bluuebunny/crossref_metadata_2025_split huggingface dataset:
Static Thin Disks with Power-law Density Profiles
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Authors: Kotlařík P. , Kofroň D. , Semerák O. 
Published: June 2022

Abstract
The task of finding the potential of a thin circular disk with power-law radial density profile is revisited. The result, given in terms of infinite Legendre-type series in the above reference, has now been obtained in closed form thanks to the method of Conway employing Bessel functions. Starting from a closed-form expression for the potential generated by the elementary density term ρ
2l
, we cover more generic—finite solid or infinite annular—thin disks using superposition and/or inversion with respect to the rim. We check several specific cases against the series-expansion form by numerical evaluation at particular locations. Finally, we add a method to obtain a closed-form solution for finite annular disks whose density is of “bump” radial shape, as modeled by a suitable combination of several powers of radius. Density and azimuthal pressure of the disks are illustrated on several plots, together with radial profiles of free circular velocity.
Birthplaces of Extreme Ultraviolet Waves Driven by Impingement of Solar Jets upon Coronal Loops
Authors: Zhang Liang , Zheng Ruisheng , Chen Huadong , Chen Yao 
Published: June 2022

Abstract
Solar extreme ultraviolet (EUV) waves are large-scale propagating disturbances in the corona. It is generally believed that a vital key to the formation of EUV waves is the rapid expansion of the loops that overlie erupting cores in solar eruptions, such as coronal mass ejections (CMEs) and solar jets. However, the details of the interaction between the erupting cores and overlying loops are not clear because the overlying loops always instantly open after energetic eruptions. Here, we present three typical jet-driven EUV waves without CMEs to study the interaction between the jets and the overlying loops that remained closed during the events. All three jets emanated from magnetic flux cancellation sites in the source regions. Interestingly, after the interactions between the jets and overlying loops, three EUV waves respectively formed ahead of the top, the near end (close to the jet source), and the far (another) end of the overlying loops. According to the magnetic field distribution of the loops extrapolated through the potential field source surface method, it is confirmed that the birthplaces of three jet-driven EUV waves were around the parts of the overlying loops with the weakest magnetic field strengths. We suggest that the jet-driven EUV waves preferentially occur at the weakest part of the overlying loops, and the location can be subject to the magnetic field intensity around the ends of the loops.
Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. II. Elemental Abundances
Authors: Li Haining , Aoki Wako , Matsuno Tadafumi , Xing Qianfan , Suda Takuma , Tominaga Nozomu , Chen Yuqin , Honda Satoshi , Ishigaki Miho N. , Shi Jianrong , Zhao Jingkun , Zhao Gang 
Published: June 2022

Abstract
We present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 363 new objects) studied by a single program, and the first attempt to accurately determine evolutionary stages for such a large sample based on Gaia parallaxes. The sample covers a wide metallicity range from [Fe/H] ≲ −1.7 down to [Fe/H] ∼ −4.3, including over 110 objects with [Fe/H] ≤ −3.0. The expanded coverage in evolutionary status makes it possible to define the abundance trends respectively for giants and turnoff stars. The newly obtained abundance data confirm most abundance trends found by previous studies, but also provide useful updates and new samples of outliers. The Li plateau is seen in main-sequence turnoff stars with −2.5 < [Fe/H] < −1.7 in our sample, whereas the average Li abundance is clearly lower at lower metallicity. Mg, Si, and Ca are overabundant with respect to Fe, showing decreasing trend with increasing metallicity. Comparisons with chemical evolution models indicate that the overabundance of Ti, Sc, and Co are not well reproduced by current theoretical predictions. Correlations are seen between Sc and α-elements, while Zn shows a detectable correlation only with Ti but not with other α-elements. The fraction of carbon-enhanced stars ([C/Fe] > 0.7) is in the range of 20%–30% for turnoff stars depending on the treatment of objects for which C abundance is not determined, which is much higher than that in giants (∼8%). Twelve Mg-poor stars ([Mg/Fe] < 0.0) have been identified in a wide metallicity range from [Fe/H] ∼ −3.8 through −1.7. Twelve Eu-rich stars ([Eu/Fe] > 1.0) have been discovered in −3.4 < [Fe/H] < −2.0, enlarging the sample of r-process-enhanced stars with relatively high metallicity.
Comets in Context: Comparing Comet Compositions with Protosolar Nebula Models
Authors: Willacy Karen , Turner Neal , Bonev Boncho , Gibb Erika , Dello Russo Neil , DiSanti Michael , Vervack Jr. Ronald J. , Roth Nathan X. 
Published: June 2022

