bluuebunny/crossref_metadata_2025_split huggingface dataset:
ANÁLISE DA COMPREENSÃO SOBRE FORMAÇÃO DE PROFESSORES DESENVOLVIDA POR PÓS-GRADUANDOS DA ÁREA DE ENSINO DE MATEMÁTICA
Authors: Proença Marcelo Carlos de 
Published: September 2019

O objetivo foi analisar a compreensão sobre formação de professores desenvolvida por pós-graduandos. Participaram da pesquisa, oito pós-graduandos da área de Ensino de Matemática, matriculados em uma disciplina sobre formação de professores que ensinam Matemática. Após as aulas dessa disciplina, aplicamos um questionário com duas perguntas. Os resultados mostraram que a compreensão dos participantes sobre formação de professores resultou em três ideias importantes: como desenvolvimento profissional, como constituição de saberes docentes, e como valorização da prática. No caso da compreensão sobre as lacunas na formação inicial de professores, os resultados mostraram que os participantes apontaram a necessidade de reestruturação de saberes pedagógicos edisciplinarese de rever a formação do formador. Já sobre as lacunas na formação continuada de professores, a compreensão dos participantes revelou a necessidade de um reequilíbrio teórico-práticoe de entender a profissão professor como formação contínua. Concluímos que as compreensões desenvolvidas pelos pós-graduandos situam a formação de professores como um processo que deve ocorrer ao longo da carreira docente e que as lacunas apontadas indicam, em síntese, a necessidade da construção dialética entre teoria e prática.
Needs Analysis on the Improvement of English for Informatics Courses Based on the Perception of Non-English Teachers of State Polytechnic of Malang
Authors: Asri Atiqah Nurul , Ulfa Farida , Suryadi Satrio Binusa 
Published: September 2019

The purpose of the present study was to reveal the needs analysis commissioned by the Information Technology Department regarding the non-English teachersâ€™ perceptions on the teaching and learning practices of the English language in the department. The study employed an online questionnaire and interview to 23 IT teachers. The questionnaire covered the five categories, namely English Language Teaching at IT Department, Language Skills and Components, Teaching Learning Activities, Teaching Skills, IT related topics should be included and Assessments. It used Likert Scale ranging from 1-4 showing disagree to really agree. In addition, the interview utilized a prompt designed beforehand to get the necessary advice to formulate appropriate English language materials for IT students. The results revealed that the teachers needed a more efficient course design and development covering the design of the course syllabus, the creation of activities and materials, and the evaluation of learner progress. They are expected to provide insights as the basis for the improvement both on the teaching preparation and practices
An Observational Study for Grain Dynamics in the AS 209 Disk with Submillimeter Polarization*
Authors: Mori Tomohiro , Kataoka Akimasa , Ohashi Satoshi , Momose Munetake , Muto Takayuki , Nagai Hiroshi , Tsukagoshi Takashi 
Published: September 2019

Abstract
We present an 870 μm Atacama Large Millimeter Array polarization observation toward the Class II protoplanetary disk around AS 209, which has concentric, multiple gaps and rings. We successfully detect the polarized emission and find that the polarization orientations and fractions have distinct characteristics between the inner and outer regions. In the inner region, the polarization orientations are parallel to the minor axis of the disk, which is consistent with the self-scattering model. The mean polarization fraction in the region is ∼0.2%, which is lower than the expected value when the grains have the maximum polarization efficiency, which corresponds to λ/2π ∼ 140 μm in grain radius. In the outer region, we detect ∼1.0% polarization and find that the polarization orientations are almost in the azimuthal directions. Moreover, the polarization orientations have systematic angular deviations from the azimuthal directions with Δθ ∼ 4.°5 ± 1.°6. The pattern is consistent with a model in which radially drifting dust grains are aligned by the gas flow against the dust grains. We consider possible scenarios of the grain dynamics at the AS 209 ring that can reproduce the polarization pattern. However, the directions of the observed angular deviations are opposite to what is predicted based on the fact that the disk rotates clockwise. This raises a question regarding our understanding of the alignment processes and/or grain dynamics in protoplanetary disks.
Numerical Simulations of an Initially Top-hat Jet and the Afterglow of GW170817/GRB170817A
Authors: Gill Ramandeep , Granot Jonathan , Colle Fabio De , Urrutia Gerardo 
Published: September 2019

