bluuebunny/crossref_metadata_2025_split huggingface dataset:
Helium-deficient ER UMa-type Dwarf Nova below the Period Minimum with a Hot Secondary
Authors: Lee Youngdae , Moon Dae-Sik , Kim Sang Chul , Park Hong Soo , Ni Yuan Qi 
Published: March 2024

Abstract
We present the discovery of a peculiar dwarf nova KSP-OT-201712a using high-cadence, multicolor observations made with the Korea Microlensing Telescope Network. KSP-OT-201712a exhibits a rare presence of outbursts during standstills, as well as strong Hα emission for a dwarf nova below the period minimum with an orbital period of 58.75 ± 0.02 minutes. The outburst cycles are ∼6.6 days within standstills but increase to ∼15 days outside of them. Both B − V and V − I colors become bluer and redder as the outburst luminosities increase and decrease, respectively, for the outburst within standstill, while they evolve in the opposite directions outside of the standstills. The presence of strong double-peaked Hα and weak He i emission lines with He/H flux ratio of 0.27, together with absorption lines of Mg b and Na D in the source, leads to the estimation T
eff ≃ 4570 ± 40 K, [Fe/H] ≃ 0.06 ± 0.15 dex, and log g ≃ 4.5 ± 0.1 for its secondary. KSP-OT-201712a is the second He-deficient dwarf nova below the period minimum, while the temperature of the secondary is measured for the first time in such objects. We identify it to be an ER UMa-type dwarf nova, suggesting that the evolution of dwarf novae across the period minimum is accompanied by large mass transfers. The high temperature of the secondary indicates that the system started its mass transfer when the secondary was about 93% of its main-sequence age. The system will evolve to a helium cataclysmic variable or to AM CVn once its hydrogen envelope is exhausted before it explodes as a Type Ia supernova.
Multiple Peaks and a Long Precursor in the Type IIn Supernova 2021qqp: An Energetic Explosion in a Complex Circumstellar Environment
Authors: Hiramatsu Daichi , Matsumoto Tatsuya , Berger Edo , Ransome Conor , Villar V. Ashley , Gomez Sebastian , Cendes Yvette , De Kishalay , Bostroem K. Azalee , Farah Joseph , Howell D. Andrew , McCully Curtis , Newsome Megan , Padilla Gonzalez Estefania , Pellegrino Craig , Suzuki Akihiro , Terreran Giacomo 
Published: March 2024

Abstract
We present optical photometry and spectroscopy of the Type IIn supernova (SN) 2021qqp. Its unusual light curve is marked by a long precursor for ≈300 days, a rapid increase in brightness for ≈60 days, and then a sharp increase of ≈1.6 mag in only a few days to a first peak of M

r
≈ −19.5 mag. The light curve then declines rapidly until it rebrightens to a second distinct peak of M

r
≈ −17.3 mag centered at ≈335 days after the first peak. The spectra are dominated by Balmer lines with a complex morphology, including a narrow component with a width of ≈1300 km s−1 (first peak) and ≈2500 km s−1 (second peak) that we associate with the circumstellar medium (CSM) and a P Cygni component with an absorption velocity of ≈8500 km s−1 (first peak) and ≈5600 km s−1 (second peak) that we associate with the SN–CSM interaction shell. Using the luminosity and velocity evolution, we construct a flexible analytical model, finding two significant mass-loss episodes with peak mass loss rates of ≈10 and ≈5 M
⊙ yr−1 about 0.8 and 2 yr before explosion, respectively, with a total CSM mass of ≈2–4 M
⊙. We show that the most recent mass-loss episode could explain the precursor for the year preceding the explosion. The SN ejecta mass is constrained to be ≈5–30 M
⊙ for an explosion energy of ≈(3–10) × 1051 erg. We discuss eruptive massive stars (luminous blue variable, pulsational pair instability) and an extreme stellar merger with a compact object as possible progenitor channels.
Impact of Overlapping Signals on Parameterized Post-Newtonian Coefficients in Tests of Gravity
Authors: Dang Yixuan , Wang Ziming , Liang Dicong , Shao Lijing 
Published: March 2024

