bluuebunny/crossref_metadata_2025_split huggingface dataset:
Swift-XRT and NuSTAR Monitoring of Obscuration Variability in Mrk 477
Authors: Torres-Albà N. , Hu Z. , Cox I. , Marchesi S. , Ajello M. , Pizzetti A. , Pal I. , Silver R. , Zhao X. 
Published: February 2025

Abstract
We present the analysis of 15 X-ray observations of Mrk 477, a nearby Seyfert 2 active galactic nucleus, with the objective to monitor its obscuring column density variability. The full data set consists of five archival observations, split into two XMM-Newton, two NuSTAR and one Chandra observation, plus two dedicated monitoring campaigns. The monitoring campaigns were performed with Swift-XRT and NuSTAR, containing five observations each. We performed a simultaneous analysis using self-consistent torus models, deriving geometric properties of the torus as well as the obscuration along the line of sight. Mrk 477 is best modeled with a torus with a large covering factor yet low column density (on average). Its line-of-sight column density oscillates between 1.5 and 7 × 1023 cm−2. Mrk 477 presents frequent obscuring column density variability, on timescales as short as ∼2 weeks. The probability of drawing a pair of obscuration-variable observations for Mrk 477 when having two, three, and four observations is 40%, 78%, and 95%, respectively. Adding the results of this work to those of another 26 sources, we find a trend of increasing obscuration variability with time (from ∼20% at Δt < 10 days, to ∼60%–70% at timescales larger than 5 yr). We discuss whether this is compatible with the majority of obscuration variability coming from broad-line region clouds.
Probing 3D Magnetic Fields Using Starlight Polarization and Grain Alignment Theory
Authors: Truong Bao , Hoang Thiem 
Published: February 2025

Abstract
Polarization of starlight induced by dust grains aligned with the magnetic field (hereafter B-field) is widely used to measure the 2D B-fields projected onto the plane-of-sky. Here, we introduce a new method to infer 3D B-fields using starlight polarization. We show that the inclination angle or line-of-sight component of B-fields can be constrained by the starlight polarization efficiency from observations, the alignment degree provided by the magnetically enhanced radiative torque (MRAT) alignment theory, and the effect of B-field tangling. We first perform synthetic observations of starlight polarization of magnetohydrodynamic (MHD) simulations of a filamentary cloud with our updated POLARIS code incorporating the modern MRAT theory. We test the new technique with synthetic observations and find that the B-field inclination angles can be accurately determined by the synthetic starlight polarization efficiency once the effects of grain alignment, dust properties, and B-field fluctuations are well characterized. The technique can provide an accurate constraint on B-field inclination angles using optical polarization in low-density regions A
V < 3 with efficient MRAT alignment, whereas the technique can infer further to high-density regions with significant alignment loss at A
V ∼ 8–30 by using near-infrared polarization. Our new technique unlocks the full potential of tracing 3D B-fields and constraining dust properties and grain alignment physics on multiple scales of the diffuse interstellar medium and star-forming regions using multiwavelength starlight polarization observations.
Fading Light, Fierce Winds: JWST Snapshot of a Sub-Eddington Quasar at Cosmic Dawn
Authors: Lyu 吕 Jianwei 建伟 , Rieke George H. , Stone Meredith , Morrison Jane , Alberts Stacey , Jin Xiangyu , Zhu Yongda , Liu 刘 Weizhe 伟哲 , Yang Jinyi 
Published: February 2025