Abstract
The afterglow of GRB 170817A/GW170817 was very unusual, slowly rising as

, peaking at

days, and sharply decaying as

. Very-long-baseline interferometry observations revealed an unresolved radio afterglow image whose flux centroid apparently moved superluminally with v
app ≈ 4c between 75 and 230 days, clearly indicating that the afterglow was dominated by a relativistic jet’s compact core. Different jet angular structures successfully explained the afterglow light curves: Gaussian and steep power-law profiles with narrow core angles θ

c
≲ 5° and significantly larger viewing angles θ
obs/θ

c
∼ 3−5. However, a top-hat jet (THJ; conical with sharp edges at θ = θ
0) was ruled out because it appeared to produce an early flux rise much steeper (

with a ≳ 3) than observed. Using 2D relativistic hydrodynamic simulations of an initially THJ, we show that the initial steep flux rise is an artifact caused by the simulation’s finite start time, t
0, missing its flux contributions from t < t
0 and sometimes “compensated” using an analytic THJ. While an initially THJ is not very physical, such simulations are particularly useful at

when the afterglow emission is dominated by the jet’s core and becomes insensitive to its exact initial angular profile if it drops off sharply outside of the core. We demonstrate that an initially THJ fits GW170817/GRB 170817A’s afterglow light curves and flux centroid motion at

, for θ
obs/θ
0 ≈ 3 and may also fit the earlier light curves for Γ0 = Γ(t
0) ≳ 102.5. We analytically express the degeneracies between the model parameters, and find a minimal jet energy of

erg and circumburst medium density of

.
WISE Discovery of Mid-infrared Variability in Massive Young Stellar Objects
Authors: Uchiyama Mizuho , Ichikawa Kohei 
Published: September 2019

Abstract
We systematically investigate the mid-infrared (MIR; λ > 3 μm) time variability of uniformly selected ∼800 massive young stellar objects (MYSOs) from the Red Midcourse Space Experiment Source survey. Out of the 806 sources, we obtain reliable 9 yr long MIR magnitude variability data of 331 sources at the 3.4 μm (W1) and 4.6 μm (W2) bands by cross-matching the MYSO positions with ALLWISE and NEOWISE catalogs. After applying the variability selections using ALLWISE data, we identify five MIR-variable candidates. The light curves show various classes, with the periodic, plateau-like, and dipper features. Out of the obtained two color–magnitude diagram of W1 and W1−W2, one shows “bluer when brighter and redder when fainter” trends in variability, suggesting change in extinction or accretion rate. Finally, our results show that G335.9960−00.8532 (hereafter, G335) has a periodic light curve, with an ≈690 day cycle. Spectral energy density model fitting results indicate that G335 is a relatively evolved MYSO; thus, we may be witnessing the very early stages of a hyper- or ultra-compact H ii region, a key source for understanding MYSO evolution.
How Galactic Environment Affects the Dynamical State of Molecular Clouds and Their Star Formation Efficiency
Authors: Schruba Andreas , Kruijssen J. M. Diederik , Leroy Adam K. 
Published: September 2019

Abstract
We investigate how the dynamical state of molecular clouds relates to host galaxy environment and how this impacts the star formation efficiency (SFE) in the Milky Way and seven nearby galaxies. We compile measurements of molecular cloud and host galaxy properties, and determine mass-weighted mean cloud properties for entire galaxies and distinct subregions within. We find molecular clouds to be in ambient pressure-balanced virial equilibrium, where clouds in gas-rich, molecular-dominated, high-pressure regions are close to self-virialization, whereas clouds in gas-poor, atomic-dominated, low-pressure environments achieve a balance between their internal kinetic pressure and external pressure from the ambient medium. The SFE per free-fall time of molecular clouds is low, ∼0.1%–1%, and shows systematic variations of 2 dex as a function of the virial parameter and host galactic environment. The trend observed for clouds in low-pressure environments—as the solar neighborhood—is well matched by state-of-the-art turbulence-regulated models of star formation. However, these models substantially overpredict the low observed SFEs of clouds in high-pressure environments, which suggest the importance of additional physical parameters not yet considered by these models.
HACC Cosmological Simulations: First Data Release
Authors: Heitmann Katrin , Uram Thomas D. , Finkel Hal , Frontiere Nicholas , Habib Salman , Pope Adrian , Rangel Esteban , Hollowed Joseph , Korytov Danila , Larsen Patricia , Allen Benjamin S. , Chard Kyle , Foster Ian 
Published: September 2019