Abstract
Gravitational waves have been instrumental in providing deep insights into the nature of gravity. Next-generation detectors, such as the Einstein Telescope, are predicted to have a higher detection rate given the increased sensitivity and lower cutoff frequency. However, this increased sensitivity raises challenges concerning parameter estimation due to the foreseeable overlap of signals from multiple sources. Overlapping signals (OSs), if not properly identified, may introduce biases in estimating post-Newtonian (PN) coefficients in parameterized tests of general relativity (GR). We investigate how OSs affect −1PN to 2PN terms in parameterized GR tests, examining their potential to falsely suggest GR deviations. We estimate the prevalence of such misleading signals in next-generation detectors, and their collective influence on GR tests. We compare the effects of OSs on coefficients at different PN orders, concluding that overall the 1PN coefficient suffers the most. Our findings also reveal that while a nonnegligible portion of OSs exhibit biases in PN coefficients that might individually prefer to conclude deviations from GR, collectively, the direction to deviate is random and a statistical combination will still be in favor of GR.
Global Impact of Emerging Internetwork Fields on the Low Solar Atmosphere
Authors: Gošić M. , De Pontieu B. , Sainz Dalda A. 
Published: March 2024

Abstract
Small-scale, newly emerging internetwork (IN) magnetic fields are considered a viable source of energy and mass for the solar chromosphere and possibly the corona. Multiple studies show that single events of flux emergence can indeed locally heat the low solar atmosphere through interactions of the upward propagating magnetic loops and the preexisting ambient field lines. However, the global impact of the newly emerging IN fields on the solar atmosphere is still unknown. In this paper, we study the spatiotemporal evolution of IN bipolar flux features and analyze their impact on the energetics and dynamics of the quiet-Sun atmosphere. We use high-resolution, multiwavelength, coordinated observations obtained with the Interface Region Imaging Spectrograph, Hinode, and the Solar Dynamics Observatory to identify emerging IN magnetic fields and follow their evolution. Our observational results suggest that only the largest IN bipoles are capable of heating locally the low solar atmosphere, while the global contribution of these bipoles appears to be marginal. However, the total number of bipoles detected and their impact estimated in this work is limited by the sensitivity level, spatial resolution, and duration of our observations. To detect smaller and weaker IN fields that would maintain the basal flux, and examine their contribution to the chromospheric heating, we will need higher resolution, higher sensitivity, and longer time series obtained with current and next-generation ground- and space-based telescopes.
Episodic Energy Release during the Main and Post-impulsive Phases of a Solar Flare
Authors: Wei Yuqian , Chen 陈 Bin 彬 , Yu 余 Sijie 思捷 , Wang Haimin , Zhang Yixian , Glesener Lindsay 
Published: March 2024

Abstract
When and where the magnetic field energy is released and converted in eruptive solar flares remains an outstanding topic in solar physics. To shed light on this question, here we report multiwavelength observations of a C9.4-class eruptive limb flare that occurred on 2017 August 20. The flare, accompanied by a magnetic flux rope eruption and a white light coronal mass ejection, features three post-impulsive X-ray and microwave bursts immediately following its main impulsive phase. For each burst, both microwave and X-ray imaging suggest that the nonthermal electrons are located in the above-the-loop-top region. Interestingly, contrary to many other flares, the peak flux of the three post-impulsive microwave and X-ray bursts shows an increase for later bursts. Spectral analysis reveals that the sources have a hardening spectral index, suggesting a more efficient electron acceleration into the later post-impulsive bursts. We observe a positive correlation between the acceleration of the magnetic flux rope and the nonthermal energy release during the post-impulsive bursts in the same event. Intriguingly, different from some other eruptive events, this correlation does not hold for the main impulse phase of this event, which we interpret as energy release due to the tether-cutting reconnection before the primary flux rope acceleration occurs. In addition, using footpoint brightenings at conjugate flare ribbons, a weakening reconnection guide field is inferred, which may also contribute to the hardening of the nonthermal electrons during the post-impulsive phase.
The Recurrent Nova V745 Sco had a Classical Nova Eruption in 1897 July
Authors: Schaefer Bradley E. 
Published: March 2024

Abstract
Recurrent nova V745 Sco is discovered to have a long-lost nova eruption in 1897 July. Now with four known eruptions (in 1897, 1937, 1989, and 2014), plus two likely missed eruptions (around 1917 and 1963), the average recurrence time is 23 yr, with a fractional rms of 13%.
Pre-impact Albedo Map and Photometric Properties of the (65803) Didymos Asteroid Binary System from DART and Ground-based Data
Authors: Buratti B. J. , Pittichová J. , Mishra I. , Hillier J. K. , Mosher J. A. , Chesley S. R. , Sunshine J. M. , Barnouin O. , Ernst C. M. , Daly R. T. , Li J-Y , Cheng A. F. , Rivkin A. S. , Rizos J. 
Published: March 2024

