cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Non-dissipative thermal transport in the massive regimes of the XXZ chain
Creators: name: Sakai, Kazumitsu
name: Kluemper, Andreas
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We present exact results on the thermal conductivity of the one-dimensional spin-1/2 XXZ model in the massive antiferromagnetic and ferromagnetic regimes. The thermal Drude weight is calculated by a lattice path integral formulation. Numerical results for wide ranges of temperature and anisotropy as well as analytical results in the low and high temperature limits are presented. At finite temperature, the thermal Drude weight is finite and hence there is non-dissipative thermal transport even in the massive regime. At low temperature, the thermal Drude weight behaves as $D(T)\sim \exp(-δ/T)/\sqrt{T}$ where $δ$ is the one-spinon (respectively one-magnon) excitation energy for the antiferromagnetic (respectively ferromagnetic) regime.
description: 16 pages
Additional file 3 of Assessing the quality of health research from an Indigenous perspective: the Aboriginal and Torres Strait Islander quality appraisal tool
Creators: name: Harfield, Stephen
name: Pearson, Odette
name: Morey, Kim
name: Kite, Elaine
name: Canuto, Karla
name: Glover, Karen
name: Gomersall, Judith Streak
name: Carter, Drew
name: Davy, Carol
name: Aromataris, Edoardo
name: Braunack-Mayer, Annette
Publisher: name: figshare
Year: 2020
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Marine Biology
subject: Science Policy

description: Additional file 3.
Geodesic motion in the Kundt spacetimes and the character of envelope singularity
Creators: name: Podolsky, Jiri
name: Belan, Miroslav
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate geodesics in specific Kundt type N (or conformally flat) solutions to Einstein's equations. Components of the curvature tensor in parallelly transported tetrads are then explicitly evaluated and analyzed. This elucidates some interesting global properties of the spacetimes, such as an inherent rotation of the wave-propagation direction, or the character of singularities. In particular, we demonstrate that the characteristic envelope singularity of the rotated wave-fronts is a (non-scalar) curvature singularity, although all scalar invariants of the Riemann tensor vanish there.
description: 21 pages, 3 figures. To appear in Class. Quantum Grav
Aspherical manifolds, relative hyperbolicity, simplicial volume and assembly maps
Creators: name: Belegradek, Igor
Publisher: name: arXiv
Year: 2005
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F65

description: This paper contains examples of closed aspherical manifolds obtained as a by-product of recent work by the author [arXiv:math.GR/0509490] on the relative strict hyperbolization of polyhedra. The following is proved. (I) Any closed aspherical triangulated n-manifold M^n with hyperbolic fundamental group is a retract of a closed aspherical triangulated (n+1)-manifold N^(n+1) with hyperbolic fundamental group. (II) If B_1,...,B_m are closed aspherical triangulated n-manifolds, then there is a closed aspherical triangulated manifold N of dimension n+1 such that N has nonzero simplicial volume, N retracts to each B_k, and π_1(N) is hyperbolic relative to π_1(B_k)'s. (III) Any finite aspherical simplicial complex is a retract of a closed aspherical triangulated manifold with positive simplicial volume and non-elementary relatively hyperbolic fundamental group.
description: This is the version published by Algebraic & Geometric Topology on 20 September 2006
How do substitute teachers substitute? An empirical study of substitute teacher labor supply
Creators: name: Gershenson, Seth
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 38
subject: Economics
classificationCode: 39
subject: Education

description: This paper examines the daily labor supply of a potentially important, but often overlooked, source of instruction in U.S. public schools: substitute teachers. I estimate a sequential binary-choice model of substitute teachers’ job-offer acceptance decisions using data on job offers made by a randomized automated calling system. Importantly, this randomization generates exogenous variation in offer quality. I find that determinants of substitutes’ offer-acceptance decisions include the offer’s arrival time, commute time, day of week, classroom type, school type, and school quality. Interestingly, conditional on school quality student demographics do not significantly influence substitutes’ decisions. Longer and higher paying full-day jobs are preferred to half-day jobs, although conditional on daily pay, job length does not significantly impact daily labor-supply decisions. Preferences for several job characteristics are found to vary with substitutes’ regular-teacher certification status. Policy implications of these findings are discussed.
Additional file 1 of Biological and morphological consequences of dsRNA-induced suppression of tetraspanin mRNA in developmental stages of Echinococcus granulosus
Creators: name: Mousavi, Seyed Mohammad
name: Afgar, Ali
name: Mohammadi, Mohammad Ali
name: Seifollah Mortezaei
name: Ashkan Faridi
name: Balal Sadeghi
name: Harandi, Majid Fasihi
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Computational Biology

