bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Differential Rotation on the Magnetic Braking of Low-mass and Solar-like Stars: A Proof-of-concept Study
Authors: Ireland Lewis G. , Matt Sean P. , Davey Charlie R. , Harris Owain L. , Slade-Harajda Tobias W. , Finley Adam J. , Zanni Claudio 
Published: January 2022

Abstract
On the main sequence, low-mass and solar-like stars are observed to spin down over time, and magnetized stellar winds are thought to be predominantly responsible for this significant angular momentum loss. Previous studies have demonstrated that the wind torque can be predicted via formulations dependent on stellar properties, such as magnetic field strength and geometry, stellar radius and mass, wind mass-loss rate, and stellar rotation rate. Although these stars are observed to experience surface differential rotation, torque formulations so far have assumed solid-body rotation. Surface differential rotation is expected to affect the rotation of the wind and thus the angular momentum loss. To investigate how differential rotation affects the torque, we use the PLUTO code to perform 2.5D magnetohydrodynamic, axisymmetric simulations of stellar winds, using a colatitude-dependent surface differential rotation profile that is solar-like (i.e., rotation is slower at the poles than the equator). We demonstrate that the torque is determined by the average rotation rate in the wind so that the net torque is less than that predicted by assuming solid-body rotation at the equatorial rate. The magnitude of the effect is essentially proportional to the magnitude of the surface differential rotation, for example, resulting in a torque for the Sun that is ∼20% smaller than predicted by the solid-body assumption. We derive and fit a semianalytic formulation that predicts the torque as a function of the equatorial spin rate, magnitude of differential rotation, and wind magnetization (depending on the dipolar magnetic field strength and mass-loss rate, combined).
Eccentric Gap Induced by a Super-Jupiter-mass Planet
Authors: Tanaka Yuki A. , Kanagawa Kazuhiro D. , Tanaka Hidekazu , Tanigawa Takayuki 
Published: January 2022

Abstract
A giant planet embedded in a protoplanetary disk opens a gap by tidal interaction, and properties of the gap strongly depend on the planetary mass and disk parameters. Many numerical simulations of this process have been conducted, but detailed simulations and analysis of gap formation by a super-Jupiter-mass planet have not been thoroughly conducted. We performed two-dimensional numerical hydrodynamic simulations of the gap formation process by a super-Jupiter-mass planet and examined the eccentricity of the gap. When the planet is massive, the radial motion of gas is excited, causing the eccentricity of the gap’s outer edge to increase. Our simulations showed that the critical planetary mass for the eccentric gap was ∼ 3 M
J in a disk with α = 4.0 × 10−3 and h/r = 0.05, a finding that was consistent with that reported in a previous work. The critical planetary mass for the eccentric gap depends on the viscosity and the disk scale height. We found that the critical mass could be described by considering a dimensionless parameter related to the gap depth. The onset of gap eccentricity enhanced the surface density inside the gap, shallowing the gap more than the empirical relation derived in previous studies for a planet heavier than the critical mass. Therefore, our results suggest that the mass accretion rate, which strongly depends on the gas surface density in the gap, is also enhanced for super-Jupiter-mass planets. These results may substantially impact the formation and evolution processes of super-Jupiter-mass planets and population synthesis calculations.
Electron Preacceleration at Weak Quasi-perpendicular Intracluster Shocks: Effects of Preexisting Nonthermal Electrons
Authors: Ha Ji-Hoon , Ryu Dongsu , Kang Hyesung , Kim Sunjung 
Published: January 2022

Abstract
Radio relics in the outskirts of galaxy clusters imply the diffusive shock acceleration (DSA) of electrons at merger-driven shocks with Mach number M

s
≲ 3–4 in the intracluster medium (ICM). Recent studies have suggested that electron preacceleration and injection, prerequisite steps for DSA, could occur at supercritical shocks with M

s
≳ 2.3 in the ICM, thanks to the generation of multiscale waves by microinstabilities such as the Alfvén ion cyclotron (AIC) instability, the electron firehose instability (EFI), and the whistler instability (WI). On the other hand, some relics are observed to have subcritical shocks with M

s
≲ 2.3, leaving DSA at such weak shocks as an outstanding problem. Reacceleration of preexisting nonthermal electrons has been contemplated as one of possible solutions for that puzzle. To explore this idea, we perform particle-in-cell simulations for weak quasi-perpendicular shocks in high-β (β = P
gas/P