Abstract
This study provides a pre-impact map of the albedo of the Double Asteroid Redirection Test (DART) target Dimorphos corrected for all the effects of viewing geometry, as well as an estimate of photometric roughness for the hemisphere imaged by DART. Other photometric properties are derived for the (65803) Didymos binary system based on DART and ground-based measurements obtained at JPL’s Table Mountain Observatory. The roughness, geometric albedo, phase curve and phase integral, and single particle phase function are typical of the S-family of asteroids. The major remaining uncertainty lies in the behavior of the phase curve below 7°. These results provide a baseline for comparison with Hera measurements, leading to an understanding of the quantitative effects of the kinetic impactor mitigation strategy.
La formation continue saisie par le droit
Authors: Caillaud Pascal , Luttringer Jean-Marie 
Published: March 2024

Comme tout corpus juridique, le droit de la formation professionnelle continue se caractérise par des normes, des institutions, des prérogatives et des obligations particulières, fruits d’une évolution historique donnée. La formation continue obéit ainsi à un régime juridique aux sources éclatées, donnant une place singulière aux partenaires sociaux, tout en étant soumis au pouvoir créateur des juges. Saisie par la législation comme un objet juridique particulier, elle s’accompagne d’un droit à l’information, au conseil et à l’orientation professionnelle pour le bénéficiaire, en activité comme en recherche d’emploi. Son accès dans l’entreprise s’organise entre libertés et obligations pour l’employeur et le salarié, dans un écosystème institutionnel soumis aux enjeux de financement. Enfin, sa reconnaissance soulève des problématiques de certifications, de classifications et de qualification professionnelles, au cœur des relations professionnelles. À l’aube d’une nouvelle réforme annoncée, les mutations contemporaines de la société conduiront inévitablement à une nouvelle adaptation de ce droit. Acte de liberté, source de responsabilité, objet de garanties collectives et sociales, la formation professionnelle n’a pas fini d’être « saisie » par le droit.
«Союз родства и узы крови» : генеалогия и структура правящей элиты России 1725-1762 гг.
Authors: Chernikov Sergey V. 
Published: March 2024

L’étude des liens de parenté dans l’élite dirigeante de la Russie des années 1725-1762 a permis d’identifier la structure de cette élite : le cercle intérieur, qui représente 40 % (dont 10 % des groupes les plus solidaires), le cercle extérieur (16 %) et la périphérie (44 %). L’analyse montre qu’il existait une très forte corrélation entre la place d’un homme dans le réseau de parenté, sa carrière et sa richesse. En outre, il s’avère que la Table des rangs limitait considérablement la mobilité verticale : le nombre de nouveaux venus rejoignant l’élite dans les années 1725-1762 était deux fois plus faible que dans les années 1613-1689. Elle entretenait le « népotisme » des vieilles familles et favorisait sa diffusion parmi les nouvelles. La Table des rangs était le produit d’une pensée rationnelle, mais l’étroitesse du lien entre les relations de parenté et le service nous permet de remettre en question le point de vue historiographique traditionnel selon lequel le système de promotion créé par Pierre le Grand était fondamentalement différent des pratiques du siècle précédent.
Une radio, quatre langues. Ethnographie d’une radio communautaire en contexte de domination linguistique à Huayacocotla, Veracruz, Mexique
Authors: Sciullo Diane di 
Published: March 2024

Actuellement, le Mexique est un des dix pays du monde à totaliser le plus de langues autochtones parlées. Celles-ci sont toutes en « danger » ou « menacées » de disparition à différents degrés (INALI [Instituto Nacional de Lenguas Indígenas], 2008). C’est dans ce contexte linguicide qu’évolue La Radio Huaya, la plus ancienne radio communautaire et autochtone du Mexique. Située dans la Huasteca du Veracruz où cohabitent différentes communautés ethniques et linguistiques, elle est la seule du pays à diffuser ses programmes en quatre langues : en Otomí, en Náhuatl, en Tepehua et en Espagnol. En se fondant sur l’analyse de données relevées lors d’une enquête de terrain effectué en 2022 cet article vise à comprendre ce qu’il se passe lorsqu'une radio qui diffuse sur « onde libre » décide elle-même du contenu de ses programmes dans des langues comprises uniquement par les minorités ethniques de la Sierra, excluant ainsi l’audience hégémonique hispanophone ? Et à comprendre comment se traduisent les processus d’identification des minorités ethniques aux animateur·ices autochtones ?
Voix et destin : comment la guérilla des FARC a perdu la bataille des ondes en Colombie (2000-2010)
Authors: Roux Clément 
Published: March 2024