description: Additional file 1: Figure S1. Agarose gel electrophoresis of EgTSP1-specific dsRNA produced in Echinococcus granulosus. Lane A: ladder; Lane B: control (500 bp); Lane C: dsRNA (1065 bp).
STRUCTURAL CHANGES UNDER CONDITIONS OF CHANGING RELATIVE PROFITABILITY OF ENTERPRISES
Creators: name: Van Der Westhuyzen, B.
name: Kleynhans, T. E.
name: Van Der Westhuyzen, B.
name: Kleynhans, T. E.
Publisher: name: Unknown
Year: 1987
Subjects: Agricultural and Food Policy
Industrial Organization

description: The striving for higher profit in farming, or at least the maintaining of profit, sometimes requires drastic changes in the existing farming system. On exceeding the marginal values of a parameter, the relative profitability between enterprises changes in such a way that structural changes are necessary to comply with this effort. These structural changes result in a shift in emphasis in the importance of -enterprises in the farming composition. . When the marginal values of a parameter are therefore exceeded and these structural changes in the farming composition are not made, this leads to sub-optimum allocation of resources in farming. Such action runs counter to the aim for higher profit, or maintaining profit in the agricultural organisation. The farmer is required to be aware of the importance of the respective parameters for the relative profitability of enterprises and to react to medium to long-term price trends by making necessary adaptations in the farming system.
Additional file 2 of Assessing the quality of health research from an Indigenous perspective: the Aboriginal and Torres Strait Islander quality appraisal tool
Creators: name: Harfield, Stephen
name: Pearson, Odette
name: Morey, Kim
name: Kite, Elaine
name: Canuto, Karla
name: Glover, Karen
name: Gomersall, Judith Streak
name: Carter, Drew
name: Davy, Carol
name: Aromataris, Edoardo
name: Braunack-Mayer, Annette
Publisher: name: figshare
Year: 2020
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Marine Biology
subject: Science Policy

description: Additional file 2.
The implications of summer learning loss for value-added estimates of teacher effectiveness
Creators: name: Gershenson, Seth
name: Hayes, Michael S.
Publisher: name: American University
Year: 2023

description: School districts across the United States increasingly use value-added models (VAMs) to evaluate teachers. In practice, VAMs typically rely on lagged test scores from the previous academic year, which necessarily conflate summer with school-year learning and potentially bias estimates of teacher effectiveness. We investigate the practical implications of this problem by comparing estimates from “cross-year” VAMs to those from arguably more valid “within-year” VAMs using fall and spring test scores from the nationally representative Early Childhood Longitudinal Study – Kindergarten Cohort (ECLS-K). “Cross-year” and “within-year” VAMs frequently yield significant differences that remain even after conditioning on participation in summer activities.
Eigenvalues of non-hermitian matrices: a dynamical and an iterative approach. Application to a truncated Swanson model
Creators: name: Bagarello, Fabio
name: Gargano, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We propose two different strategies to find eigenvalues and eigenvectors of a given, not necessarily Hermitian, matrix $A$. Our methods apply also to the case of complex eigenvalues, making the strategies interesting for applications to physics, and to pseudo-hermitian quantum mechanics in particular. We first consider a {\em dynamical} approach, based on a pair of ordinary differential equations defined in terms of the matrix $A$ and of its adjoint $A^\dagger$. Then we consider an extension of the so-called power method, for which we prove a fixed point theorem for $A\neq A^\dagger$ useful in the determination of the eigenvalues of $A$ and $A^\dagger$. The two strategies are applied to some explicit problems. In particular, we compute the eigenvalues and the eigenvectors of the matrix arising from a recently proposed quantum mechanical system, the {\em truncated Swanson model}, and we check some asymptotic features of the Hessenberg matrix.
A Lagrange Multiplier Test for Garch Models
Creators: name: Lee, John H. H.
name: Lee, John H. H.
Publisher: name: Unknown
Year: 1991
Subjects: subject: Research and Development/Tech Change/Emerging Technologies
subject: Lagrange multiplier test
subject: linear regression model
subject: GARCH models
subject: singular information matrix

description: This paper extends the Lagrange multiplier (LM) test to testing white noise disturbances against GARCH disturbances in the linear regression model. The resulting LM test for the GARCH alternative is identical to the LM test for an ARCH alternative.
Consistent nonlinear dynamics: identifying model inadequacy
Creators: name: McSharry, Patrick E.
name: Smith, Leonard A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Empirical modelling often aims for the simplest model consistent with the data. A new technique is presented which quantifies the consistency of the model dynamics as a function of location in state space. As is well-known, traditional statistics of nonlinear models like root-mean-square (RMS) forecast error can prove misleading. Testing consistency is shown to overcome some of the deficiencies of RMS error, both within the perfect model scenario and when applied to data from several physical systems using previously published models. In particular, testing for consistent nonlinear dynamics provides insight towards (i) identifying when a delay reconstruction fails to be an embedding, (ii) allowing state dependent model selection and (iii) optimising local neighbourhood size. It also provides a more relevant (state dependent) threshold for identifying false nearest neighbours.
description: 40 pages, 14 figures
Linking teacher quality, student attendance, and student achievement
Creators: name: Gershenson, Seth
Publisher: name: American University
Year: 2023