Abstract
Comets provide a valuable window into the chemical and physical conditions at the time of their formation in the young solar system. We seek insights into where and when these objects formed by comparing the range of abundances observed for nine molecules and their average values across a sample of 29 comets to the predicted midplane ice abundances from models of the protosolar nebula. Our fiducial model, where ices are inherited from the interstellar medium, can account for the observed mixing ratio ranges of each molecule considered, but no single location or time reproduces the abundances of all molecules simultaneously. This suggests that each comet consists of material processed under a range of conditions. In contrast, a model where the initial composition of disk material is “reset,” wiping out any previous chemical history, cannot account for the complete range of abundances observed in comets. Using toy models that combine material processed under different thermal conditions, we find that a combination of warm (CO-poor) and cold (CO-rich) material is required to account for both the average properties of the Jupiter-family and Oort cloud comets, and the individual comets we consider. This could occur by the transport (either radial or vertical) of ice-coated dust grains in the early solar system. Comparison of the models to the average Jupiter-family and Oort cloud comet compositions suggests the two families formed in overlapping regions of the disk, in agreement with the findings of A’Hearn et al. and with the predictions of the Nice model.
The Host Galaxy of the Recoiling Black Hole Candidate in 3C 186: An Old Major Merger Remnant at the Center of a z = 1 Cluster
Authors: Morishita T. , Chiaberge M. , Hilbert B. , Lambrides E. , Blecha L. , Baum S. , Bianchi S. , Capetti A. , Castignani G. , Macchetto F. D. , Miley G. K. , O’Dea C. P. , Norman C. A. 
Published: June 2022

Abstract
3C 186, a radio-loud quasar at z = 1.0685, was previously reported to have both velocity and spatial offsets from its host galaxy, and has been considered as a promising candidate for a gravitational wave recoiling black hole triggered by a black hole merger. Another possible scenario is that 3C 186 is in an ongoing galaxy merger, exhibiting a temporary displacement. In this study, we present analyses of new deep images from the Hubble Space Telescope WFC3-IR and Advanced Camera for Surveys, aiming to characterize the host galaxy and test this alternative scenario. We carefully measure the light-weighted center of the host and reveal a significant spatial offset from the quasar core (11.1 ± 0.1 kpc). The direction of the confirmed offset aligns almost perpendicularly to the radio jet. We do not find evidence of a recent merger, such as a young starburst in disturbed outskirts, but only marginal light concentration in F160W at ∼30 kpc. The host consists of mature (≳200 Myr) stellar populations and one compact star-forming region. We compare with hydrodynamical simulations and find that those observed features are consistently seen in late-stage merger remnants. Taken together, those pieces of evidence indicate that the system is not an ongoing/young merger remnant, suggesting that the recoiling black hole scenario is still a plausible explanation for the puzzling nature of 3C 186.
KLLR: A Scale-dependent, Multivariate Model Class for Regression Analysis
Authors: Farahi Arya , Anbajagane Dhayaa , Evrard August E. 
Published: June 2022

Abstract
The underlying physics of astronomical systems govern the relation between their measurable properties. Consequently, quantifying the statistical relationships between system-level observable properties of a population offers insights into the astrophysical drivers of that class of systems. While purely linear models capture behavior over a limited range of system scale, the fact that astrophysics is ultimately scale dependent implies the need for a more flexible approach to describing population statistics over a wide dynamic range. For such applications, we introduce and implement a class of kernel localized linear regression (KLLR) models. KLLR is a natural extension to the commonly used linear models that allows the parameters of the linear model—normalization, slope, and covariance matrix—to be scale dependent. KLLR performs inference in two steps: (1) it estimates the mean relation between a set of independent variables and a dependent variable and; (2) it estimates the conditional covariance of the dependent variables given a set of independent variables. We demonstrate the model's performance in a simulated setting and showcase an application of the proposed model in analyzing the baryonic content of dark matter halos. As a part of this work, we publicly release a Python implementation of the KLLR method.
Rapport intermédiaire : les arts du spectacle indépendants entre consolidation institutionnelle et précarité – une perspective comparative européenne
Authors: Eder Thomas Fabian , Georget Jean-Louis 
Published: June 2022