Au début du XXIeème siècle, la guérilla marxiste-léniniste des Forces Armées Révolutionnaires de Colombie (FARC) a engagé une bataille radiophonique avec l’armée colombienne. Dans un environnement médiatique hostile, les FARC ont déployé pendant plus d’une décennie la Voix de la résistance, un réseau de stations de radio clandestines dans les zones périphériques qu’elles contrôlaient. Cette étude analyse la genèse, le fonctionnement et l’impact de cette stratégie de propagande insurgée, qui a dû faire face à la contre-offensive victorieuse des stations de radio de l’armée colombienne. Elle met en lumière les succès éphémères et les difficultés rencontrées par la Voix de la résistance, tout en explorant les enjeux et les conséquences de cette « bataille des ondes » asymétrique.
La déségrégation des radios commerciales aux États-Unis
Authors: Coddington Amy 
Published: March 2024

Ce chapitre examine les enjeux de race autour de la programmation radio aux États-Unis en se concentrant sur le développement d’un nouveau format radiophonique à la fin des années 1980. Ce nouveau format, baptisé Crossover par l’industrie radio, a attiré une coalition d’auditeurs Noirs, Blancs et Hispaniques en diffusant des musiques up-tempo dance, R&B et pop. Ce faisant, ce format a remis en question la structure ségréguée de l’industrie de la radio, en prenant en compte la présence et les goûts des auditeurs hispaniques et en commercialisant des audiences jeunes et multiculturelles. Le succès de ce format a inﬂuencé la programmation des stations de radio Top 40, faisant entrer les sons des publics multiculturels dans la musique populaire américaine mainstream. Parmi ces sons figurait le hip hop, que les programmateurs de Crossover ont adopté pour sa capacité à séduire des publics divers ; ces stations ont contribué à faciliter la croissance de ce genre en plein essor. Mais les logiques racialisées de ces stations étaient complexes, car elles refusaient de soutenir les intérêts des minorités ciblées au nom de la colorblindness et de l’inclusion.
La nuit où les postes périphériques firent front commun : une expérience radiophonique en stéréophonie entre RTL et Europe n° 1 à la fin des années 60
Authors: Legay Richard 
Published: March 2024

En mai 1968, les deux grandes stations périphériques francophones des années 60, RTL et Europe n° 1, diffusent, de façon simultanée, une émission de divertissement commune. Cet article est une analyse approfondie d’un enregistrement de cette émission, mis en parallèle avec les archives des stations, qui révèle la complexité du paysage radiophonique français à la fin des années 60 entre compétition et rapprochement des stations commerciales et tensions avec l’ORTF. Cette analyse, qui s’appuie à la fois sur les études sonores et l’histoire des médias, montre que l’émission met en scène le rapprochement entre les stations autant qu’elle y participe, jusque dans le son par l’utilisation de la stéréophonie.
Pyronaridine combined with diminazene aceturate inhibits Babesia in vitro and in vivo
Authors: El-Sayed Shimaa Abd El-Salam , Sayed-Ahmed Mohamed Z. , Ali Shaimaa Ahmed Awad , Alsadaan Nourah , Alam Nawazish , Alkhoudary Mahmoud S. , Igarashi Ikuo , Rizk Mohamed Abdo 
Published: March 2024

Objective:
To evaluate the combination therapy of pyronaridine tetraphosphate and diminazene aceturate against Babesia in vitro and in vivo.

Methods:
Bioinformatic analysis was performed using atom pair fingerprints. An in vitro combination test was performed against Babesia bovis and Theileria equi. Moreover, the in vivo chemotherapeutic efficacy of pyronaridine tetraphosphate in combination with diminazene aceturate was investigated against the growth of Babesia microti in mice using a fluorescence inhibitory assay.