description: Research on the effectiveness of educational inputs, particularly research on teacher effectiveness, typically overlooks teachers’ potential impact on behavioral outcomes such as student attendance. Using longitudinal data on teachers and students in North Carolina I estimate teacher effects on primary school student absences in a value-added framework. The analysis yields two main findings: First, teachers have arguably causal, statistically significant effects on student absences that persist over time. Second, teachers who improve test scores do not necessarily improve student attendance, suggesting that effective teaching is multidimensional and teachers who are effective in one domain are not necessarily effective in others.
Addition material for Using Nanopublications to Detect and Explain Contradictory Research Claims
Creators: name: Asif, Imran
name: Gray, Alasdair J G
name: Tiddi, Ilaria
Publisher: name: Zenodo
Year: 2021
Subjects: nanopublication
jupyter notebook
CoDa
contradictory claim

description: We tackle the problem of automatically detecting conflicting claims in research outputs. This has become even more urgent in recent years, with the increasing volume of scientific publications available. Researchers are struggling to keep pace with the literature, and to efficiently make comparisons between the results of different published studies. We hypothesise that the difficult and time-consuming process of searching and comparing results across research publications can be facilitated using machine-readable, standardised knowledge representation methods. To this end, we propose to exploit Nanopublications as the standard framework to represent the claims in research studies, and use provenance data expressed by the model as an indicator of the source of the contradiction between different claims. We evaluate this idea over the Cooperation Databank (CoDa); a repository of social science studies. Our results show that the use of provenance information can be a good factor to identify the cause of conflicting claims, and that our method can support scientists in comparing literature in a more automated way.
Statistical analysis of Galactic globular cluster type properties
Creators: name: Simioni, Matteo
name: Aparicio, Antonio
name: Piotto, Giampaolo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The analysis of pseudo-colour diagrams, the so-called chromosome maps, of Galactic globular clusters (GCs) permits to classify them into type I and type II clusters. Type II GCs are characterized by an above-the-average complexity of their chromosome maps and some of them are known to display star-to-star variations of slow neutron-capture reaction elements including iron. This is at the basis of the hypothesis that type II GCs may have an extragalactic origin and were subsequently accreted by the Milky Way. We performed a Principal Component Analysis to explore possible correlations among various GCs parameters in the light of this new classification. The analysis revealed that cluster type correlates mainly with relative age. The cause of this relation was further investigated finding that more metal-rich type II clusters, also appear to be younger and more distant from the Galactic centre. A depletion of type II clusters for positive values of Galactic coordinate Z was also observed, with no type II clusters detected above Z$\sim2$ kpc. Type II cluster orbits also have larger eccentricities than type I ones.
description: 10 pages, 6 figures. Accepted for publication in MNRAS
Universality Class of Ferromagnetic Transition in Three-Dimensional Double-Exchange System - O(N) Monte Carlo Study -
Creators: name: Motome, Yukitoshi
name: Furukawa, Nobuo
Publisher: name: arXiv
Year: 2003
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Curie temperature and exponents are studied for the three-dimensional double-exchange model. Applying the O(N) Monte Carlo algorithm, we perform systematic finite-size scaling analyses on the data up to $20^3$ sites. The obtained values of the critical exponents are consistent with those of the Heisenberg universality class, and clearly distinct from the mean-field values.
description: 3 pages including 2 figures
GRASPA 1.0: GRASPA is a Robot Arm graSping Performance benchmArk
Creators: name: Bottarel, Fabrizio
name: Vezzani, Giulia
name: Pattacini, Ugo
name: Natale, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The use of benchmarks is a widespread and scientifically meaningful practice to validate performance of different approaches to the same task. In the context of robot grasping the use of common object sets has emerged in recent years, however no dominant protocols and metrics to test grasping pipelines have taken root yet. In this paper, we present version 1.0 of GRASPA, a benchmark to test effectiveness of grasping pipelines on physical robot setups. This approach tackles the complexity of such pipelines by proposing different metrics that account for the features and limits of the test platform. As an example application, we deploy GRASPA on the iCub humanoid robot and use it to benchmark our grasping pipeline. As closing remarks, we discuss how the GRASPA indicators we obtained as outcome can provide insight into how different steps of the pipeline affect the overall grasping performance.
description: To cite this work, please refer to the journal reference entry. For more information, code, pictures and video please visit https://github.com/robotology/GRASPA-benchmark
Identifying sustainability : the UBC Model Food System example
Creators: name: Cheng, Mona
name: Gfeller, Joel
name: Klaponski, Matthew
name: May, Lisa
name: Pittaway, Margot
name: Stanley, Taeya
name: Sun, Julianne
Publisher: name: The University of British Columbia
Year: 2014

