named by other authors and also proposed a new name as a synonym not made available by use as a valid species before 1961 (Rondani 1857, 1874a). Rivosecchi & Mei (1998) designated a lectotype for Sicus femoralis Rondani, 1865, Sphixosoma punctitarsis Rondani, 1865 and Spixosoma aureifasciata Rondani, 1857, all of them in the MZUF. Here, we designate a lectotype for Myopa punctum Rondani, 1857. The type material has been recovered for all nominal species and is distributed among the MZUF (17), MSNC (four), OUMNH (three), MRSN (one), MSNG (one), MSNPV (one), MZUB (one) and MZUN (one).
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 92, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Generalized phase field theories
Creators: name: Gurtin, Morton E.
Publisher: name: Carnegie Mellon University
Year: 1994
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "Using balance laws for microforce and energy in conjunction with constitutive equations consistent with the second law, a general phase-field theory of solidification is developed in which gradients of the order parameter enter the constitutive equations for the internal energy and the entropy. The final results consist of anisotropic and isotropic phase-field equations at various levels of generality."
Are quasi-Monte Carlo algorithms efficient for two-stage stochastic programs?
Creators: name: Heitsch, Holger
name: Leövey, Hernan
name: Römisch, Werner
Publisher: name: Weierstrass Institute
Year: 2016
Subjects: subject: stochastic programming
subject: two-stage
subject: scenario
subject: quasi-Monte Carlo
subject: effective dimension
subject: dimension reduction
subject: 90C15

description: Quasi-Monte Carlo algorithms are studied for designing discrete approximations of two-stage linear stochastic programs with random right-hand side and continuous probability distribution. The latter should allow for a transformation to a distribution with independent marginals. The two-stage integrands are piecewise linear, but neither smooth nor lie in the function spaces considered for QMC error analysis. We show that under some weak geometric condition on the two-stage model all terms of their ANOVA decomposition, except the one of highest order, are continuously differentiable and that first and second order ANOVA terms have mixed first order partial derivatives. Hence, randomly shifted lattice rules (SLR) may achieve the optimal rate of convergence not depending on the dimension if the effective superposition dimension is at most two. We discuss effective dimensions and dimension reduction for two-stage integrands. The geometric condition is shown to be satisfied almost everywhere if the underlying probability distribution is normal and principal component analysis (PCA) is used for transforming the covariance matrix. Numerical experiments for a large scale two-stage stochastic production planning model with normal demand show that indeed convergence rates close to the optimal are achieved when using SLR and randomly scrambled Sobol' point sets accompanied with PCA for dimension reduction.
Fluid inclusion constraints on the hydrothermal processes responsible for Cu-Au mineralization in the Ertsberg East Skarn System, Papua, Indonesia
Creators: name: Ledvina, Matthew Daniel
name: 0000-0003-3717-447X
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Hydrothermal
Fluid Inclusions
Porphyry
Skarn
Copper