B
) plasmas with power-law suprathermal electrons in addition to Maxwellian thermal electrons. We find that suprathermal electrons enhance the excitation of electron-scale waves via the EFI and WI. However, they do not affect the ion reflection and the ensuing generation of ion-scale waves via the AIC instability. The presence of ion-scale waves is the key for the preacceleration of electrons up to the injection momentum; thus, the shock criticality condition for electron injection to DSA is preserved. Based on the results, we conclude that preexisting nonthermal electrons in the preshock region alone would not resolve the issue of electron preacceleration at subcritical ICM shocks.
Changing-look Event in NGC 3516: Continuum or Obscuration Variability?
Authors: Mehdipour Missagh , Kriss Gerard A. , Brenneman Laura W. , Costantini Elisa , Kaastra Jelle S. , Branduardi-Raymont Graziella , Di Gesu Laura , Ebrero Jacobo , Mao Junjie 
Published: January 2022

Abstract
The Seyfert-1 galaxy NGC 3516 has undergone major spectral changes in recent years. In 2017 we obtained Chandra, NuSTAR, and Swift observations during its new low-flux state. Using these observations, we model the spectral energy distribution (SED) and the intrinsic X-ray absorption, and compare the results with those from historical observations taken in 2006. We thereby investigate the effects of the changing-look phenomenon on the accretion-powered radiation and the ionized outflows. Compared to its normal high-flux state in 2006, the intrinsic bolometric luminosity of NGC 3516 was lower by a factor of 4–8 during 2017. Our SED modeling shows a significant decline in the luminosity of all the continuum components from the accretion disk and the X-ray source. As a consequence, the reprocessed X-ray emission lines have also become fainter. The Swift monitoring of NGC 3516 shows remarkable X-ray spectral variability on short (weeks) and long (years) timescales. We investigate whether this variability is driven by obscuration or the intrinsic continuum. We find that the new low-flux spectrum of NGC 3516, and its variability, do not require any new or variable obscuration, and instead can be explained by changes in the ionizing SED that result in the lowering of the ionization of the warm-absorber outflows. This in turn induces enhanced X-ray absorption by the warm-absorber outflows, mimicking the presence of new obscuring gas. Using the response of the ionized regions to the SED changes, we place constraints on their densities and locations.
The Disk Veiling Effect of the Black Hole Low-mass X-Ray Binary A0620-00*
Authors: Zheng Wan-Min , Wu Qiaoya , Wu Jianfeng , Wang Song , Sun Mouyuan , Guo Jing , Liu Junhui , Yi Tuan , Zhang Zhi-Xiang , Gu Wei-Min , Wang Junfeng , Gou Lijun , Liu Jifeng , Callanan Paul J. , Ho Luis C. , Longa-Peña Penélope , Orosz Jerome A. , Reynolds Mark T. 
Published: January 2022

Abstract
The optical light curves of quiescent black hole low-mass X-ray binaries often exhibit significant nonellipsoidal variabilities, showing the photospheric radiation of the companion star is veiled by other sources of optical emission. Assessing this “veiling” effect is critical to the black hole mass measurement. Here in this work, we carry out a strictly simultaneous spectroscopic and photometric campaign on the prototype of black hole low-mass X-ray binary A0620-00. We find that for each observation epoch, the extra optical flux beyond a pure ellipsoidal modulation is positively correlated with the fraction of veiling emission, indicating the accretion disk contributes most of the nonellipsoidal variations. Meanwhile, we also obtain a K2V spectral classification of the companion, as well as the measurements of the companion’s rotational velocity

v
sin
i
=
83.8
±
1.9

km s−1 and the mass ratio between the companion and the black hole q = 0.063 ± 0.004.
A systematic literature review of the representations of migration in Brazil and the United Kingdom
Authors: Gonçalves Isabella , David Yossi 
Published: January 2022

