bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chromospheric Peculiar Off-limb Dynamical Events from IRIS Observations
Authors: Tavabi E. , Koutchmy S. 
Published: September 2019

Abstract
To study motions and oscillations in the solar chromosphere and at the transition region level we analyze some extreme Doppler shifts observed off-limb with the Interface Region Imaging Spectrograph (IRIS). Raster scans and slit-jaw imaging observations performed in the near-ultraviolet channels were used. Large transverse oscillations are revealed by the far wings profiles after accurately removing the bulk average line profiles of each sequence. Different regions around the Sun are considered. Accordingly, the cool material of spicules is observed in Mg ii lines rather dispersed up to coronal heights. In the quiet Sun and especially in a polar coronal hole, we study dynamical properties of the dispersed spicules-material off-limb using high spectral, temporal, and spatial resolutions IRIS observations. We suggest that numerous small-scale jet-like spicules show rapid twisting and swaying motions evidenced by the large distortion and dispersion of the line profiles, including impressive periodic Doppler shifts. Most of these events repeatedly appear in red and blueshifts above the limb throughout the whole interval of the observation data sets, with an average swaying speed of order ±35 km s−1 reaching a maximum value of 50 km s−1 in the polar coronal hole region, well above the 2.2 Mm heights. We identified for the first time waves with a short period of order of 100 s, and less and transverse amplitudes of order of ±20–30 km s−1 with the definite signature of Alfvén waves. No correlation exists between brightness and Doppler shift variations; the phase speed of the wave is very large and cannot definitely be determined from the spectral features seen along the quasi-radial features. Even shorter periods waves are evidenced, although their contrast is greatly attenuated by the overlapping effects along the line of sight.
High-resolution Near-infrared Spectroscopy of HD 100546. IV. Orbiting Companion Disappears on Schedule
Authors: Brittain Sean D. , Najita Joan R. , Carr John S. 
Published: September 2019

Abstract
HD 100546 is a Herbig Ae/Be star surrounded by a disk with a large central region that is cleared of gas and dust (i.e., an inner hole). High-resolution near-infrared spectroscopy reveals a rich emission spectrum of fundamental rovibrational CO emission lines whose time variable properties point to the presence of an orbiting companion within the hole. The Doppler shift and spectroastrometric signal of the CO v = 1−0 P26 line, observed from 2003 to 2013, are consistent with a source of excess CO emission that orbits the star near the inner rim of the disk. The properties of the excess emission are consistent with those of a circumplanetary disk. In this paper, we report follow-up observations that confirm our earlier prediction that the orbiting source of excess emission would disappear behind the near side of the inner rim of the outer disk in 2017. We find that while the hot band CO lines remained unchanged in 2017, the v = 1−0 P26 line and its spectroastrometric signal returned to the profile observed in 2003. With these new observations, we further constrain the origin of the emission and discuss possible ways of confirming the presence of an orbiting planetary companion in the inner disk.
The Pseudo-evolution of Galaxy-cluster Masses and Its Connection to Mass Density Profile
Authors: Shirasaki Masato 
Published: September 2019

Abstract
A mass of dark matter halo is commonly defined as the spherical overdensity (SO) mass with respect to a reference density, whereas the time evolution of an SO mass can be affected by the redshift evolution of the reference density as well as the physical mass accretion around halos. In this study, we directly measure the amount of pseudo evolution of the SO masses of cluster-sized halos by the changes in the reference density from a time series of N-body simulations for the first time. We find that the 52% ± 19% difference in the virial SO masses between z = 0 and 1 can be accounted for by the pseudo evolution of clusters with a virial mass of 1014
h
−1
M
⊙ at z = 0. The amount of pseudo evolution is found to be correlated with the age and density environment of a galaxy cluster. The stacked mass density profiles of cluster-sized halos with a greater amount of pseudo evolution in the SO mass shows the higher concentration and greater linear bias parameter that is a counterexample of the known secondary halo bias due to concentration on the scale of clusters. We discuss how more concentrated clusters can show larger clustering amplitudes than their less concentrated counterparts and argue that the presence of rich filamentary structures plays a critical role in determining the linear halo bias of galaxy clusters.
Correlations between the Variation of the Ionizing Continuum and Broad Absorption Lines in Individual Quasars
Authors: Lu 陆 Wei-Jian 伟坚 , Lin 林 Ying-Ru 樱如 
Published: September 2019