Abstract
The majority of most luminous quasars during the epoch of reionization accrete near or above the Eddington limit, marking the vigorous growth of primitive supermassive black holes (SMBHs). However, their subsequent evolution and environmental impact remain poorly characterized. We present JWST/NIRSpec prism integral field unit observations of HSC J2239+0207, a low-luminosity quasar at z ∼ 6.25 likely in a late stage of mass assembly with an overmassive SMBH relative to its host galaxy. Using Hβ and Hα broad emission lines, we estimate an SMBH mass M
BH ∼ 3 × 108
M
⊙ and confirm its sub-Eddington accretion at λ
Edd ∼ 0.4. Strong Fe ii emission and a proximity zone of typical size suggest a metal-rich, highly evolved system. In the far-UV, this quasar presents strong broad absorption line features, indicative of high-velocity winds (ν ∼ 104 km s−1). Meanwhile, minimal dust reddening is inferred from the quasar continuum and broad-line Balmer decrement, suggesting little dust along the polar direction. Most interestingly, we identify a gas companion ∼5 kpc from the quasar with a high [O iii]/Hβ ratio (≳10), likely representing outflowing gas blown away by active galactic nucleus (AGN) feedback. These results highlight HSC J2239+0207 as a likely fading quasar in transition, providing rare insights into SMBH evolution, AGN feedback, and AGN–galaxy interactions in the early Universe.
Au milieu d’une nature intacte. La représentation des paysages du Venezuela dans le récit de voyage et les œuvres du peintre Ferdinand Bellermann (1842-1845)
Authors: Magnin Lucile 
Published: February 2025

Cet article propose un aperçu de la vie et de l’œuvre du peintre voyageur Ferdinand Bellermann (1814-1889), et en particulier de son séjour de trois ans au Venezuela, à travers le témoignage qu’il a laissé de cette aventure : son récit de voyage, traduit en espagnol et publié à Caracas en 2007, et ses dessins et peintures de la nature tropicale, conservés pour la plupart au Kupferstichkabinett de Berlin. L’étude de son récit et de ses productions artistiques nous montre que l’émerveillement demeure au cœur de son expérience de voyageur, tout comme l’observation minutieuse des plantes. Le bonheur de découvrir de nouveaux paysages s’exprime souvent à travers l’analogie dans le discours, de même que les paysages tropicaux vierges de toute représentation picturale sont en fait souvent perçus par l’artiste à travers les schèmes de la peinture classique européenne.
Les trois corps du psoriasis
Authors: Halloy Arnaud 
Published: February 2025

Cet article explore les apprentissages sensibles de personnes atteintes de psoriasis, une maladie inflammatoire chronique de la peau et/ou des articulations. Deux questions sont au cœur de cette recherche : Qu’apprennent les personnes de la manière dont la maladie les affecte ? Et que font-elles de ce que la maladie leur fait ? Parmi les principaux résultats, notre enquête a mis en évidence trois modes de perception du corps : le corps-Objet, le corps-Sujet et le corps-Ressource. Chacun de ces corps correspond à une « sensibilité à » (Récopé et al. 2013), un registre de sensibilité caractérisé par un régime attentionnel, des modalités d’action et des enjeux qui lui est propre. Le « corps-Objet » se focalise sur les symptômes qui sont objectivement décrits et que la personne cherche à éliminer, le « corps-Sujet » appréhende le corps et ses symptômes à partir des effets qu’ils produisent sur le vécu de la maladie tandis que le « corps-Ressource » fait du corps une ressource potentielle pour divers apprentissages sensibles relatifs à l’anticipation de la progression de la maladie ainsi qu’à une meilleure gestion de la vie émotionnelle avec la maladie.
L’interaction comme problème et solution en EMS psychogériatrique
Authors: Malbois Fabienne 
Published: February 2025

Partant de l’idée que la « logique de care » est sensible au contexte, cet article donne une consistance empirique à l’attitude expérimentale qui est le propre des approches centrées sur la personne dans les établissements médico-sociaux (EMS) psychogériatriques. Il commence par décrire le style de care mis en œuvre dans le cas étudié, la façon dont celui-ci aménage une place au sujet sentant notamment. Il s’attache ensuite à caractériser les trois formes d’enquête professionnelle auxquelles ouvre ce style de care, et leurs épreuves spécifiques. Une attention particulière est accordée aux différentes voies par lesquelles les expériences problématiques des résident·es sont transformées (la manipulation, l’ajustement, la fabrication), aux rôles que joue l’observation – et donc l’œil – dans la conduite de ces processus, ainsi qu’aux différents arts de faire, ou savoirs pratiques, qui y sont engagés.
Observer le corps et catégoriser les signes : doutes et (in-)certitudes épistémiques dans l’art médical de l’Antiquité à la Renaissance
Authors: Marcucci Laetitia 
Published: February 2025