description: Universities have the responsibility to be the leaders of social change through initiatives that respond to current social, economic, environmental and moral values. The University of British Columbia has an opportunity to lead the research of sustainable food systems through the development and study of a Model Food System. This system will incorporate the local UBC farm, a Community Kitchen and a strong community component of students, faculty and concerned Food Citizens. Our research proposal outlines the measures necessary to create and study this Model Food System (MFS). It is our belief that through this study the University will benefit from decreased operating costs, higher nutritional and social value of food menus, and a strong community linkage. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
New Keck Observations of Lithium in Very Metal-poor Stars
Creators: name: Boesgaard, Ann Merchant
name: Novicki, Megan C.
name: Stephens, Alex
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Lithium abundances have been determined in more than 100 metal-poor halo stars both in the field and in clusters. From these data we find trends of Li with both temperature and metallicity and a real dispersion in Li abundances in the Spite Li plateau. We attribute this dispersion primarily to Li depletion (presumably due to extra mixing induced by stellar rotation) and to Galactic chemical evolution. We derive a primordial Li of 2.44 $\pm$0.18 for A(Li)$_p$ = log N(Li/H) + 12.00. This agrees with the Li abundances predicted by the $WMAP$ results. For stars cooler than the Li plateau we have evidence that Li depletion sets in at hotter temperatures for the higher metallicity stars than for the low-metal stars. This is the opposite sense of predictions from stellar models. The smooth transition of the Li content from the Li plateau stars to the cool stars adds weight to the inference of Li depletion in the plateau stars.
description: Invited talk for IAU Symposium 228 "From Lithium to Uranium..." held in Paris in May, 2005. 6 pages, 6 figures
Milky Way globular cluster dynamics: are they preferentially co-rotating?
Creators: name: Das, Saikat
name: Roy, Nirupam
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The motion of the baryonic components of the Milky Way is governed by both luminous and dark matter content of the Galaxy. Thus, the dynamics of the Milky Way globular clusters can be used as tracers to infer the mass model of the Galaxy up to a large radius. In this work, we use the directly observable line-of-sight velocities to test if the dynamics of the globular cluster population is consistent with an assumed axisymmetric gravitational potential of the Milky Way. For this, we numerically compute the phase space distribution of the globular cluster population where the orbits are either oriented randomly or co-/counter- rotating with respect to the stellar disk. Then we compare the observed position and line-of-sight velocity distribution of $\sim$ 150 globular clusters with that of the models. We found that, for the adopted mass model, the co-rotating scenario is the favored model based on various statistical tests. We do the analysis with and without the GCs associated to the progenitors of early merger events. This analysis can be extended in the near future to include precise and copious data to better constrain the Galactic potential up to a large radius.
description: 7 pages, 4 figures, Accepted for publication in RAA
Direct Domain Decomposition Method (D3M) for Finite Element Electromagnetic Computations
Creators: name: Moshfegh, Javad
name: Vouvakis, Marinos N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: An exact arithmetic, memory efficient direct solution method for finite element method (FEM) computations is outlined. Unlike conventional black-box or low-rank direct solvers that are opaque to the underlying physical problem, the proposed method leverages physical insights at every stage of the development through a new symmetric domain decomposition method (DDM) with one set of Lagrange multipliers. Comparisons with state-of-the-art exact direct solvers on electrically large problems suggest up to 10 times less memory and better run-time complexity while maintaining the same accuracy.
description: 3 pages, 3 figures, 2016 IEEE APS/URSI
The implications of summer learning loss for value-added estimates of teacher effectiveness
Creators: name: Gershenson, Seth
name: Hayes, Michael S.
Publisher: name: Educational Policy
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: School districts across the United States increasingly use value-added models (VAMs) to evaluate teachers. In practice, VAMs typically rely on lagged test scores from the previous academic year, which necessarily conflate summer with school-year learning and potentially bias estimates of teacher effectiveness. We investigate the practical implications of this problem by comparing estimates from “cross-year” VAMs to those from arguably more valid “within-year” VAMs using fall and spring test scores from the nationally representative Early Childhood Longitudinal Study – Kindergarten Cohort (ECLS-K). “Cross-year” and “within-year” VAMs frequently yield significant differences that remain even after conditioning on participation in summer activities.
The UBC Food System : indicators in the measurement of sustainability
Creators: name: Brighten, Caryn
name: Ducommun, Michelle
name: Hui, Cecilia
name: Lau, Jessica
name: Ngai, June
name: Setianto, Jennifer
name: Warrington, Tanya
Publisher: name: The University of British Columbia
Year: 2014