In recent decades, increased scholarly attention has been paid to the interactions between immigration, media coverage, framing, and the rise of populism. This paper draws on these interactions to systematically review peer-reviewed articles related to media representations of immigrants and refugees in Brazil and the United Kingdom (UK). The objective was to identify the tone used in such representations and the research methods applied in the articles. This is the first systematic literature review that compares studies on media and immigration including both Western, Educated, Industrialized, Rich, and Democratic (WEIRD) and non-WEIRD countries. This paper uses Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) to collect, map, and systematize 47 peer-reviewed articles published in the past two decades. The findings show that, in the studies we analyzed, the tone of representation of refugees in the media in both countries is negative. Mass media underrepresent the main actors and use stereotypes and discourses of otherization. This paper contributes to our understanding of the differences between studies, including those conducted in the UK and Brazil, and calls for more comparative studies that include countries from the global south and global north. It also demonstrates the standardization of frames and tone of representation on immigration in both countries, suggesting similar patterns across different countries.
En las últimas décadas, se ha prestado una mayor atención académica a las interacciones entre la inmigración, la cobertura de los medios de comunicación, los tipos de encuadres y el aumento del populismo. Este trabajo revisa sistemáticamente un grupo de artículos revisados por pares cuya temática son las representaciones mediáticas de los inmigrantes y los refugiados en Brasil y el Reino Unido con el fin de identificar el tono de dichas representaciones y los métodos de investigación utilizados. Esta es la primera revisión bibliográfica sistemática que compara estudios sobre los medios de comunicación y la inmigración que incluye una muestra de países del sur y del norte global. Este trabajo utiliza las directrices de PRISMA para recopilar, mapear y sistematizar 47 artículos revisados por pares y publicados en las últimas dos décadas. Encontramos tres tipos de tonos en los medios de comunicación analizados en los estudios de ambos países, ordenados aquí de mayor a menor frecuencia: negativo, neutro y positivo. Los medios de comunicación infrarrepresentan a los principales actores y utilizan estereotipos y discursos que trazan una frontera entre nosotros/as y los/as otros/as. Este trabajo contribuye a nuestra comprensión de las diferencias entre los estudios realizados en el Reino Unido y Brasil, y reclama más estudios comparativos que incluyan países del sur y del norte global. También demuestra la existencia de patrones de representación similares en ambos países.
La disgrâce de Nicolas Bourriaud. La figure du « leader créatif » et les critères de légitimité dans le monde de l’art
Authors: Riot Elen 
Published: January 2022

Nicolas Bourriaud orchestra sa cérémonie de départ de l’école des Beaux-Arts de Paris après son renvoi ad nutum par la Ministre de la Culture. Il en fit un spectacle parodique devant son bureau à l’Académie des Beaux-Arts, scène à laquelle nous assistâmes. Nous revenons sur cet épisode afin de mieux comprendre les circonstances qui précédèrent cet ultime éclat et ce qui s’ensuivit au sein de l’institution et du monde de l’art. Afin de mieux saisir les enjeux, nous identifions un rôle, celui du « leader créatif » supposé remplir la mission de directions d’institutions culturelles et artistiques aujourd’hui. Force est de constater que les attentes des multiples parties prenantes, s’ajoutant à celles de la tutelle publique, ne laissent pas de compliquer la tâche de l’heureux élu. Faut-il alors, pour le leader créatif, privilégier les projets de développement ou bien la recherche de financements complémentaires pour colmater les murs de l’école ? Faut-il privilégier l’urgence du changement ou le temps long de structures qui se transformeraient à bas bruit dans le grand bain d’un environnement-monde ? Il semble qu’il faille faire tout cela, oui, et en même temps. Or, les contradictions ne manquent pas quand il s’agit d’envisager ces présents changements au regard du passé et de l’avenir. Nous cherchons donc, dans ce texte, à comprendre le processus de légitimation et de délégitimation du « leader créatif » et ce que cela implique pour le monde de l’art et les artistes notamment dans le cadre
L’approche esthétique au service de la formulation de la stratégie organisationnelle : l’exemple d’une Université française
Authors: Ivanaj Vera , Berger-Douce Sandrine 
Published: January 2022

Cet article explore la manière dont l’approche esthétique contribue à enrichir la formulation de la stratégie en sortant des sentiers battus, répondant aux récents appels à l’introduction de davantage de « sensibilité » dans le champ du management stratégique pour contrer la domination de la rationalité et du positivisme. Face à l’omniprésence de l’incertitude dans les organisations, celles-ci sont en quête de démarches innovantes pour penser le changement. A ce titre, les méthodes inspirées de l’art semblent particulièrement pertinentes. C’est pourquoi, une recherche-intervention par intervention artistique menée par l’un des auteurs auprès d’une université française pluridisciplinaire sert de terrain d’investigation pour questionner les apports potentiels d’une approche esthétique au service de la formulation de la stratégie d’une catégorie spécifique d’organisations, en l’occurrence les universités. Depuis plusieurs décennies, les recherches soulignent le caractère atypique des universités s’agissant de leur rapport à la stratégie, alors que ces institutions sont désormais confrontées à des injonctions paradoxales leur imposant de se réinventer pour relever les défis de la compétition mondiale. Notre étude met en évidence l’apport de l’approche esthétique tant au niveau des caractéristiques du processus de décision stratégique qu’au niveau des résultats de ce processus. La formulation de la stratégie semble être facilitée par l’intégration de processus cognitifs, émotionnels et corporels qui stimulent la créativité et conduisent à une compréhension intuitive et imaginative du sens de la stratégie et de sa complexité. Cette compréhension apporte satisfaction et motivation, mais aussi des changements de comportements et de valeurs aux niveaux individuel et organisationnel grâce au pouvoir évocateur de la métaphore et à l’énergie stimulante du dessin et de la peinture.
Ars longa, vita brevis . Les paradoxes organisationnels au prisme du street art
Authors: Aubouin Nicolas , Le Chaffotec Alexandra , Koskievic Jean-Max , Tarby Clémence 
Published: January 2022