Abstract
We discover the significant (significance level of >99%) correlations between the fractional variation of the ionizing continuum and that of the C iv and/or Si iv broad absorption lines (BALs) in each of 21 BAL quasars that have at least five-epoch observations from the Sloan Digital Sky Survey-I/II/III. This result reveals that the fluctuation of the ionizing continuum is the driver of most of these BAL variations. Among them, 17 show negative correlations and the other 4 positive correlations, which agrees with the prediction of photoionization models that absorption line variability response to ionization changes is not monotonic. Eight quasars out of 21 examples have been observed at least 30 times on rest-frame timescales as short as a few days, which reveals that changes in the incident ionizing continuum can cause BAL variability even in such a short period of time. In addition, we find that most of the 21 quasars show larger variation amplitude in Si iv than C iv, which reveals the ubiquity of saturation in these BALs (at least for C iv BALs).
Metal Abundances and Star Formation Rates of Emission-line Galaxies in and around the Boötes Void
Authors: Wegner Gary A. , Salzer John J. , Taylor Joanna M. , Hirschauer Alec S. 
Published: September 2019

Abstract
We explore the possible dependencies of galaxy metal abundance and star formation rate (SFR) on local environment, focusing on the volume of space in and around the Boötes Void. Our sample of star-forming galaxies comes from the second catalog of the Hα-selected KPNO International Spectroscopic Survey (KISS), which overlaps the void. This sample represents a statistically complete, line-flux-limited ensemble of 820 star-forming galaxies, all of which possess metallicity and SFR estimates. We carry out two distinct analyses of the KISS galaxies: one that probes the properties of the entire sample as a function of local density, and a second that details the properties of 33 KISS star-forming galaxies located within the Boötes Void. In both cases, we find no evidence that either the metallicity of the KISS galaxies or their SFRs depend on the environments within which the galaxies are located. Our global analysis does show weak trends for decreasing stellar mass, decreasing metallicity, and decreasing SFRs with decreasing local densities. However, we argue that the metallicity and SFR trends are artifacts of the stellar mass—local density trend. In particular, the change in metallicity with density is precisely what one would predict from the mass–metallicity relation, given the observed drop in stellar mass with decreasing metallicity. Likewise, the SFR trend with density disappears when one instead considers the mass-normalized specific SFR. The KISS galaxies dwelling in the Boötes Void are found to have metallicity and SFR properties nearly identical to those of a matched comparison sample, despite the fact that the former are located in density environments that are, on average, more than 16 times lower.
The Frequency-dependent Behavior of Subpulse Drifting. I. Carousel Geometry and Emission Heights of PSR B0031–07
Authors: McSweeney S. J. , Bhat N. D. R. , Wright G. , Tremblay S. E. , Kudale S. 
Published: September 2019

Abstract
The carousel model of pulsar emission attributes the phenomenon of subpulse drifting to a set of discrete sparks located very near the stellar surface rotating around the magnetic axis. Here, we investigate the subpulse drifting behavior of PSR B0031−07 in the context of the carousel model. We show that B0031−07's three drift modes (A, B, and C) can be understood in terms of a single carousel rotation rate if the number of sparks is allowed to change by an integral number, and where the different drift rates are due to (first-order) aliasing effects. This also results in harmonically related values for P
3 (the time it takes a subpulse to reappear at the same pulse phase), which we confirm for B0031−07. A representative solution has [n
A, n
B, n
C] = [15, 14, 13] sparks and a carousel rotation period of P
4 = 16.4 P
1. We also investigate the frequency dependence of B0031−07's subpulse behavior. We extend the carousel model to include the dual effects of aberration and retardation, including the time it takes the information about the surface spark configuration to travel from the surface up to the emission point. Assuming these effects dominate at B0031−07's emission heights, we derive conservative emission height differences of ≲2000 km for mode A and ≲1000 km for modes B and C as seen between 185 and 610 MHz. This new method of measuring emission heights is independent of others that involve average profile components or the polarization position angle curve, and thus provides a potentially strong test of the carousel model.
The Role of Magnetic Helicity in Coronal Heating
Authors: Knizhnik K. J. , Antiochos S. K. , Klimchuk J. A. , DeVore C. R. 
Published: September 2019