description: Sustainability is a term that can be challenging to define. Our group believes that a sustainable food system, though, would be one that is economically viable, and that meets the community’s needs for safe and nutritious foods, while conserving or enhancing its natural resources and environmental quality. In order to create a sustainable UBC Food System, our group truly believes that a maximum amount of recycling and composting must be done by the community, to preserve what we deem particularly important, environmental integrity. Other indicators of sustainability would be the amount of knowledge the UBC Community has of their food system, the availability and accessibility of food to the community, the prices of food on campus, UBC Food Services being a profitable business, and food bought for the UBC Community travelling as little as possible to reach campus. From these indicators, we have devised a model to measure, on a continuum, the sustainability of our food system. In the future, it is our hope that Land, Food and Community III classes can perform research, with this year’s AGSC 450 models in mind, to evaluate the UBC Food System’s sustainability, and to provide proposals of how to shift the state of our food system from its current position to a more sustainable one. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”
title: Human and climate impacts on tropical Andean ecosystems
Creators: name: Williams, Joseph James
Publisher: name: The Open University
Year: 2011

description: Population growth and predicted global climate change are applying new, and increasing, pressure to mountain environments, but the consequences of these changes upon the biodiverse and vulnerable Tropical Andean ecosystems are poorly understood. This thesis explores past human-climate-ecosystem interactions using multi-proxy palaeolimnological investigations (fossil pollen, spore, charcoal and Chironomidae (midges); elemental abundance, colour spectra and magnetic susceptibility) of two sites in the eastern Bolivian Andes (Lake Challacaba and Laguna Khomer Kocha Upper) over the last c. 18,000 years. During the deglaciation and Holocene, ecosystems were exposed to varying climatic stress levels, and pressures imposed by the development of human cultures. Examination of preserved ecological assemblages, including the first assessment of subfossil central Andean Chironomidae, reveals ecosystem sensitivity to changes in temperature, moisture, fire regime, lake level, nutrients and salinity. Charcoal analysis from Laguna Khomer Kotcha Upper reveals changes in burning at c. 14,500, 10,100 and 6,400 cal yr BP. Concomitant palynological shifts shows climatically controlled fire regime was a transformative agent of Andean vegetation, particularly for the threatened, high elevation, Polylepis woodlands. Pollen and geochemical data from Lake Challacaba indicate two periods of aridity (c. 4,000-3,370 and 2,190-1,020 cal yr BP), these broadly correlated to El Nino/Southern Oscillation variations. Increased Sporormiella abundance after c. 1,340 cal yr BP indicate changes in trade-route use and agricultural practices; demonstrating human adaptation to environmental change and interconnectivity to Tiwanaku and Inca civilizations. The long-term response of the terrestrial and aquatic ecosystems, reconstructed from these lakes, has provided insights into how Tropical Andean ecosystems may respond to future changes in temperature, precipitation and human interference. The palaeoenvironmental data has implications for conservation management; it indicates that spatial and temporal variations in site sensitivity, exposure and resilience should be assessed, and that planting strategies should mimic the present day natural patchy distribution of Polylepis woodlands.
Direct Solution of FEM Models: Are Sparse Direct Solvers the Best Strategy?
Creators: name: Moshfegh, Javad
name: Vouvakis, Marinos N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: A brief summary of direct solution approaches for finite element methods (FEM) in computational electromagnetics (CEM) is given along with an alternative direct solution based on domain decomposition (DD). Unlike recent trends in approximate/low-rank solvers, this work focuses on `numerically exact' solution methods as they are more reliable for complex `real-life' models. Preliminary studies on general three dimensional geometries with unstructured FEM meshes suggest that the proposed direct DD methodology offers significant memory advantages over highly optimized, high-performance sparse direct solver libraries, while maintaining approximately comparable or slightly slower serial serial execution speed but with significantly better parallel and GPU processing prospects.
description: 3 pages, 3 figures, 2017 ICEAA
Reentrant Behavior of the Spinodal Curve in a Nonequilibrium Ferromagnet
Creators: name: Hurtado, P. I.
name: Marro, J.
name: Garrido, P. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The metastable behavior of a kinetic Ising--like ferromagnetic model system in which a generic type of microscopic disorder induces nonequilibrium steady states is studied by computer simulation and a mean--field approach. We pay attention, in particular, to the spinodal curve or intrinsic coercive field that separates the metastable region from the unstable one. We find that, under strong nonequilibrium conditions, this exhibits reentrant behavior as a function of temperature. That is, metastability does not happen in this regime for both low and high temperatures, but instead emerges for intermediate temperature, as a consequence of the non-linear interplay between thermal and nonequilibrium fluctuations. We argue that this behavior, which is in contrast with equilibrium phenomenology and could occur in actual impure specimens, might be related to the presence of an effective multiplicative noise in the system.
description: 7 pages, 4 figures; Final version to appear in Phys. Rev. E; Section V has been revised
Paridad en todos lados. Avances de la democracia paritaria en Argentina
Creators: name: Santamarina, Sofia
name: Beraud, Gabriel
Publisher: name: figshare
Year: 2021
Subjects: subject: 160699 Political Science not elsewhere classified
subject: FOS: Political science