Physiognomonie et médecine sont historiquement liés et reposent sur une sémiologie visant l’opérativité des savoirs. Leur intrication y compris dans le rapport au probable et à l’incertain n’a pas suffisamment été soulignée. Or, le sêméion occupe une place centrale dans les doutes épistémiques qui les traversent de l’Antiquité à la Renaissance. Comment construisent-elles un modèle de connaissance et un art du jugement en contexte d’incertitude ? Quelle est la part dévolue aux catégorisations et à l’in-certain dans le regard porté sur les corps ? Comment les discours de positivité s’emparent-ils d’une connaissance incertaine ? L’enquête s’appuiera sur une méthode philosophique, historique et conceptuelle et un corpus de textes physiognomoniques et médicaux. Entre continuités, ruptures et chevauchements de paradigmes, on éclairera les vertus épistémiques de l’incertain dans l’art médical.
Métaphores de la connaissance incertaine : penser avec Blumenberg
Authors: Brossier Madeleine 
Published: February 2025

Cet article se propose de prolonger deux études métaphorologiques qui se déploient dans l’œuvre de Hans Blumenberg, celle de la connaissance comme terre ferme, et celle de la lumière comme vérité, en les interrogeant par leur envers : il s’agira de les interpréter à l’aune des pensées sceptiques. La métaphore du « fond » de la connaissance, d’une part, remonte à l’Antiquité et se cristallise chez Descartes. Si les scepticismes que l’on qualifiera de « transitoires » ne remettent pas en cause le primat établi par les philosophies dogmatiques du certain sur l’incertain, c’est-à-dire du fixe sur le mouvant, d’autres voies sceptiques ont au contraire permis de souligner les vertus du renoncement à la quête du socle. La métaphore de la lumière comme vérité, d’autre part, traverse elle aussi l’histoire de la philosophie. Cette fois-ci, il s’agira de distinguer le scepticisme radical qui se nourrit d’une obscurité assumée d’un scepticisme poétique, dont Philippe Jaccottet fournira l’exemple, et qui se métaphorise par la lueur.
Formes et occurrences de l’incertitude en psychanalyse
Authors: David-Ménard Monique 
Published: February 2025

Je distingue successivement trois modes d’incertitude en psychanalyse. L’incertitude caractérise d’abord la progressive connaissance d’un cas qui se présente au connaître comme une énigme et qu’il s’agit de construire comme singulier. L’incertitude de la connaissance tient ensuite à l’alliance très particulière du savoir et du non savoir dans la pratique et la théorie de la psychanalyse. Elle tient enfin à la mise au point d’une nouvelle définition du champ même auquel la psychanalyse a affaire : un certain régime des actes dans l’existence humaine qui s’annonce dans le phénomène clinique de la répétition et qui caractérise le pulsionnel comme un « morceau d’activité » à l’œuvre dans la transposition des impasses de la vie pulsionnelle, c’est-à-dire des symptômes par transposition dans le site construit par la cure.
« A good sign of climate change » : quand le rapport aux dynamiques environnementales conditionne la perception des effets du changement climatique. Le cas de Ma’uke et Manihiki (îles Cook)
Authors: Glory David 
Published: February 2025

À Ma’uke et Manihiki, (îles Cook – Pacifique sud), il est une représentation du changement climatique qui soulève de nombreuses interrogations : celle qui consiste à voir des effets positifs du changement climatique là où le discours général tend à ne mettre en avant que des effets particulièrement néfastes. Le traitement de la question de la positivité des effets du changement climatique souffre d’un certain paradoxe : celui d’être peu audible dans les discours officiels alors même qu’il semble avoir une place réelle dans des réalités de terrain observées. Dans cet article, nous allons aborder cette question en formulant l’hypothèse suivante : l’existence de ce discours mélioratif sur le changement climatique trouve son origine dans le rapport que les insulaires entretiennent avec leur environnement, et ce, bien avant l’émergence du changement climatique. Pour cela, les représentations insulaires seront mises en perspective avec celles des acteurs environnementaux. Nous verrons alors que deux définitions distinctes du concept d’environnement se dessinent, à travers les notions de nature-environnante et d’environnement originel. À partir de ces deux conceptions, deux rapports à l’environnement seront décrits, correspondant à deux manières d’interpréter la dynamique environnementale. Le premier rapport, dit conservationniste, associé à la conception des acteurs environnementaux, envisage tout changement comme une altération d’un équilibre préexistant à la présence humaine. Le second rapport, dit pragmatique, associé à la conception des insulaires, considère le changement comme une nécessité qui permet d’améliorer la condition héritée des générations précédentes. Nous conclurons que le discours positivant certains effets du changement climatique s’intègre à une conception locale envisageant chaque changement observé non pas comme devant être rejeté par principe, mais au contraire, comme étant un indice potentiel d’amélioration de son environnement.
Multivariate analysis of near additions for presbyopic patients at a rural optometry clinic
Authors: Maluleke Khisimusi D. , Hasrod Nabeela , Rubin Alan 
Published: February 2025

