bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Parsec-scale Catalog of Molecular Clouds in the Solar Neighborhood Based on 3D Dust Mapping: Implications for the Mass–Size Relation
Authors: Cahlon Shlomo , Zucker Catherine , Goodman Alyssa , Lada Charles , Alves João 
Published: January 2024

Abstract
We dendrogram the Leike et al. 3D dust map, leveraging its ∼1 pc spatial resolution to produce a uniform catalog of molecular clouds in the solar neighborhood. Using accurate distances, we measure the properties of 65 clouds in true 3D space, eliminating much of the uncertainty in mass, size, and density. Clouds in the catalog contain a total of 1.1 × 105
M
☉, span distances of 116−440 pc, and include a dozen well-studied clouds in the literature. In addition to deriving cloud properties in 3D volume density space, we create 2D dust extinction maps from the 3D data by projecting the 3D clouds onto a 2D “Sky” view. We measure the properties of the 2D clouds separately from the 3D clouds. We compare the scaling relation between the masses and sizes of clouds following Larson. We find that our 2D projected mass–size relation, M ∝ r
2.1, agrees with Larson's Third Relation, but our 3D derived properties lead to a scaling relation of about one order larger: M ∝ r
2.9. Validating predictions from theory and numerical simulations, our results indicate that the mass–size relation is sensitive to whether column or volume density is used to define clouds, since mass scales with area in 2D (M ∝ r
2) and with volume in 3D (M ∝ r
3). Our results imply a roughly constant column and volume density in 2D and 3D, respectively, for molecular clouds, as would be expected for clouds where the lower density, larger volume-filling gas dominates the cloud mass budget.
Redshifted Iron Emission and Absorption Lines in the Chandra X-Ray Spectrum of Centaurus A
Authors: Bogensberger David , Miller Jon , Kammoun Elias , Mushotzky Richard , Brenneman Laura , Brandt W. N. , Cackett Edward M. , Fabian Andrew , Kaastra Jelle , Dattathri Shashank , Behar Ehud , Zoghbi Abderahmen 
Published: January 2024

Abstract
Cen A hosts the closest active galactic nucleus to the Milky Way, which makes it an ideal target for investigating the dynamical processes in the vicinity of accreting supermassive black holes. In this paper, we present 14 Chandra HETGS spectra of the nucleus of Cen A that were observed throughout 2022. We compared them with each other, and contrasted them against the two previous Chandra HETGS spectra from 2001. This enabled an investigation into the spectral changes occurring on timescales of months and 21 years. All Chandra spectra could be well fitted by an absorbed power law with a strong and narrow Fe Kα line, a leaked power-law feature at low energies, and Si and S Kα lines that could not be associated with the central engine. The flux of the continuum varied by a factor of 2.74 ± 0.05 over the course of the observations, whereas the Fe line only varied by 18.8% ± 8.8%. The photon index increased over 21 years, and the hydrogen column density varied significantly within a few months as well. The Fe Kα line was found at a lower energy than expected from the Cen A redshift, amounting to an excess velocity of

326

−
94

+
84

km

s

−
1

relative to Cen A. We investigated warped accretion disks, bulk motion, and outflows as possible explanations of this shift. The spectra also featured ionized absorption lines from Fe xxv and Fe xxvi, describing a variable inflow.
“Tidal Peeling Events”: Low-eccentricity Tidal Disruption of a Star by a Stellar-mass Black Hole
Authors: Xin Chengcheng , Haiman Zoltán , Perna Rosalba , Wang Yihan , Ryu Taeho 
Published: January 2024