Abstract
We describe the first major public data release from cosmological simulations carried out with Argonne’s HACC code. This initial release covers a range of data sets from large gravity-only simulations. The data products include halo information for multiple redshifts, downsampled particles, and lightcone outputs. We provide data from two very large ΛCDM simulations as well as beyond-ΛCDM simulations spanning 11

cosmologies. Our release platform uses Petrel, a research data service, located at the Argonne Leadership Computing Facility. Petrel offers fast data transfer mechanisms and authentication via Globus, enabling simple and efficient access to stored data sets. Easy browsing of the available data products is provided via a web portal that allows the user to navigate simulation products efficiently. The data hub will be extended by adding more types of data products and by enabling computational capabilities to allow direct interactions with simulation results.
The Hubble Legacy Field GOODS-S Photometric Catalog
Authors: Whitaker Katherine E. , Ashas Mohammad , Illingworth Garth , Magee Daniel , Leja Joel , Oesch Pascal , van Dokkum Pieter , Mowla Lamiya , Bouwens Rychard , Franx Marijn , Holden Bradford , Labbé Ivo , Rafelski Marc , Teplitz Harry , Gonzalez Valentino 
Published: September 2019

Abstract
This manuscript describes the public release of the Hubble Legacy Fields (HLF) project photometric catalog for the extended GOODS-South region from the Hubble Space Telescope (HST) archival program AR-13252. The analysis is based on the version 2.0 HLF data release that now includes all ultraviolet (UV) imaging, combining three major UV surveys. The HLF data combines over a decade worth of 7475 exposures taken in 2635 orbits totaling 6.3 Ms with the HST Advanced Camera for Surveys Wide Field Channel (ACS/WFC) and the Wide Field Camera 3 (WFC3) UVIS/IR Channels in the greater GOODS-S extragalactic field, covering all major observational efforts (e.g., GOODS, GEMS, CANDELS, ERS, UVUDF, and many other programs; see Illingworth et al.). The HLF GOODS-S catalogs include photometry in 13 bandpasses from the UV (WFC3/UVIS F225W, F275W, and F336W filters), optical (ACS/WFC F435W, F606W, F775W, F814W and F850LP filters), to near-infrared (WFC3/IR F098M, F105W, F125W, F140W and F160W filters). Such a data set makes it possible to construct the spectral energy distributions (SEDs) of objects over a wide wavelength range from high-resolution mosaics that are largely contiguous. Here, we describe a photometric analysis of 186,474 objects in the HST imaging at wavelengths 0.2–1.6 μm. We detect objects from an ultra-deep image combining the PSF-homogenized and noise-equalized F850LP, F125W, F140W, and F160W images, including Gaia astrometric corrections. SEDs were determined by carefully taking the effects of the point-spread function in each observation into account. All of the data presented herein are available through the HLF website (https://archive.stsci.edu/prepds/hlf/).
Did GW170817 Harbor a Pulsar?
Authors: Ramirez-Ruiz Enrico , Andrews Jeff J. , Schrøder Sophie L. 
Published: September 2019