description: The Ertsberg East Skarn System (EESS) is a 3-Gt orebody at 0.59% Cu and 0.49 ppm Au that extends from the surface at 4200m at least to 1800m elevation.  Skarn-hosted Cu-Au ores are localized in Upper Cretaceous siliciclastic to Lower Paleogene carbonate strata along the steeply dipping contact with the 3-Ma Ertsberg Diorite that locally hosts stockwork ores. Petrography, quartz SEM-Cathodoluminesence (SEM-CL), fluid inclusion microthermometry, and fluid inclusion LA-ICP-MS were used to characterize vein formation and fluid conditions in the ore-forming system.  Five vein-hosting lithologies and five stages of vein formation were defined petrographically, and 41 SEM-CL transects from 17 quartz vein samples were used to identify eight recurring quartz CL textures that vary by elevation and host lithology.  The CL texture paragenesis reveals quartz-sulfide vein architecture rife with brittle deformation features and evidence of repeated opening and mineralization of fractures.  Brittle deformation increased with depth in diorite-hosted veins and was most prevalent in skarn-hosted veins. Fluid inclusion petrography of 16 samples, in-situ micro-thermometry of 107 fluid inclusions in eight samples, and LA-ICP-MS of 99 inclusions revealed four types of inclusions consistent with Cu-Au porphyry systems. Type 1 inclusions are 4-11% salinity, 40-70 vol% vapor bubble, homogenize between 332-396 C and can contain chalcopyrite daughter crystals. Type 2a inclusions are 27-51% salinity, 10-30 vol% vapor bubble, homogenize between 280-420 C and contain halite. Type 2a inclusions may also contain sylvite, anhydrite, chalcopyrite, magnetite, and hematite. Type 2b inclusions are 1-12% salinity, 65-90 vol% vapor bubble, homogenize between 340-392 C and typically do not contain daughter minerals. Type 3 inclusions at ambient conditions are 2-23% salinity, 15-50 vol% vapor bubble, homogenize between 283-403C and may contain opaque minerals.  LA-ICP-MS analysis indicate that EESS fluid inclusions have high Na, K, and Ca, and support mineralization by Cu, Fe, Mn, Pb and Zn-rich brine derived from phase separation of a primary magmatic fluid.  All fluid inclusion types were observed over the 1.7 km of elevation sampled – nearly 4x the vertical extent documented for other porphyry systems. The upper limit of the phase separation zone is present at ~2500 m, which corresponds with deepest known Cu-Au concentrations. These data support fault-controlled fluid migration and a lack of lithologic control on Cu-Au mineralization in veins.
Long-Term Postmerger Simulations of Binary Neutron Star Coalescence: Formation of Toroidal Remnants and Gravitational Wave Afterglow
Creators: name: Zhang, Xuefeng
name: Cao, Zhoujian
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: It has been estimated that a significant proportion of binary neutron star merger events produce long-lived massive remnants supported by differential rotation and subject to rotational instabilities. To examine formation and oscillation of rapidly rotating neutron stars (NS) after merger, we present an exploratory study of fully general-relativistic hydrodynamic simulations using the public code Einstein Toolkit. The attention is focused on qualitative aspects of long-term postmerger evolution. As simplified test models, we use a moderately stiff Gamma=2 ideal-fluid equation of state and unmagnetized irrotational equal-mass binaries with three masses well below the threshold for prompt collapse. Our high resolution simulations generate postmerger "ringdown" gravitational wave (GW) signals of 170 ms, sustained by rotating massive NS remnants without collapsing to black holes. We observe that the high-density double-core structure inside the remnants gradually turns into a quasi-axisymmetric toroidal shape. It oscillates in a quasi-periodic manner and shrinks in size due to gravitational radiation. In the GW spectrograms, dominant double peaks persist throughout the postmerger simulations and slowly drift to higher frequencies. A new low-frequency peak emerges at about 100 ms after merger, owing to the growth of GW-driven unstable oscillation modes. The long-term effect of grid resolution is also investigated using the same initial model. Moreover, we comment on physical conditions that are favorable for the transient toroidal configuration to form, and discuss implication of our findings on future GW observation targeting rapidly rotating NSs.
description: 26 pages, 11 figures
Jean-Baptiste Paramelle : method, results, and contribution to hydrogeology
Creators: name: Bobeck, Patricia
name: 0000-0002-9893-9571
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Karst
Groundwater
Causses de Quercy
Speleology
Paramelle