Abstract
Close encounters between stellar-mass black holes (BHs) and stars occur frequently in dense star clusters and in the disks of active galactic nuclei. Recent studies have shown that in highly eccentric close encounters, the star can be tidally disrupted by the BH in a microtidal disruption event (microTDE), resulting in rapid mass accretion and possibly bright electromagnetic signatures. Here we consider a scenario in which the star might approach the stellar-mass BH in a gradual, nearly circular inspiral, under the influence of dynamical friction in a circum-binary gas disk or three-body interactions in a star cluster. We perform hydrodynamics simulations of this scenario using the smoothed particle hydrodynamics code PHANTOM. We find that under certain circumstances (for initial eccentricity e
0 ≳ 0.4 and penetration factor β = 1, or e
0 < 0.4 and β ≲ 0.67), the mass of the star is slowly stripped away by the BH. We call this gradual tidal disruption a “tidal-peeling event.” Additionally, we discover that some low-eccentricity microTDEs (e
0 < 0.4 and β = 1) are a new form of fast luminous transients similar to parabolic microTDEs. Depending on the initial distance and eccentricity of the encounter, these low-eccentricity microTDEs might exhibit significant accretion rates and orbital evolution distinct from those of a typical (eccentric) microTDE.
Dissecting the γ-Ray Emissions of the Nearby Galaxies NGC 1068 and NGC 253
Authors: Ji Shunhao , Wang Zhongxiang , Xing Yi , Yan Dahai , Zheng Jintao 
Published: January 2024

Abstract
Intrigued by recent high-energy study results for nearby galaxies with γ-ray emission and in particular NGC 1068 that has been detected as a neutrino-emitting source by the IceCube Neutrino Observatory, we conduct a detailed analysis of the γ-ray data of the galaxies NGC 1068 and NGC 253, obtained with the Large Area Telescope on board the Fermi γ-ray Space Telescope. By checking their possible spectral features and then constructing light curves in the corresponding energy ranges, we identify spectral-change activity from NGC 1068 in the ≥2 GeV energy range and long-term, statistically significant changes for NGC 253 in the ≥5 GeV energy range. In the former, the emission appears harder in two half-year periods than in the otherwise “quiescent” state. In the latter, an ∼two-fold decrease in the detection significance after MJD = 57023 is clearly revealed by the test-statistic maps we obtain. Considering the previous studies carried out and the various models proposed for the γ-ray emissions of the two sources, we discuss the implications of our findings. We suspect that a jet (or outflow) in NGC 1068 might contribute to the γ-ray emission. The nature of the long-term statistically significant changes for NGC 253 is not clear, but since the part of the GeV emission may be connected to the very-high-energy (VHE) emission from the center of the galaxy, it could be further probed with VHE observations.
Measuring the Hubble Constant of Binary Neutron Star and Neutron Star–Black Hole Coalescences: Bright Sirens and Dark Sirens
Authors: Yu Jiming , Liu Zhengyan , Yang Xiaohu , Wang Yu , Zhang Pengjie , Zhang Xin , Zhao Wen 
Published: January 2024

Abstract
Observations of gravitational waves (GW) provide us with a new probe to study the Universe. GW events can be used as standard sirens if their redshifts are measured. Normally, standard sirens can be divided into bright/dark sirens according to whether the redshifts are measured by electromagnetic (EM) counterpart observations. First, we investigate the capability of the 2.5 m Wide-Field Survey Telescope (WFST) to take follow-up observations of kilonova counterparts. For binary neutron star (BNS) bright sirens, WFST is expected to observe 10–20 kilonovae per year in the second-generation GW detection era. As for neutron star–black hole (NSBH) mergers, when a BH spin is extremely high and the neutron star (NS) is stiff, the observation rate is ∼10 per year. Combining optical and GW observations, the bright sirens are expected to constrain the Hubble constant H
0 to ∼2.8% in five years of observations. As for dark sirens, the tidal effects of NSs during merging provide us with a cosmological model-independent approach to measure the redshifts of GW sources. Then we investigate the applications of tidal effects in redshift measurements. We find in the third generation era, the host galaxy groups of around 45% BNS mergers at z < 0.1 can be identified through this method, if the equation of state is ms1, which is roughly equivalent to the results from luminosity distant constraints. Therefore, tidal effect observations provide a reliable and cosmological model-independent method of identifying BNS mergers’ host galaxy groups. Using this method, the BNS/NSBH dark sirens can constrain H
0 to 0.2%/0.3% over a five-year observation period.
Dimorphos Orbit Determination from Mutual Events Photometry
Authors: Scheirich Peter , Pravec Petr , Meyer Alex J. , Agrusa Harrison F. , Richardson Derek C. , Chesley Steven R. , Naidu Shantanu P. , Thomas Cristina , Moskovitz Nicholas A. 
Published: January 2024