description: Las leyes de cuotas o paridad son definidas como políticas de equidad que buscan eliminar la discriminación contra la mujer en la vida política y asegurar sus derechos políticos mediante acciones afirmativas que establecen porcentajes mínimos de mujeres que los partidos políticos deben incorporar en sus listas de candidatos/as. En Argentina, a partir de la sanción de la Ley de Cupo Femenino en 1991 (Ley N° 24.012) las provincias han ido armonizando sus normativas electorales para ampliar los derechos políticos de las mujeres, incluso varias de ellas incorporaron la paridad antes que a nivel nacional. Partiendo de la compleja realidad institucional federal este trabajo tiene el objetivo de identificar los avances normativos en materia de paridad de géneros en el ámbito de la política argentina. Para medir estos avances, nos centramos en tres aspectos: la robustez del diseño de las leyes de paridad política, las estrategias que se han desarrollado para impedir u obstaculizar el cumplimiento de las leyes y la ampliación del principio de paridad hacia otros ámbitos no electorales, en tanto principio democrático y compromiso asumido por el Estado.
Measuring New-Physics Parameters in B Penguin Decays
Creators: name: Datta, Alakabha
name: London, David
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We examine new-physics (NP) effects in B decays with large b -> s penguin amplitudes. Decays involving b -> d penguins are assumed to be unaffected. We consider a model-independent parametrization of such NP. We argue that NP strong phases are negligible relative to those of the standard model. This allows us to describe the NP effects in terms of a small number of effective amplitudes A_NP^q (q=u,d,s,c) and corresponding weak phases Phi_q. We then consider pairs of neutral B decays which are related by flavour SU(3) in the standard model. One receives a large b -> s penguin component and has a NP contribution; the other has a b -> d penguin amplitude and is unaffected by NP. The time-dependent measurement of these two decays allows the {\it measurement} of the NP parameters A_NP^q and Phi_q. The knowledge of these parameters allows us to rule out many NP models and thus partially identify the new physics.
description: 13 pages, latex, no figures. Paper rewritten in letter format. Shortened considerably. Analysis and conclusions unchanged. To be published in Physics Letters B
Paridad en todos lados. Avances de la democracia paritaria en Argentina.pdf
Creators: name: Santamarina, Sofia
name: Beraud, Gabriel
Publisher: name: figshare
Year: 2021
Subjects: subject: 160699 Political Science not elsewhere classified
subject: FOS: Political science