Results:
Pyronaridine tetraphosphate and diminazene aceturate exhibited nearly similar molecular weights. The in vitro combination of pyronaridine tetraphosphate and diminazene aceturate was synergistic on Babesia bovis and additive on Theileria equi. In addition, 5 mg/kg pyronaridine tetraphosphate combined with 10 mg/kg diminazene aceturate inhibited Babesia microti growth significantly compared with those observed after treatment with 25 mg/kg diminazene aceturate alone from day 6 post treatment to day 12 post treatment. The combination therapy also normalized the hematological parameters of infected mice.

Conclusions:
An oral dose of pyronaridine tetraphosphate combined with a subcutaneous dose of diminazene aceturate inhibits Babesia in vitro and in mice, suggesting it might be a new paradigm for the treatment of babesiosis.
Characteristics of hospitalized patients with confirmed COVID-19 and their hospital management
Authors: Indrawati Lely , Tjandrarini Dwi Hapsari , Sulistiyowati Ning , Afifah Tin , Paramita Astridya , Senewe Felly Philipus , Dewantara Pandji Wibawa 
Published: March 2024

Objective:
To determine the risk factors of mortality among hospitalized COVID-19 patients.

Methods:
This retrospective study used hospitalization records collected by the Indonesia Health Social Security Administrator Agency (Badan Penyelenggara Jaminan Sosial Kesehatan-BPJS Kesehatan). A total of 38277 eligible patients with confirmed COVID-19 were analyzed. The dependent variable of the study was the discharge status (death or recovery) of COVID-19. Independent variables were history of morbidity and disease-related occurrence, type of room health facilities, length of stay and demographic variables (sex, age). The analyses use bivariate and multivariate logistic regression to determine the dominating variable associated with all these variables.

Results:
Of the 38 277 inpatients with PCR-confirmed COVID-19, 31051 (81.1%) were discharged and 7226 (18.9%) died. Risk of death was positively associated with older age (aOR 5.74, 95% CI 4.20-7.87 for 19-64 years old; aOR 13.75, 95% CI 9.99-18.92 for 65 years above), male sex (aOR 1.13, 95% CI 1.07-1.19), treated in ICU without ventilator (aOR 5.84, 95% CI 5.41-6.30) and had comorbid respiratory diseases (aOR 5.39, 95% CI 4.93-5.90), but negatively associated with hospital stay of 15 days or longer (aOR 0.39, 95% CI 0.36-0.43).

Conclusions:
COVID-19 related death during hospitalization was associated with duration and type of treatment, and existing medical condition among the inpatient individuals during COVID-19 pandemic in DKI Jakarta. The findings of the study suggest importance of appropriate and timely medical intervention and care.
Epidemic management in a measles outbreak in 2023, the return of vaccine–preventable diseases: A single center, retrospective observational study
Authors: Tuncay Sevgi Aslan , Akkoc Gulsen , Yilmaz Seyhan , Parlak Burcu , Erdemli Pinar Canizci , Isik Aylin Dizi , Aytac Didem Buyuktas , Capar Meryem Cagla Abaci , Kadayifci Eda Kepenekli 
Published: March 2024

Objective:
To investigate the importance of immunization in preventing measles infection and to determine the most useful laboratory tests for confirmation of measles.

Methods:
This study included pediatric cases evaluated with a presumed diagnosis of measles between December 2022 and June 2023, at Marmara University Pendik Training and Research Hospital. The effects of vaccination status and underlying disease on the clinical course, treatments, and complications were evaluated.

Results:
In total, 117 patients were enrolled in the study with a median age of 80 months (IQR: 32.5-125.0). Twelve patients with contact history were asymptomatic and had an underlying disorder, and intravenous immunoglobulin was given to them for post-exposure prophylaxis. Fifty-one patients had confirmed measles diagnosis. Ribavirin treatment was given to three patients (a newborn, a girl with rhabdomyosarcoma, and a healthy boy) with respiratory distress. Seventy-eight percent of confirmed measles cases were unvaccinated, and all hospitalized cases were unvaccinated or under-vaccinated. Four full-vaccinated children had confirmed measles infection. Measles PCR from nasopharyngeal swabs was negative in all of them, and their diagnosis was established with anti-measles IgM positivity.

Conclusions:
The measles vaccine is the most effective way to protect from measles and measles-related complications. Although measles can also occur in fully vaccinated patients, the disease is milder than in unvaccinated patients. Using ELISA and RT-PCR tests together may be beneficial in patients with high clinical suspicion for early diagnosis.