Abstract
One of the greatest challenges in solar physics is understanding the heating of the Sun’s corona. Most theories for coronal heating postulate that free energy in the form of magnetic twist/stress is injected by the photosphere into the corona where the free energy is converted into heat either through reconnection or wave dissipation. The magnetic helicity associated with the twist/stress, however, is expected to be conserved and appear in the corona. In previous works, we showed that the helicity associated with the small-scale twists undergoes an inverse cascade via stochastic reconnection in the corona and ends up as the observed large-scale shear of filament channels. Our “helicity condensation” model accounts for both the formation of filament channels and the observed smooth, laminar structure of coronal loops. In this paper, we demonstrate, using helicity- and energy-conserving numerical simulations of a coronal system driven by photospheric motions, that the model also provides a natural mechanism for heating the corona. We show that the heat generated by the reconnection responsible for the helicity condensation process is sufficient to account for the observed coronal heating. We study the role that helicity injection plays in determining coronal heating and find that, crucially, the heating rate is only weakly dependent on the net helicity preference of the photospheric driving. Our calculations demonstrate that motions with 100% helicity preference are least efficient at heating the corona; those with 0% preference are most efficient. We discuss the physical origins of this result and its implications for the observed corona.
Double Neutron Star Mergers from Hierarchical Triple-star Systems
Authors: Hamers Adrian S. , Thompson Todd A. 
Published: September 2019

Abstract
The isolated binary evolution model for merging neutron stars (NSs) involves processes such as mass transfer, common-envelope evolution, and natal kicks, all of which are poorly understood. Also, the predicted NS–NS merger rates are typically lower than the rates inferred from the LIGO GW170817 event. Here, we investigate merger rates of NS and black hole–NS binaries in hierarchical triple-star systems. In such systems, the tertiary can induce Lidov–Kozai (LK) oscillations in the inner binary, accelerating its coalescence and potentially enhancing compact object merger rates. However, because compact objects originate from massive stars, the prior evolution should also be taken into account. Natal kicks, in particular, could significantly reduce the rates by unbinding the tertiary before it can affect the inner binary through LK evolution. We carry out simulations of massive triples, taking into account stellar evolution starting from the main sequence, secular and tidal evolution, and the effects of supernovae. For large NS birth kicks (

), we find that the triple NS–NS merger rate (several hundred

) is lower by a factor of ∼2–3 than the binary rate, but for no kicks (

), the triple rate (several thousand

) is comparable to the binary rate. Our results indicate that a significant fraction of NS–NS mergers could originate from triples if a substantial portion of the NS population is born with low kick velocities, as indicated by other work. However, uncertainties and open questions remain because of our simplifying assumption of dynamical decoupling after inner binary interaction has been triggered.
Honneur à l’ambivalence
Authors: Mazzetti Marco , Évrard Brigitte 
Published: September 2019

À l’aide d’un cas clinique, l’auteur décrit l’expérience phénoménologique de l’ambivalence dans le contexte thérapeutique et discute de son traitement en cinq étapes : (1) reconnaître et légitimer l’ambivalence ; (2) distinguer l’incertitude de la confusion ; (3) accepter l’ambivalence, s’abstenir de la résoudre immédiatement ; (4) analyser avec respect les deux pôles de l’ambivalence ; et (5) reconnaître leur unité fondamentale car les deux pôles constituent généralement les deux faces d’un même désir de bien-être. L’étude de cas montre comment traiter non seulement l’ambivalence du patient, mais aussi celle du thérapeute. Le modèle d’intervention décrit montre son utilité pour comprendre à la fois la dynamique de transfert et la dynamique de contre-transfert de la dyade thérapeutique. L’auteur envisage les précautions nécessaires pour mener à bien le processus analytique ainsi que l’utilité de la neutralité empathique à l’égard des deux pôles de l’ambivalence.
De quoi l’inclusion est-elle le nom ?
Authors: Puaud David 
Published: September 2019