L’objectif de cet article est de renouveler le dialogue entre art et organisation en mettant en lumière le rôle du street art comme révélateur des tensions organisationnelles et de ses paradoxes. Pour comprendre le rôle d’artefact organisationnel d’une œuvre de street art, nous l’analysons en tant que pratique artistique intégrée dans un processus d’institutionnalisation qui met en tension quatre dimensions clés de l’analyse organisationnelle : éphémère/pérenne ; visible/invisible ; individuel/collectif ; improvisation/routines. Ces dimensions font alors écho à quatre logiques paradoxales de l’organisation (Smith & Lewis, 2011) que nous mettons en évidence autour des enjeux de l’apprentissage, de l’appartenance, de la gestion et de l’exécution. Aussi, en partant plus spécifiquement du travail du street artiste Invader, et notamment de son œuvre « Dr House », nous révélons les tensions « à l’œuvre » et « en œuvre » dans les organisations, ce qui nous permet de mettre en lumière trois dimensions clés de l’œuvre comme artefact pédagogique, moteur de l’action managériale et moteur de la méthodologie de recherche en sciences de gestion. Ce travail suggère finalement une meilleure compréhension du déclenchement des paradoxes et de l’accompagnement de la gestion des paradoxes dans les organisations.
Paro migrante en Argentina: el trabajo como subjetividad política
Authors: Rho María Gabriela 
Published: January 2022

El objetivo del artículo es indagar la forma en que emerge y lugar que ocupa el trabajo como figura predominante de los procesos de subjetivación política de luchas migrantes que se configuraron en Argentina a partir de 2016. Para esto, se utilizó una metodología cualitativa que combinó el análisis documental, el registro de campo y entrevistas en profundidad. La sistematización y análisis de la información permite plantear que posicionarse –por parte de los migrantes– como trabajadores fue una estrategia defensiva para enfrentar los discursos y las prácticas estatales criminalizantes de la migración, a la vez que constituyó una forma de disputar las representaciones dominantes que pretendían victimizarlos y anularlos políticamente. Reconocerse como trabajadores se convirtió en una manera desde donde los migrantes se constituyeron como sujetos políticos, a partir de un doble movimiento de visibilización y fuga. Es decir, en la producción de subjetividad política vinculada al trabajo se registra una tensión entre la búsqueda de reconocimiento y de contabilización de los trabajos realizados por los migrantes, al mismo tiempo que se pretende revelar y rechazar las prácticas y políticas migratorias que buscan invisibilizarlos políticamente e intentan producir formas diferenciales y jerarquizadas de explotación de la mano de obra migrante.
An immunoglobulin Y that specifically binds to an in silico-predicted unique epitope of Zika virus non-structural 1 antigen
Authors: Guevarra Leonardo A. , De Sagon Scott Dean P. , Teh Treena Rica D. , Cruz Maria Katrina Diana M. , Capistrano Nikki Cyrill C. , Maria Austine James Z. Sta. , Corales Laarni Grace M. , Dalmacio Leslie Michelle M. 
Published: January 2022

Objective:
To identify unique immunogenic epitopes of Zika virus non-structural 1 (NS1) antigen and produce immunoglobulin Y (IgY) for potential use in he diagnosis of of Zika virus infection.

Methods:
Immunogenic epitopes were identified using in silico B-cell epitope prediction. A synthetic peptide analog of the predicted epitope was used to induce antipeptide IgY production in hens which was purified using affinity chromatography. Presence of purified IgY and its binding specificity were performed by gel electrophoresis and ELISA, respectively.

Results:
Out of the nine continuous epitopes identified, the sequence at position 193-208 (LKVREDYSLECDPAVI) was selected and used to produce anti-peptide IgY. The produced IgY was found to bind to the synthetic analog of the Zika virus NS1 immunogenic epitope but not to other flaviviruses and random peptides from other pathogens.