Abstract
The NASA Double Asteroid Redirection Test spacecraft successfully impacted the Didymos–Dimorphos binary asteroid system on 2022 September 26 UTC. We provide an update to its preimpact mutual orbit and estimate the postimpact physical and orbital parameters, derived using ground-based photometric observations taken from 2022 July to 2023 February. We found that the total change of the orbital period was −33.240 ± 0.072 minutes (all uncertainties are 3σ). We obtained the eccentricity of the postimpact orbit to be 0.028 ± 0.016 and the apsidal precession rate was 7.3 ± 2.0 degrees day−1 from the impact to 2022 December 2. The data taken later in 2022 December to 2023 February suggest that the eccentricity dropped close to zero or the orbit became chaotic approximately 70 days after the impact. Most of the period change took place immediately after the impact, but in the few weeks following the impact it was followed by an additional change of

−

27

−
58

+
19

s or −19 ± 18 s (the two values depend on the approach we used to describe the evolution of the orbital period after the impact—an exponentially decreasing angular acceleration or the assumption of a constant orbital period, which changed abruptly some time after the impact, respectively). We estimate the preimpact Dimorphos–Didymos size ratio was 0.223 ± 0.012 and the postimpact is 0.202 ± 0.018, which indicate a marginally significant reduction of Dimorphos’ volume by (9 ± 9)% as the result of the impact.
Transitions écologique et numérique : quelle régulation du sens par la Commission européenne ?
Authors: Hermand Marie-Hélène 
Published: January 2024

Cet article interroge la manière dont la Commission européenne (CE) fait coexister les arguments en faveur de la transition écologique et de la transition numérique, deux priorités stratégiques 2019-2024 difficilement conciliables. Aussi intimement liées sur le fond que séparées sur la forme, les transitions écologique et numérique font l’objet de deux rubriques distinctes sur le portail web de la CE : elles constituent le corpus de l’étude, multimodal et riche d’un point de vue éditorial. Après avoir situé notre démarche au sein des approches théoriques de la communication publique européenne et élaboré la méthodologie selon une approche discursive et sémiotique, nous confrontons les résultats de l’analyse du discours à ceux de l’étude des paysages textuels (textscapes). Les filiations discursives, les tensions, les variants (motifs, récits, modèles proposés ; lieux et moment signifiants) et les invariants (énoncés gnomiques) repérés permettent de préciser la doxa sur laquelle repose le paradoxe communicationnel considéré.
Comment La charte “Ya d’ar brezhoneg” est devenue un outil incontournable de la revitalisation et de la normalisation de la langue bretonne
Authors: Choplin Cédric 
Published: January 2024

Initiée et promue par l’Office de la langue bretonne (désormais Office public de la langue bretonne), la charte Ya d’ar Brezhoneg (Oui au breton) est devenue, après vingt ans d’existence, un outil incontournable de la revitalisation et de la normalisation de la langue bretonne. Avec pas moins de 790 structures privées, 231 communes et 15 structures intercommunales signataires, elle bénéficie d’une publicité et d’un impact certain dans tous les secteurs de la vie de la région. Comment cette charte a-t-elle été conçue et a pu rencontrer un tel succès, quelles sont aujourd’hui les limites des actions qu’elle porte, quelles en sont les perspectives ?Dans cet article, basé en grande partie sur des entretiens avec différents acteurs et l’étude de la presse, nous insisterons dans un premier temps sur la réflexion sociolinguistique qui a présidé à la conception de la charte ; dans un second temps, nous traiterons des clés de son succès et des rares réactions négatives qu’elle a pu susciter ; dans un troisième temps, nous reviendrons sur l’expérience de l’entrepreneur Denez Pichon, signataire de la charte dans son entreprise de hautes technologies.
Ironie ou malentendu ? Usages techno-discursifs et inégalités sémantiques dans les commentaires des réseaux socio-numériques
Authors: Ammari Djihane , Bacha Youcef 
Published: January 2024