Cet article vise à interroger de quoi l’inclusion est le nom. Le terme inséré est devenu ces dernières années une catégorie à part entière caractérisée par la figure de l’individu « insérés ». Cette catégorie mobilise de nombreuses notions et concepts sous-jacents tels que l’ empowerment , l’autonomie, la conditionnalité comportementale. Il s’agit ici de définir ce que sous-tend le terme d’inclusion sociale puis d’étudier comment le processus d’insertion favorise l’uniformisation sociale et politique d’une population tout juste contrariée par quelques situations marginales contrôlées par l’agencement de la main droite et de la main gauche de l’État.
Les modalités d’inclusion scolaire et professionnelle des jeunes sortant des Instituts Thérapeutiques Éducatifs et Pédagogiques
Authors: Cervera Mélaine , Parron Audrey 
Published: September 2019

Cet article présente des modalités d’inclusion vers le milieu ordinaire de jeunes sortant d’un accompagnement en Institut Thérapeutique Éducatif et Pédagogique (ITEP ou DITEP). Dans un contexte qui tend à favoriser les passerelles entre l’institution spécialisée et les structures de l’Éducation nationale, nous rendons compte, en premier lieu, à travers des résultats issus d’une enquête quantitative et qualitative, de trajectoires scolaires entre les dispositifs spécialisés et le milieu ordinaire. Aux termes de nos analyses, nous proposons, en second lieu, une discussion autour du recours à l’enseignement adapté pour permettre une inclusion scolaire à la sortie du (D)ITEP et autour de la rupture « de fait » avec les dispositifs de compensation du handicap dédiés aux adultes à la sortie de la filière infanto-juvénile.
L’accueil, un territoire inclusif. L’exemple de la parentalité
Authors: Rougerie Corinne , Micor Marjorie 
Published: September 2019

Nous proposons d’interroger la fonction inclusive de l’accueil dans le champ du travail social en l’illustrant d’une pratique issue du secteur du soutien à la parentalité. L’accueil nous paraît être un analyseur de l’évolution des liens relationnels entre le public et les professionnels de la relation (Rougerie, 2015). L’évolution de la prise en compte des problèmes sociétaux s’inscrit de plus en plus dans le territoire de vie des personnes, en s’appuyant sur une pluralité d’acteurs. Mais la fonction d’accueil favorise-t-elle vraiment un accompagnement inclusif des personnes ? En croisant nos regards en sciences de l’éducation et en sociologie, nous interrogeons l’accueil comme territoire de rencontre, au-delà de sa matérialité. Le contexte de l’accueil des familles pour un soutien à la parentalité proposé par L’École des Parents et des Éducateurs de Moselle (EPE) vient illustrer la matérialité d’un accueil inconditionnel.
Discours à la frontière : processus d’inclusion-exclusion liés au phénomène de la prostitution
Authors: Carbó Pilar Albertín , Langarita Adiego Jose Antonio 
Published: September 2019

Le discours sur le phénomène de la prostitution a fait son apparition sur le territoire transfrontalier situé entre la Catalogne (Espagne) et les Pyrénées-Orientales (France). La frontière est un lieu perméable dans lequel les processus d’inclusion-exclusion font partie d’un continuum. L’objectif de ce travail est de détecter ces processus qui ont été relevés dans les discours au sein de la population, en particulier ceux axés sur le développement du travail sexuel et les femmes qui l’exercent. Nous avons réalisé des observations sur le terrain (dans la rue et dans les clubs) et interviewé des professionnels en lien avec les femmes exerçant un travail sexuel. Par la suite, nous avons identifié trois dimensions discursives dans lesquelles situer les processus d’inclusion-exclusion : les différents espaces et territoires du travail sexuel, la construction d’une catégorie de femmes dédiées au travail sexuel et les caractéristiques et considérations concernant le travail sexuel pour les femmes.
Civilisation vs Barbarie , métaphore raciste d’un appel à la guerre identitaire ?
Authors: Dhume Fabrice 
Published: September 2019

Cet article interroge les liens entre les discours sur le thème Barbarie vs Civilisation et le racisme. Prenant appui sur les discours (d’élites, le plus souvent) circulant de la presse quotidienne nationale, il met en évidence de façon synchronique le portrait-type du « Barbare » et ses présupposés racistes, ainsi que les principales figures auxquelles ce discours est appliqué. Dans une perspective diachronique, il montre les reformulations récentes de ce discours comme un appel à la guerre « de civilisation », en particulier face à l’immigration et l’islam.
Révolutions arabes : que pouvons-nous espérer ?
Authors: Achcar Gilbert , Taïbi Nadia 
Published: September 2019