description: Las leyes de cuotas o paridad son definidas como políticas de equidad que buscan eliminar la discriminación contra la mujer en la vida política y asegurar sus derechos políticos mediante acciones afirmativas que establecen porcentajes mínimos de mujeres que los partidos políticos deben incorporar en sus listas de candidatos/as. En Argentina, a partir de la sanción de la Ley de Cupo Femenino en 1991 (Ley N° 24.012) las provincias han ido armonizando sus normativas electorales para ampliar los derechos políticos de las mujeres, incluso varias de ellas incorporaron la paridad antes que a nivel nacional. Partiendo de la compleja realidad institucional federal este trabajo tiene el objetivo de identificar los avances normativos en materia de paridad de géneros en el ámbito de la política argentina. Para medir estos avances, nos centramos en tres aspectos: la robustez del diseño de las leyes de paridad política, las estrategias que se han desarrollado para impedir u obstaculizar el cumplimiento de las leyes y la ampliación del principio de paridad hacia otros ámbitos no electorales, en tanto principio democrático y compromiso asumido por el Estado.
Competition of Superconductivity and Magnetism in MoSr2R1.5Ce0.5Cu2O10-d (R=Rare-earth, Mo-1222)
Creators: name: Felner, I.
name: Galstyan, E.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have investigated the MoSr2R1.5Ce0.5Cu2O10-d (Mo-1222R, R=rare earth) system by several complementary experimental techniques. In contrast to the iso-structural RuSr2R1.5Ce0.5Cu2O10-d (Ru-1222) system, in which superconductivity (SC) in the CuO2 planes and weak-ferromagnetism in the Ru sub-lattice coexists, in Mo-1222, displays a competition between the two states, namely, SC vanishes when the magnetic order sets in. The contraction in the R elements leads to a change of the physical states. The light R ions (Pr and Nd) are paramagnetic down to 5 K, whereas the middle R ions (Sm and Eu) are SC at TC 18-23 K respectively. The SC charge carriers originate from the CuO2 planes, and annealing under oxygen pressures does not affect TC. A simple model for the SC state is proposed. For the heavy R elements Ho-Lu and Y, the pentavalent Mo layers are antiferromagnetically (AFM) ordered at TN ranging from 13-26 K. For R=Gd, the sample is not SC and exhibit two magnetic transitions at 11 and 184 K. Both the SC or AFM states depend strongly on the R/Ce ratio and for R/Ce=1, both states are suppressed.
description: 4 pages, 4 figures, submitted to PRB
Linking teacher quality, student attendance, and student achievement
Creators: name: Gershenson, Seth
Publisher: name: Education Finance and Policy
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: Research on the effectiveness of educational inputs, particularly research on teacher effectiveness, typically overlooks teachers’ potential impact on behavioral outcomes such as student attendance. Using longitudinal data on teachers and students in North Carolina I estimate teacher effects on primary school student absences in a value-added framework. The analysis yields two main findings: First, teachers have arguably causal, statistically significant effects on student absences that persist over time. Second, teachers who improve test scores do not necessarily improve student attendance, suggesting that effective teaching is multidimensional and teachers who are effective in one domain are not necessarily effective in others.
Stable gravastars with generalised exteriors
Creators: name: Carter, Benedict M. N.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: New spherically symmetric gravastar solutions, stable to radial perturbations, are found by utilising the construction of Visser and Wiltshire. The solutions possess an anti--de Sitter or de Sitter interior and a Schwarzschild--(anti)--de Sitter or Reissner--Nordström exterior. We find a wide range of parameters which allow stable gravastar solutions, and present the different qualitative behaviours of the equation of state for these parameters.
description: 14 pages, 11 figures, to appear in Classical and Quantum Gravity
Parental involvement, summer activities, and the intergenerational transmission of educational attainment
Creators: name: Hardy, Bradley
name: Gershenson, Seth
Publisher: name: American University (Washington, D.C.)
Year: 2023
Subjects: classificationCode: 39
subject: Education
classificationCode: 3904
subject: Specialist studies in education

description: Several authors have speculated that better-educated parents’ higher levels of parental involvement may influence the intergenerational transmission of education; however, this hypothesis has yet to be formally tested. We begin to fill this gap in the literature by estimating augmented intergenerational mobility models that include measures of parental involvement and children’s participation in “school-like” summer activities using rich data from the Child and Young Adult Supplement to the National Longitudinal Survey (NLSY79). Participation in organized summer activities is directly associated with children’s educational attainment, as is the frequency with which mothers read to children. Much of the correlation between mothers’ and children’s education is driven by college-educated mothers reading to their children and facilitating their children’s participation in stimulating summer activities. The relationship between participation in organized activities and educational attainment is stronger for children in wealthier households, girls, and children of married parents. Policy implications are discussed.
Locally Optimal Testing When a Nuisance Parameter is Present Only Under the Alternative
Creators: name: King, Maxwell L.
name: Shively, Thomas S.
name: King, Maxwell L.
name: Shively, Thomas S.
Publisher: name: Unknown
Year: 1991
Subjects: Research Methods/ Statistical Methods