La présente contribution s’inscrit dans le domaine de l’analyse du discours numérique, précisément l’analyse d’un techno-genre, celui des commentaires dans les réseaux socio-numériques. Nous y cherchons, d’abord, à dévoiler la particularité de l’usage de deux phénomènes discursifs à savoir : l’ironie et le malentendu dans une écologie numérique du discours produit dans le web 2.0 ; ensuite, à faire un distinguo entre ces deux procédés en termes de leur réception sémantique qui représente généralement un décalage du sens en matière de leur interprétation et de leur compréhension. Par une analyse qualitative des données, nous recourons à une page Facebook algérienne : Diridarek.com pour montrer que l’ironie est une résultante d’un malentendu, deux procédés utilisés dans l’intention de modifier le sens de l’énonciation première par les commentaires des réseaux socio-numériques.
Les avatars du formalisme russe et soviétique en Europe et aux États-Unis (1915-1968)
Authors: Fiszer Stanisław 
Published: January 2024

Dans la préface de la Théorie de la littérature (1965), Roman Jakobson affirme que c’est grâce au Cercle linguistique de Prague fondé en 1926 que les idées du formalisme russe « sont entrées dans la circulation mondiale ». En partant de cette affirmation, l’auteur de l’article cherche à établir les modes de diffusion des idées en question entre 1915 et 1968. Ensuite, il observe les facteurs sociaux et politiques qui ont facilité ou freiné leur circulation en Europe et aux États-Unis. Finalement, il étudie leurs transformations par rapport aux idées originelles.
À la recherche de Titine en Europe centrale (avant 1989)
Authors: Wojda Aleksandra 
Published: January 2024

Dédié aux circulations culturelles centre-européennes de la chanson Je cherche après Titine, l’article étudie ses nombreuses réécritures à succès proposées par des paroliers, traducteurs et interprètes de langue polonaise (Włast et Hemar), tchèque (Suchý) et hongroise (Harmath), qui ont contribué à son inscription durable dans le paysage sonore de la région. À partir d’une analyse de ce corpus, inspirée aussi bien des outils proposés par l’histoire culturelle des circulations (Csáky, Francfort, Poirrier & Le Texier) que de la cantologie (Hirschi, July, Zubiate), l’auteure réinterroge quelques catégories nodales pour l’approche de l’objet-chanson, insistant notamment sur les dimensions intertextuelles et intermédiales des réécritures chansonnières, ainsi que sur l’aspect créatif que celles-ci peuvent acquérir dans des contextes socio-économiques et politiques spécifiques. Mettant en avant la dynamique ininterrompue des circulations de Titine en Europe centrale au XXe siècle, ainsi que le rôle central des intertextes français et américain dans l’élaboration et la réception de ces réécritures, l’article contribue à la mise en cause du caractère étanche et idéologiquement cohérent des constructions identitaires que les cartographies géopolitiques tendent nécessairement à fixer, par-delà les complexités mouvantes des écritures artistiques, y compris dans leur variante aréale
Les revues de sciences sociales à l’ère numérique
Authors: Cohen Évelyne , Goetschel Pascale , Guigonis Sandra , Matard-Bonucci Marie-Anne , Vapné Lisa , Parisot Thomas , Artières Philippe , Capdevila Élisa 
Published: January 2024

La Revue d’Histoire culturelle (XVIIIe-XXIe siècles) invite à penser, à partir d’expériences multiples, les choix éditoriaux (positifs ou par défaut), les contraintes, les stratégies, les publics spécifiques, les modalités de lecture et d’écriture que les revues numériques induisent.
Leptin Receptor Deficiency Impairs Lymph Node Development and Adaptive Immune Response
Authors: Cardani-Boulton Amber , Sung Sun-Sang J , Petri William A , Hahn Young S , Braciale Thomas J 
Published: January 2024