Abstract
If the progenitor of GW170817 harbored a pulsar, then a Poynting flux dominated bow-shock cavity would have been expected to form around the traveling binary. The characteristic size of this evacuated region depends strongly on the spin-down evolution of the pulsar companion, which in turn depends on the merging timescale of the system. If this evacuated region is able to grow to a sufficiently large scale, then the deceleration of the jet, and thus the onset of the afterglow, would be noticeably delayed. The first detection of afterglow emission, which was uncovered 9.2 days after the γ-ray burst trigger, can thus be used to constrain the size of a preexisting pulsar-wind cavity. We use this information, together with a model of the jet to place limits on the presence of a pulsar in GW170817 and discuss the derived constraints in the context of the observed double neutron star binary population. We find that the majority of Galactic systems that are close enough to merge within a Hubble time would have carved a discernibly large pulsar-wind cavity, inconsistent with the onset timescale of the X-ray afterglow of GW170817. Conversely, the recently detected system J1913+1102, which hosts a low-luminosity pulsar, provides a congruous Milky Way analog of GW170817's progenitor model. This study highlights the potential of the proposed observational test for gaining insight into the origin of double neutron star binaries, in particular if the properties of Galactic systems are representative of the overall merging population.
Les classes populaires sont-elles (les plus) populistes ? Attitudes populistes et vote radical lors de l’élection présidentielle de 2017
Authors: Alexandre Chloé , Gonthier Frédéric , Guerra Tristan 
Published: September 2019

Cet article examine les classes populaires en France sous l’angle des attitudes populistes et du vote pour les partis radicaux auxquels elles sont couramment associées. Il propose une opérationnalisation originale des milieux populaires par la technique statistique de l’analyse en classes latentes (ACL). Avec une enquête post-électorale incluant des mesures fines de précarité, on isole trois fractions distinctes : le précariat, les classes populaires retraitées et les travailleurs pauvres. On met en évidence que si les catégories populaires sont très homogènes dans leurs attitudes populistes, elles diffèrent plus fortement les unes des autres dans leurs comportements électoraux. Ce faisant, on souligne l’importance d’une lecture multidimensionnelle des classes populaires pour la compréhension de leur rapport au politique.
Le paysage du Grand Tour , du pittoresque au sublime
Authors: Commetti Henri 
Published: September 2019

Le Grand Tour qui fixera pour toute l’aristocratie britannique l’idéal de l’homme de culture ouvre le regard sur la géographie du monde. L’analyse de l’éducation esthétique dont il est le support révèle bien autre chose : non la découverte d’une extériorité, mais l’entretien d’une vie de l’imagination nourrie des images intérieures de l’esprit. Le « paysage » du Grand Tour fournit ainsi une nouvelle occasion de revenir sur les incertitudes qui en entourent la notion, là-même où il paraîtrait frappé d’évidence.
La transgression paysagère
Authors: Balibar Justine 
Published: September 2019

L’esthétique occidentale du paysage est construite sur le fond d’une dualité entre le réel et la représentation : d’un côté le paysage que nous parcourons avec nos yeux et notre corps dans l’espace physique, d’un autre côté le paysage représenté dans des images de tout type. Cette dualité est traditionnellement interprétée selon un rapport hiérarchique : le paysage représenté constituerait l’origine et le modèle de l’expérience des paysages réels. Mais il existe d’autres façons de comprendre cette dualité : l’une des formes possibles de l’expérience paysagère consiste en effet à passer du paysage réel au paysage représenté et vice versa , ce passage soulevant le problème de la différence ontologique entre le monde réel et le monde de la représentation et pouvant être à ce titre défini comme une transgression.
Railway Ballast Fouling Detection Using GPR Data: Introducing a Combined Time–Frequency and Discrete Wavelet Techniques
Authors: Al‐Qadi Imad L. , Zhao Shan , Shangguan Pengcheng 
Published: September 2019

ABSTRACTGround‐penetrating radar has been recently used for quantifying railway ballast fouling conditions. This paper discusses two approaches for processing the railway ballast ground‐penetrating radar signal: the discrete wavelet transform method and the short‐time Fourier transform method. Ground‐penetrating radar field data collected in Wyoming in 2007 by two 2‐GHz air‐coupled antennas were used to verify both approaches. The collected ground‐penetrating radar signals were processed by discrete wavelet transform. The signal standard deviation values were fitted by linear regression of the fouling indices, which were calculated using ground‐truth sieving data. The spectrogram generated by short‐time Fourier transform was used to analyse the ballast fouling condition level by comparing the energy attenuation speed. It was observed that both discrete wavelet transform and short‐time Fourier transform approaches can be used to analyse ballast fouling conditions. The short‐time Fourier transform method is easier to visualize, whereas the discrete wavelet transform approach can more quantitatively predict the fouling level. However, the discrete wavelet transform method provides the fouling condition of the whole ballast layer, whereas the spectrogram provides the fouling condition with respect to the depth profile.
Step‐frequency ground‐penetrating‐radar array calibration requirements to estimate dielectric properties of pavements
Authors: Gagarin Nicolas , Mekemson James 
Published: September 2019