Background: Presbyopia is often overlooked in refractive error distribution analysis. This article employs multivariate analysis to address this gap, enhancing understanding of means, outliers and variations through graphical data presentation.Aim: To analyse the distribution of near-corrective optical additions for presbyopic patients over 2 years at a rural optometry clinic.Setting: The study was conducted at Sekororo District Hospital, South Africa.Methods: Non-cycloplegic near-refractive error data for presbyopic patients who visited the clinic at the district hospital from January 2018 to December 2019 were extracted from the hospital’s records. The records were randomly divided into two groups for 2018 and 2019. Meridional plots and stereo-pair scatter plots were used to analyse the refractive states for the right (OD) and left (OS) eyes.Results: In the 2018 sample, the clinical means for OD and OS were +1.33 ‒0.32 × 90 and +2.01 ‒0.37 × 77, respectively. Similarly, for the 2019 sample, the clinical means for OD and OS were +2.01 ‒0.32 × 82 and +1.82 ‒0.18 × 95, respectively. The data were not normally distributed, and outliers were present. Sample variances were spherical rather than astigmatic.Conclusion: Deviation from the normality showed that the data for OD and OS were mainly mildly positively skewed. Much of the variation in the refractive state was spherical (the stigmatic) irrespective of the laterality.Contribution: The article makes a valuable contribution to the current understanding of multivariate analysis, in academic training including optometry fraternity, as it pertains to the refractive state of the eyes in a rural optometry clinic.
Water service delivery challenges in Modimolle-Mookgophong Local Municipality, Limpopo, South Africa
Authors: Seema Tumelo C. , Molepo John N. , Maleka Caiphus M. 
Published: February 2025

Background: Water is not equally accessible, and climate change is altering patterns of weather and rainwater around the world, causing shortages that will both intensify water scarcity and threaten the quality of the current water supply.Aim: The study analyses the effectiveness of Modimolle-Mookgophong Local Municipality (MMLM) in provisioning water services. This study took place in the Limpopo province of South Africa.Methods: A mixed-method approach was adopted under a pragmatic paradigm. The researcher used both probability and non-probability sampling techniques, including random and purposive sampling, to select participants for interviews and questionnaires. This was done to understand the challenges of water service delivery among the MMLM community members.Results: Research findings revealed that the MMLM operates at about 70% capacity as a Water Service Authority. The water system, mostly asbestos pipes, is heavily deteriorated, affecting around 80% of the network. Frequent winter pipe bursts particularly common in winter and illegal connections in informal settlements further strain water provision.Conclusion: The study established that MMLM faces several service delivery challenges related to the delivery of water. Although the local government has the primary constitutional obligation to deliver basic services such as water provisioning, the national and provincial governments should play a significant role in supporting municipalities to fulfil these obligations.Contribution: This study will benefit municipalities and officials in improving future water service delivery. It will also guide other local municipalities facing similar challenges, helping establish a more efficient and effective water service system.
Spatiotemporal analysis of African swine fever in wild boar in Serbia from 2020 to 2024
Authors: Glišić Dimitrije , Šolaja Sofija , Veljović Ljubisa , Maksimović-Zorić Jelena , Milićević Vesna 
Published: February 2025