description: We consider hypothesis testing problems in which a nuisance parameter is present only under the alternative hypothesis. Standard asymptotic tests, such as likelihood ratio, Lagrange multiplier and Wald tests, are difficult to apply because of problems incurred in obtaining their asymptotic distributions. To overcome this difficulty, we reparameterize the testing problem to one for which an exact small sample test can be constructed using existing hypothesis testing procedures. The reparameterization technique is applied to two examples from the econometrics literature, and an empirical power comparison shows that our test has better power properties than tests previously proposed in the literature. Further, p-values for our test can be computed in 0(n) operations so the test can be implemented efficiently.
Least square channel estimation for image transmission with ofdm over fading channel
Creators: name: M, Usha S.
name: B, Mahesh H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Wireless communication is the most effective communication to convey audio or video information among the population. It enables the masses to connect throughout the world. Wireless technologies improve the lifestyle of individuals in rural and poor communication areas. In this view, the quality of a reliable signal can be enhanced by minimizing carrier interference. In this paper bit error rate of an image, signal is transmitted over fading channel is analyzed using orthogonal frequency multiplexing and channel estimation technique. An Orthogonal Frequency Multiplexing (OFDM) provides prominent bandwidth effectiveness and improved immunity to the fading environments. In OFDM, the data is modulated using multiple numbers of subcarriers that are orthogonal to each other. A cyclic prefix is infixed between OFDM symbols to annihilate the inter symbol interference (ISI) and inter-carrier interference (ICI). The least square channel estimation method is used to minimize the effect of multipath fading. An image, signal is modulated using BPSK, QPSK, 16QAM and 64QAM digital modulation schemes with OFDM and channel estimation and transmitted over AWGN and fading channel. The objective of this work is to improve the signal to noise ratio by reducing interference.
description: no comments
Lie Point Symmetries for Reduced Ermakov Systems
Creators: name: Haas, F.
name: Goedert, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: Reduced Ermakov systems are defined as Ermakov systems restricted to the level surfaces of the Ermakov invariant. The condition for Lie point symmetries for reduced Ermakov systems is solved yielding four infinite families of systems. It is shown that SL(2,R) always is a group of point symmetries for the reduced Ermakov systems. The theory is applied to a model example and to the equations of motion of an ion under a generalized Paul trap.
Parental involvement, summer activities, and the intergenerational transmission of educational attainment
Creators: name: Hardy, Bradley
name: Gershenson, Seth
Publisher: name: American University
Year: 2023

description: Several authors have speculated that better-educated parents’ higher levels of parental involvement may influence the intergenerational transmission of education; however, this hypothesis has yet to be formally tested. We begin to fill this gap in the literature by estimating augmented intergenerational mobility models that include measures of parental involvement and children’s participation in “school-like” summer activities using rich data from the Child and Young Adult Supplement to the National Longitudinal Survey (NLSY79). Participation in organized summer activities is directly associated with children’s educational attainment, as is the frequency with which mothers read to children. Much of the correlation between mothers’ and children’s education is driven by college-educated mothers reading to their children and facilitating their children’s participation in stimulating summer activities. The relationship between participation in organized activities and educational attainment is stronger for children in wealthier households, girls, and children of married parents. Policy implications are discussed.
Power spectrum of many impurities in a d-wave superconductor
Creators: name: Zhu, Lingyin
name: Atkinson, W. A.
name: Hirschfeld, P. J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Recently the structure of the measured local density of states power spectrum of a small area of the \BSCCO (BSCCO) surface has been interpreted in terms of peaks at an "octet" of scattering wave vectors determined assuming weak, noninterfering scattering centers. Using analytical arguments and numerical solutions of the Bogoliubov-de Gennes equations, we discuss how the interference between many impurities in a d-wave superconductor alters this scenario. We propose that the peaks observed in the power spectrum are not the features identified in the simpler analyses, but rather "background" structures which disperse along with the octet vectors. We further consider how our results constrain the form of the actual disorder potential found in this material.
description: 5 pages.2 figures
Additional file 1 of Assessing the quality of health research from an Indigenous perspective: the Aboriginal and Torres Strait Islander quality appraisal tool
Creators: name: Harfield, Stephen
name: Pearson, Odette
name: Morey, Kim
name: Kite, Elaine
name: Canuto, Karla
name: Glover, Karen
name: Gomersall, Judith Streak
name: Carter, Drew
name: Davy, Carol
name: Aromataris, Edoardo
name: Braunack-Mayer, Annette
Publisher: name: figshare
Year: 2020
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Marine Biology
subject: Science Policy

description: Additional file 1.
The Blume-Emery-Griffiths neural network: dynamics for arbitrary temperature
Creators: name: Bolle, D.
name: Blanco, J. Busquets
name: Shim, G. M.
name: Verbeiren, T.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The parallel dynamics of the fully connected Blume-Emery-Griffiths neural network model is studied for arbitrary temperature. By employing a probabilistic signal-to-noise approach, a recursive scheme is found determining the time evolution of the distribution of the local fields and, hence, the evolution of the order parameters. A comparison of this approach is made with the generating functional method, allowing to calculate any physical relevant quantity as a function of time. Explicit analytic formula are given in both methods for the first few time steps of the dynamics. Up to the third time step the results are identical. Some arguments are presented why beyond the third time step the results differ for certain values of the model parameters. Furthermore, fixed-point equations are derived in the stationary limit. Numerical simulations confirm our theoretical findings.
description: 26 pages in Latex, 8 eps figures