ABSTRACTDuring the past decade, ground penetrating radar has emerged as a viable non‐destructive testing technology for quality control and quality assurance during pavement construction and for the infrastructure subsurface condition assessment. Data are collected with the ground penetrating radar antenna array attached to a vehicle travelling along the road. With ground penetrating radar data, there is a corresponding need to follow strict protocols both in data collection and data processing, especially for antenna arrays. The key to successful data measurements is the application of calibra‐tion procedures appropriate to the hardware system, measurement protocols, and desired measurement statistic or parameter. This paper presents four primary calibration procedures required for ground penetrating radar antenna arrays with actual case application using an air‐coupled step‐frequency ground penetrating radar array. These calibration procedures for a step‐frequency ground penetrating radar antenna array are applied to produce the ground penetrating radar signal foundation for estimating the dielectric properties of materials in a layered highway pavement structure. In addition, a complete solution space is required to identify all layer interfaces and buried objects.
Multiwave Gaussian beam prestack depth migration of exploration‐scale seismic data with complex near‐surface effects
Authors: Han Jianguang , Wang Yun , Yu Changqing 
Published: September 2019

ABSTRACTThe direct prestack depth migration methods of nonplanar data provide effective ways to address the complex near‐surface problem. Based on the study of local slant stacks considering the elevation and dip angle information of an irregular surface, an alternative method for multiwave Gaussian beam prestack depth migration of exploration‐scale seismic data with complex near‐surface effects is presented here. We first derive the downward‐continued wavefield for an irregular surface in terms of Gaussian beams, where we directly decompose the seismic records within a Gaussian window into a local plane‐wave component. The PP‐ and PS‐wave Gaussian beam prestack depth migration methods under complex near‐surface conditions are then presented, after the wavefield separation is performed with an affine coordinate‐system transform. Tests with numerical examples demonstrate the accuracy and effectiveness of the method.
Comparison between thermal airborne remote sensing, multi‐depth electrical resistivity profiling, and soil mapping: an example from Beauce (Loiret, France)
Authors: Pasquier Catherine , Bourennane Hocine , Cousin Isabelle , Séger Maud , Dabas Michel , Thiesson Julien , Tabbagh Julien 
Published: September 2019

ABSTRACTA wide variety of remote sensing and ground‐based (proximal sensing) methods have been developed to describe soil physical properties and their lateral variations. Remote sensing enables the estimation of soil properties over large areas, but the information is often limited to the soil surface. Ground‐based methods enable the derivation of soil properties for the whole soil column thickness, although these methods cannot be conducted over large areas. The aim of the present study is to contribute to the assessment of the efficacy of airborne thermal prospection over bare soils in soil mapping. This study focuses on a comparison between this technique, which can investigate over the whole soil column thickness after a sufficiently long transient heat exchange period, and pedo‐logical and electrical resistivity data that were recorded for three different depths of investigation.The study area is located in the Beauce region, where the soils (haplic Calcisol or calcaric Cambisol) consist of a loamy–clay layer that is 0.3 m–1.4 m thick and overlies Tertiary Beauce limestone. Thermal measurements were recorded by ARIES radiometer in December, after six days of heat loss from the ground. The investigation depth could thus be considered to be larger than the thickness of the ploughed layer. Comparisons using statistical analyses between the thermal measurements, electrical resistivity, and pedological data demonstrated that: (i) the spatial organization of the thermal inertia map is similar to the spatial organization of the 0‐m to 1.7‐m resistivity map; and (ii) the thermal apparent inertia values are significantly different between the haplic Calcisols and the calcaric Cambisols and can thus be mapped with a high spatial resolution over large areas. The applicability of thermal prospecting in soil mapping opens up many possibilities considering the present advances in light‐infrared radiometers. Beside agronomical concerns, this methodology will also facilitate progress in engineering applications, including the cross‐estimation of electrical and thermal properties.