Dans cet entretien, on montrera que les conditions qui ont vu naître les révolutions arabes n’ont pas changé : chômage, inégalité sociale, cherté de la vie. Et que la grande question pour cette partie du monde, mais aussi pour le monde entier, est celle de l’émergence de directions progressistes à la hauteur des enjeux…
La critique de la modernité technique : termes et variations
Authors: Moatti Alexandre 
Published: September 2019

L’histoire de la critique de la modernité technique s’adjoint utilement celle du vocabulaire critique. Elle amène en particulier à rencontrer certains néologismes ou mots fort peu usités. Disons alors que repérer ces néologismes, ces expressions-choc est une des méthodes de travail et d’analyse du chercheur en la matière. Comme l’est l’histoire des mots plus courants (ceux qui ne sont pas des néologismes à usage rhétorique), qui est au cœur de l’histoire des idées – leur apparition, leur période de « mode », leur déclin. Par exemple : quand apparaît le mot transhumanisme ?
De la fragilité des êtres et la persistance des grands espaces : que peut la photographie ?
Authors: Van Malleghem Sébastien , Taïbi Nadia 
Published: September 2019

Le problème de la photographie est un problème de distance. Quand on regarde les photographies en Europe on a tendance à être un peu loin deux trois mètres de nos sujets au contraire des grands photographes américains comme Eugene Richards qui ont tendance à être prés parfois à 50 cm de ce qu’ils photographient. Or, quand le photographe est proche des gens : il tremble et se présente avec son humanité et cela fait peut-être apparaître l’humanité.
Bernard Plossu et le désert d’Almería
Authors: Terrasa Jacques 
Published: September 2019

À partir de 1987 et durant une quinzaine d’années, Bernard Plossu a parcouru à pied les étendues désertiques de la région d’Almería, dans le sud de l’Espagne. La rencontre avec ce nouveau « jardin de poussière » prolonge celle du désert américain et celle du Sahara, qu’il a découvert avec son père à l’âge de treize ans. Les images que le voyageur rapporte de cet « ailleurs » andalou, espace vide et primordial situé aux portes de l’Europe, montrent que la photographie est aussi la trace d’une expérience – celle du vide, de la solitude, de la confrontation avec les rythmes extrêmes de la nature…
The Fund’s Lending Framework and Sovereign Debt - Preliminary Considerations
Authors:   International Monetary Fund
Published: September 2019

As a follow-up to the Executive Board's May 2013 discussion, this paper considers a possible direction for reform of the Fund's lending framework in the context of sovereign debt vulnerabilities. The primary focus of this paper relates to the Fund's exceptional access framework, since it is in this context that the Fund will most likely have to make the difficult judgment as to whether the member's problems can be resolved with or without a debt restructuring. The objective of the preliminary approaches set forth in this paper is to reduce the costs of crisis resolution for both creditors and debtors—relative to the alternatives—thereby benefitting the overall system. These ideas are market-based and their eventual implementation would require meaningful consultation with creditors.
Is Simpler Always Better? Effects of Perceptual Detail and Viewpoint on Spatial Cognition and Metacognition
Authors: Stevens Christopher A. , Carlson Richard A. 
Published: September 2019

Abstract
When making spatial judgments, people tend to prefer to use artifacts and displays with a high level of perceptual detail or realism. Sometimes, increasing detail is helpful. But sometimes it leads to an information overload that degrades performance. Very little prior research has examined the effect of perceptual detail on orientation judgments. Such judgments require a person to flexibly adopt various novel viewpoints within a space. We hypothesized that perceptual details would help people construct flexible representations of a novel space and that people would be more confident when perceptual information was available at study. Sixty participants memorized a map of a novel location, made judgments of relative direction, and gave confidence estimates about those judgments; one group studied a high-detail satellite map and the other studied a low-detail schematic map. People who studied the high-detail map were more confident and accurate in their later judgments about the map. Overall, the study suggests that perceptually vivid maps may improve performance and confidence in spatial judgments about a newly learned space.