African swine fever (ASF) is a highly fatal viral haemorrhagic disease affecting pigs. This study uses official surveillance data to investigate the persistence and spread of ASF in wild boar populations in Serbia from 2020 to 2024. A total of 480 ASF cases were analysed, with spatiotemporal clustering conducted via SaTScan™ and proximity analyses performed in the Quantum Geographic Information System. The yearly prevalence of ASF in wild boar rose steadily from 0.66% in 2020 to 1.47% in 2023. Seasonal trends showed a significant increase in cases during winter (68%) and spring (24%). Five distinct clusters were identified, predominantly near the borders with North Macedonia and Bulgaria, suggesting potential cross-border transmission. Proximity to major roads was significantly associated with ASF case distribution (p 0.01), while proximity to water bodies and elevation showed no consistent pattern. The findings highlight critical gaps in current passive surveillance systems, which likely underestimate ASF prevalence. The study underscores the need for enhanced surveillance in remote and wooded areas and proposes strategies to improve ASF monitoring and control in wild boar populations.Contribution: This study highlights the feasibility of cost-effective, non-invasive surveillance methods for ASF detection, offering critical insights for low-income countries where resources for intensive disease monitoring are limited. By demonstrating how environmental and anthropogenic factors drive ASF dynamics, this research provides actionable strategies for improving regional and global ASF control efforts.
From mother tongue to English: A language policy shift at a multilingual township school in Gauteng
Authors: Sibanda Rockie , Tshehla Lina P. 
Published: February 2025

Background: Given the lack of research into English language instruction in multilingual contexts, this study explored the switch from mother tongue to English in a South African township school.Aim: This study aims to find out how teachers and parents view the implementation of English as a medium of instruction.Setting: The study was conducted at a multilingual township primary school that implemented an English-medium instruction policy from the foundation phase.Methods: A case study approach was applied to this qualitative research study. Semi-structured interviews were conducted with four foundation phase teachers and three parents of learners. In addition, observations of the classes of the selected teachers were made, and the data were analysed thematically.Results: The findings suggest that the English medium of instruction poses barriers to effective learning and teaching at the foundation phase. For most township learners, English is not the dominant language in their everyday interactions, and they have limited contact with the language outside the classroom. In addition, most teachers struggle to use English as a medium of instruction.Conclusion: Although some schools have shifted to an English medium policy, the decision appears ill-conceived because its success is insignificant in South Africa, where English is the first additional language for most learners and teachers.Contribution: The findings offer a research framework formulated by integrating past literature, and a theoretical framework for understanding the English medium of instruction where learners are exposed to multiple languages.
Exploring the necessity of corporate dynamic capability and sustainable performance
Authors: Mingxing Li , Zhiqiang Ma , Ge Bailin , Xinping Song , Heydari Mohammad , Bwabo Maulid H. 
Published: February 2025

Background: Many studies navigated corporate dynamic capability’s direct and indirect effects on sustainable performance. However, there is an empirical literature conundrum regarding the sufficient and necessary condition of corporate dynamic capability that can enhance the sustainable performance of microfirms.Aim: The main goal of this study is to explore the necessary and sufficient conditions for corporate dynamic capabilities that support sustainable performance and to determine if agility mediates the relationships between knowledge sharing, managerial cognitive capabilities, sensing capabilities, and sustainable performance.Setting: This study surveyed 440 Tanzanian dairy microfirms between July 2021 and January 2022.Method: Partial least squares-path modeling (PLS-PM) and necessary conditions analysis (NCA) were applied from the data collected from 602 managers and employees of microfirms in Tanzania.Results: The study confirmed that a higher degree of agility, and sensing capability among employees is necessary and sufficient for achieving sustainable performance of microfirms. Agility possibly confounds the relationships between sensing capability, knowledge sharing and managerial cognitive capability on sustainable performance.Conclusion: Knowledge sharing, agility and sensing capability are crucial for sustainable performance, while other dynamic capability factors are not critically sufficient and necessary for growth.Contribution: The study offers valuable insights by identifying critical levels of agility, knowledge sharing, managerial cognitive capability, and sensing capability sufficient for sustainable performance in dairy microfirms. It also provides empirical evidence of agility’s complementary role in mediating the effects of knowledge sharing, sensing capability, and managerial cognitive capability on sustainable performance.