Abstract
Activation and clonal expansion of the Ag-specific adaptive immune response in the draining lymph node is essential to clearing influenza A virus infections. Activation sufficient for virus clearance is dependent on the lymph node’s architectural organization that is maintained by stromal cells, chiefly fibroblastic reticular cells. During an analysis of influenza A virus clearance in leptin receptor knockout (DB/DB) mice, we observed that the DB/DB mice have markedly reduced numbers of lymph node fibroblastic reticular cells at the steady state. The reduction in lymph node fibroblastic reticular cells resulted in abnormal lymph node organization and diminished numbers of adaptive immune cells in the lymph nodes under homeostatic conditions. As a consequence, the DB/DB mice were impaired in their ability to generate an effective influenza-specific adaptive immune response, which prevented virus clearance. Using leptin receptor mutant mice with point mutations at distinct signaling sites in the leptin receptor, we were able to link the leptin receptor’s signaling domain tyrosine 985, which does not contribute to obesity, to lymph node fibroblastic reticular cell development and function. These results demonstrate a novel role for leptin receptor signaling in regulating lymph node development in a manner that is crucial to the generation of Ag-specific adaptive immune responses.
Cutting Edge: Cytosolic Receptor AIM2 Is Induced by Peroxisome Proliferator-activated Receptor γ following Mycobacterium tuberculosis Infection of Human Macrophages but Does Not Contribute to IL-1β Release
Authors: Arnett Eusondia , Wolff Jade , Leopold Wager Chrissy M , Simper Jan , Badrak Jeanine L , Ontiveros Carlos O , Ni Bin , Schlesinger Larry S 
Published: January 2024

Abstract
AIM2 (absent in melanoma 2), an inflammasome component, mediates IL-1β release in murine macrophages and cell lines. AIM2 and IL-1β contribute to murine control of Mycobacterium tuberculosis (M.tb) infection, but AIM2’s impact in human macrophages, the primary niche for M.tb, remains unclear. We show that M.tb, Mycobacterium bovis bacillus Calmette–Guérin (BCG), and M. smegmatis induce AIM2 expression in primary human macrophages. M.tb-induced AIM2 expression is peroxisome proliferator-activated receptor γ (PPARγ)–dependent and M.tb ESX-1–independent, whereas BCG- and M. smegmatis–induced AIM2 expression is PPARγ-independent. PPARγ and NLRP3, but not AIM2, are important for IL-1β release in response to M.tb, and NLRP3 colocalizes with M.tb. This is in contrast to the role for AIM2 in inflammasome activation in mice and peritoneal macrophages. Altogether, we show that mycobacteria induce AIM2 expression in primary human macrophages, but AIM2 does not contribute to IL-1β release during M.tb infection, providing further evidence that AIM2 expression and function are regulated in a cell- and/or species-specific manner.
Foliations whose first Chern class is nef
Authors: Ou Wenhao 
Published: January 2024

Let

\mathcal{F}

be a foliation on a projective manifold

X

with

-K_{\mathcal{F}}

nef. Assume that either

\mathcal{F}

is regular, or it has a compact leaf. We prove that there is a locally trivial fibration

f\colon X\to Y

and a foliation

\mathcal{G}

on

Y

with

K_{\mathcal{G}}\equiv 0

such that

\mathcal{F} = f^{-1}\mathcal{G}

.
Soundness of Female Teacher’s Dress Code Policy in Sri Lanka
Authors: Rathnayake Prabodha , Jayasinghe Chamarie 
Published: January 2024

Clothing plays a crucial role in any society as an indicator to reflects the personality, culture, subcultures, religions, occupations, and moral values of individuals. The debate between formal and informal dress code in labor market is being a serious deliberation to many scholars. Especially, teachers are subjected to such discussions, because a teacher is considered to be a role model to students. In addition, the dress of teachers may have different implications than other professions. Since, the dress code replicates the set of principles in an organization comprising with the professionalism, such policies should be more important and proactive. Recently, different parties in Sri Lanka confronted with controversial ideas regarding female teacher’s dress code. However, the existing policies were not reformed and not considerably measured the relationship between job performance and employee attire by relevant authorities in Sri Lanka. Thus, to examine the soundness of prevailing dress code policy, the study is surveyed the positive and negative impacts of job performance that female teachers encounter due to dress code policy in Sri Lanka. Further, the study identified certain best practices that could imply to modernize the existing traditional dress code policies. The study was carried out as a qualitative study using in-depth interviews with individuals and group discussions. Fifteen participants were selected as the sample based on judgmental sampling method while thematic analysis was used to analyze the collected data. Based on the results of interviews, three themes were discussed as the outcomes of the study including effect of attire on professionalism, school culture and professional attire, and the challenges of wearing professional attire. The study emphasized the importance of adjusting existing dress code policy for female teachers in Sri Lanka by adhering the challenges on job performance by the attire.