description: This study consists of three parts: a translation of Paramelle’s 1856 The Art of Finding Springs; a synthesis of Paramelle’s method, as set out in the book; and an application of his observational method to two karst areas of Texas. Paramelle’s book is a compilation of the observations and experiences gained during 40 years of exploring for water in 40 of France’s departments. Paramelle’s observational method was a scientific advance over water finding methods used in the early 19th century. The breadth and details of Paramelle’s observations are summarized in the second part. Paramelle found shallow water in karst areas by locating the thalweg, the location of focused groundwater flow, and he maintained that beneath every surface thalweg was an underground thalweg. Shallow water could be found in small valleys where the thalweg was easily visible on the surface. Water is abundant where a thalweg joins a stream. He calculated the amount of groundwater present by the size of the recharge area, an area of permeable rock overlying an impermeable layer. He observed the swallet-resurgence connection, the disappearance of a stream into the streambed and its reappearance downstream. Paramelle noted that aligned sinkholes overlay underground conduits and caverns. In part three, Paramelle’s observations are applied to two karst areas of Texas, New Braunfels and the Stockton Plateau. In the New Braunfels area, wells located within 200 m of subsidence areas (coalesced sinkholes) have higher yields than wells located farther from these features. On the Stockton Plateau, the presence of springs in recesses confirms Paramelle’s observations that shallow water is present in small valleys, at permeability contrasts, and downgradient of recharge areas of sufficient size. Paramelle’s scientific observation of rock units and water occurrence provided water for many towns and farms in the 19th century and greatly promoted the use and popularity of groundwater in France. His success in using the observational method is a reminder of the importance of paying attention to observations, especially when they do not support established theories.
Hydrodynamic Modes for a Granular Gas from Kinetic Theory
Creators: name: Brey, J. Javier
name: Dufty, J. W.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Small perturbations of the homogeneous cooling state (HCS) for a low density granular gas are described by means of the linearized Boltzmann equation. The spectrum of the generator for this dynamics is shown to contain points corresponding to hydrodynamic excitations. The corresponding eigenvectors and eigenvalues are calculated to Navier-Stokes order and shown to agree with those obtained by the Chapman-Enskog method. The conditions for the hydrodynamic excitations to dominate all other excitations are discussed.
description: 2 figures
Uncertainty quantification for hysteresis operators and a model for magneto-mechanical hysteresis
Creators: name: Klein, Olaf
Publisher: name: Weierstrass Institute
Year: 2016
Subjects: subject: Magneto-Mechanical Hysteresis
subject: Random Variables
subject: Uncertainty Quantification

description: Many models for magneto-mechanical components involve hysteresis operators. The parameter within these operators have to be identified from measurements and are therefore subject to uncertainties. To quantify the influence of these uncertainties, the parameter in the hysteresis operator are considered as functions of random variables. Combining this with the hysteresis operator, we get new random variables and we can compute stochastic properties of the output of the model. For two hysteresis operators corresponding numerical results are presented in this paper. Moreover, the influence of the variation of the parameters in a model for a magneto-mechanical component is investigated.
Generalized motion by mean curvature with Neumann conditions and the Allen-Cahn model for phase transitions
Creators: name: Katsoulakis, Markos
name: Kossioris, Georgios T.
name: Reitich, Fernando
Publisher: name: Carnegie Mellon University
Year: 1992
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "We study a sharp-interface model for phase transitions that incorporates the interaction of the phase-boundaries with the walls of a container [omega]. In this model the interfaces move by their mean curvature and are normal to [delta omega]. We first establish local-in-time existence and uniqueness of smooth solutions for the mean curvature equation with a normal contact angle condition. We then discuss global solutions by interpreting the equation and the boundary condition in a weak (viscosity) sense. Finally, we investigate the relation of the aforementioned model with a transition-layer model. We prove that if [omega] is convex, the transition-layer solutions converge to the sharp-interface solutions as the thickness of the layer tends to zero. We conclude with a discussion of the difficulties that arise in establishing this result in non-convex domains."
Thermistor systems of p(x)-Laplace-type with discontinuous exponents via entropy solutions
Creators: name: Bulíček, Miroslav
name: Glitzky, Annegret
name: Liero, Matthias
Publisher: name: Weierstrass Institute
Year: 2016
Subjects: subject: Sobolev spaces with variable exponent
subject: existence of weak solution
subject: entropy solution
subject: thermistor system
subject: p(x)-Laplacian
subject: heat transfer
subject: 35J92
subject: 35Q79
subject: 35J57
subject: 80A20

description: We show the existence of solutions to a system of elliptic PDEs, that was recently introduced to describe the electrothermal behavior of organic semiconductor devices. Here, two difficulties appear: (i) the elliptic term in the current-flow equation is of p(x)-Laplacian-type with discontinuous exponent p, which limits the use of standard methods, and (ii) in the heat equation, we have to deal with an a priori L1 term on the right hand side describing the Joule heating in the device. We prove the existence of a weak solution under very weak assumptions on the data. Our existence proof is based on Schauder's fixed point theorem and the concept of entropy solutions for the heat equation. Here, the crucial point is the continuous dependence of the entropy solutions on the data of the problem.
title: Narad in Assam
title: Narad en Assam
titleType: AlternativeTitle
Creators: name: Mazaudon, Martine
name: Michailovsky, Boyd
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Limbu
subject: lif

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7