Conclusions:
In this study, we identified an immunogenic epitope unique to Zika virus that can be used to develop a serodiagnostic tool that specifically detect Zika virus infection.
Harpephyllum caffrum stimulates glucose uptake, abates redox imbalance and modulates purinergic and glucogenic enzyme activities in oxidative hepatic injury
Authors: Olofinsan Kolawole A. , Erukainure Ochuko L. , Brian Beseni K. , Islam Md. Shahidul 
Published: January 2022

Objective:
To investigate the antioxidative and antidiabetic effects of Harpephyllum caffrum bark infusion as well as its effects on glucogenic and nucleotide hydrolyzing enzyme activities in FeSO4- induced oxidative stress in rat hepatic tissue.

Methods:

Harpephyllum caffrum infusion was prepared from dried plant materials (40 g) infused in boiling water (400 mL) for 20 min at room temperature. The antioxidative and inhibitory activities against carbohydrate digestive enzymes of the infusion were determined using established protocols. The liver tissues of rats were used for glucose uptake assay and to evaluate the infusion's effect on endogenous antioxidant, glucogenic, and nucleotide hydrolyzing enzyme activities in FeSO4-induced hepatic injury.

Results:
The Harpephyllum caffrum infusion significantly reduced ferric iron (FRAP) and free radicals (OH• and DPPH) in a dose- dependent manner. It inhibited α-amylase and α-glucosidase activities and increased glucose uptake in hepatic tissues. FeSO4 significantly decreased glutathione concentration, catalase, and superoxide dismutase activities while increasing malondialdehyde level, glycogen phosphorylase, fructose-1,6-bisphosphatase, and adenosine triphosphatase activities. However, treatment with Harpephyllum caffrum infusion reversed FeSO4-induced changes. Characterization of the infusion revealed the presence of catechol, O-pyrocatechuic acid, mequinol, maltol, and glycoside derivatives.

Conclusions:
The Harpephyllum caffrum infusion demonstrates antidiabetic and antioxidative potentials in in vitro models of type 2 diabetes as depicted by its ability to inhibit carbohydrate digestive enzymes, mitigate oxidative imbalance, and regulate glucogenic and nucleotide hydrolyzing enzyme activities in oxidative hepatic injury.
Schisandrae Fructus oil-induced elevation in serum triglyceride and lipoprotein concentrations associated with physiologic hepatomegaly in mice
Authors: Pan Si-Yuan , Song Xue-Lan , Lin Zhao-Heng , Yu Qing , Zhang Yi , Tai Hai-Chuan , Luo Gan , Wang Xiao-Yan , Zhu Pei-Li , Sun Nan , Chu Zhu-Sheng , Yu Zhi-Ling , Ko Kam-Ming , Zhang Yi 
Published: January 2022

Objective:
To investigate hypertriglyceridemia and hepatomegaly caused by Schisandrae Sphenantherae Fructus (FSS) and Schisandra chinensis Fructus (FSC) oils in mice.

Methods:
Mice were orally administered a single dose of Schisandrae Fructus oils. Serum and hepatic triglyceride (TG), triglyceride transfer protein (TTP), apolipoprotein B48 (Apo B48), very-low-density lipoprotein (VLDL), hepatocyte growth factor (HGF), alanine aminotransfease (ALT) and liver index were measured at 6-120 h post-dosing.

Results:
FSS and FSC oil caused time and dose-dependent increases in serum and hepatic TG levels, with maximum increases in the liver (by 297% and 340%) at 12 h post-dosing and serum (244% and 439%) at 24-h post-dosing, respectively. Schisandrae Fructus oil treatments also elevated the levels of serum TTP by 51% and 63%, Apo B48 by 152% and 425%, and VLDL by 67% and 38% in mice, respectively. FSS and FSC oil treatments also increased liver mass by 53% and 55% and HGF by 106% and 174%, but lowered serum ALT activity by 38% and 22%, respectively. Fenofibrate pre/ co-treatment attenuated the FSS and FSC oil-induced elevation in serum TG levels by 41% and 49% at 48 h post-dosing, respectively, but increased hepatic TG contents (by 38% and 33%, respectively) at 12 h post-dosing.

Conclusions:
Our findings provide evidence to support the establishment of a novel mouse model of hypertriglyceridemia by oral administration of FSS oil (mainly increasing endogenous TG) and FSC oil (mainly elevating exogenous TG).