Les arts du spectacle indépendants sont en train de s’ancrer comme un champ organisationnel opérant sur tout le continent européen. Une analyse comparative à l’échelle européenne se concentrant sur les caractéristiques structurelles qui définissent institutionnellement ce domaine n’a pas encore été produite. Le présent document vise à inspirer la discussion. Il accorde une place prépondérante aux conditions socio-économiques du secteur, compte tenu notamment des nouveaux défis posés par la pandémie de coronavirus. Ensuite, les mesures prises par les associations de défense des arts du spectacle pour améliorer le statut précaire des artistes illustreront le développement de la conscience mutuelle, les modèles de coalition internationale et l’alignement isomorphique dans la structuration du domaine au-delà des frontières des États-nations. Enfin, les réalisations en matière de gouvernance culturelle, et donc l’interaction constructive entre l’État et les organisations de défense des droits pour relever les défis posés, sont présentées. La recherche est basée sur 1 031 réponses à une enquête menée auprès de professionnels de la culture ainsi que sur des entretiens d’experts avec la direction d’organisations indépendantes de défense des arts du spectacle de douze pays européens.
Christian Chartier, un catalyseur de la Formation Professionnelle Continue bordelaise (1977-2002)
Authors: Claverie Éric 
Published: June 2022

L’article relate la transformation historique de la Formation Professionnelle Continue des enseignants d’EPS de l’académie de Bordeaux, de la fin des années 1970 à l’orée du XXI e siècle. Elle est appréciée à l’aune de la trajectoire de l’acteur chargé de son déploiement, et de la revue professionnelle dédiée ayant accompagné son action. Après une brève biographie du personnage et une mise en contexte exposant l’état de la Formation Continue des enseignants d’EPS à sa prise de fonction, l’étude explore les changements à l’œuvre, tant dans les actions de formation impulsées que dans les orientations éditoriales de la revue idoine. Par la suite, la réflexion resitue l’action du personnage au regard d’une phase de transition de la discipline EPS du champ sportif, dont elle est encore largement tributaire, vers celui du monde scolaire. Par l’habileté et l’étendue du réseau de l’acteur, elle montre que l’hypothèse de l’initiative individuelle dans le changement historique peut se révéler porteuse de sens dans certaines circonstances.
Science Teaching Approach Ethno-SETSaR to improve pre-service teachers’ creative thinking and problem solving skills
Authors: Winarto Winarto , Cahyono Edy , Sumarni Woro , Sulhadi Sulhadi , Wahyuni Siti , Sarwi Sarwi 
Published: June 2022

Pre-service teachers need creative thinking and problem solving skills to support their teaching quality. The aims of this research: (1) problems in science teaching, creative thinking and problem solving skills of pre-service teachers; (2) improvements of creative thinking and problem solving skills of pre-service teachers through Ethno-SETSaR Science Teaching Approach, and (3) relationship pattern of critical thinking and problem solving skills. The research method applied in this study was sequential exploratory mix method. The research design consisted of five stages: 1) qualitative data gathering; 2) qualitative data analysis; 3) quantitative data gathering; 4) quantitative data analysis and 5) data interpretation. The subjects of this research were 80 pre-service teachers from two universities. The research instruments were essay tests of creative and problem solving skills. The data analysis used was independent T Test. It could be concluded from qualitative study that science teaching practice was still oriented on content knowledge mastery. It did not improve creative thinking and problem solving skills. Science teaching with Ethno-SETSaR approach was applied as foundation to quantitative study. The result of quantitative study was there was difference in creative thinking and problem solving skills of pre-service teachers. The pre-service teachers enrolling science teaching with Ethno-SETSaR approach had higher scores. There was correlation of creative thinking affecting problem solving skills.
Developing Student Creative Problem-Solving Skills (CPSS) Using Online Digital Storytelling
Authors: Khamcharoen Nipaporn , Kantathanawat Thiyaporn , Sukkamart Aukkapong 
Published: June 2022

This study set out to research and evaluate the needs in developing creative problem-solving skills (CPSS) of undergraduate students through developing and evaluating a digital storytelling process using Padlet. The sampling process used simple random sampling to select 332 teachers from 83 schools in Bangkok. The data was collected using a needs assessment questionnaire, training course questionnaire, and satisfaction questionnaire. Descriptive statistics used for the analysis included frequency, percentage, mean ( , and standard deviation (SD). The data collected were mean scores of expert validity testing and student inter-rater reliability testing. The assessment evaluated student satisfaction toward the CPSS training course using 30 students in the Computer Education Program at Dhonburi Rajabhat University's Faculty of Education in Thailand. The findings revealed that of the four aspects identified for developing undergraduate CPSS, elaboration was at the top of the priority of needs (PNIModified = 0.20). This was followed by originality and flexibility (PNIModified = 0.19). Finally, was fluency (PNIModified = 0.18). Also, analysis of the prospective condition was ranked ‘high’ across all four aspects with an average of = 4.38 SD = 0.06. Further analysis of the real condition showed that all four aspects had an average of = 3.67, SD = 0.06. The study contributes to the literature in that it demonstrated that correctly developed and implemented undergraduate student CPSS can increase significantly. This fact is critical in knowing as a nation’s future depends on its workforce and leaders having CPSS.
Contextual Based E-learning (CBE): A New Model for Online Teaching in Public Health Department for Learning During the Covid-19 Pandemic
Authors: Reno Renaldi  , Aldiga Rienarti Abidin  , Irawan Yuda , Abdurrahman Hamid  , Rizky Ema Wulansari  
Published: June 2022

In order to to support physical distancing activities in the teaching and learning process during the Covid-19 pandemic, an appropriate and effective learning model to fit the learning objectives must be developed. The CBE (Contextual Based on E-learning) learning model, developed from the Contextual Teaching Learning (CTL) model, was integrated with e-learning. This CTL learning model was chosen because this model is an innovative learning model where the process can assist students to connect learning with the context of their lives. This study aims to describe the model's effectiveness which was measured based on three aspects, namely: a) significant difference between students’ achievement in CBE model compared to that in traditional model; b) The effectiveness of CBE syntax in learning; c) Students’ perception on the new CBE model. This study is quantitative research with quasi experimental method. The results of the CBE model showed that the CBE model is significantly effective in improving students' abilities. Therefore, it can be concluded that the CBE model is proven to be effective to be implemented as new teaching model in online learning. The implication of this research is to contribute to new existing knowledge for education, and computer science and to add references to new online-based models. The limitation of this research is the effectiveness of this model described the cognitive knowledge trough students’ learning outcomes.
Knowledge and awareness on deceased donor skin harvest among intensive care units' staffs in national hospital of Sri Lanka
Authors: Kanesu Sivasuganthan , Ekanayake Gayan 
Published: June 2022

Introduction:
Skin coverage is a greatest challenge in severe burns when the donor sites are limited. Early skin cover is important to reduce morbidity and mortality in severe burns. We use to harvest skin from cadavers at intensive care units (ICUs) for temporary cover of excised burn wounds. As we do not get enough cadaveric donations from ICUs, we plan to conduct this study to identify awareness and knowledge on it.

Methods:
We collected data from doctors and nurses working in surgical ICUs (general surgical, accident and emergency, and neurosurgical) by a self-administered questionnaire. Then, we analyzed the results by SPSS 19 data package.

Results:
One hundred and forty participants responded to our questionnaire including 118 nurses and 22 doctors. Only 40% (n = 48) of nurses and 60% (n = 13) of doctors were aware about cadaveric skin donation. Only 31% (n = 44) knew that tissue or blood matching is not needed for it. 88% (n = 124) knew that graft is mainly taken from thighs. Some responded as skin of the patients with comorbidities cannot be used for the transplant. Twelve percent (n = 18) knew whom to contact when the patient for cadaveric skin transplant is identified. Only 17% (n = 24) thinks that it does not cause much disfigurement to the cadaver. Thirteen percent (n = 18) did not know any details about skin donation.

Conclusion:
There is a knowledge deficit in ICU staffs regarding awareness and knowledge on cadaveric skin harvest. We could not compare the doctors and nurses as there were less participants in doctors. In ICUs, an awareness campaign is required. In future, this concept should be assessed in general public as well.
Treatment delayed is treatment denied
Authors: Vardhan Harsha , Lodhi Vishal , Mishra Brijesh , Upadhyay Divya Narayan , Kumar Vijay , Singh Sandesh 
Published: June 2022

Background:
The primary care of a burn victim focuses on the resuscitation. The burns wound draws the attention, with interest of the provider as well as the patient waning after the healing of the wound. “Late burn care” is an important part of burns management that, if delayed, results in the formation of contractures. Simple methods suh as early skin grafting, splintage, and physical therapy prevent the development of these debilitating contractures. Despite this, postburns contractures are a common sequelae.

Aims and Objectives:
The aim of this paper is to identify the lacunae in late primary care, provided to patients presenting to us with postburn contractures. Materials: A review of all patients admitted with postburns contractures from January 2016 to December 2018, was done.

Results:
A total of 427 patients were admitted in this period out of which 254 responded for the interviews. The epidemiology of postburn contractures has been described. The lacunae in late primary burn care have been identified.

Conclusion:
Critical contracture areas are areas, which although innocuous in terms of body surface area burnt, have a high propensity to form contractures and require special care. Public health programs, effective in combating diseases like polio and tuberculosis, can also help preventing burn contractures. Spreading awareness about the basic tenets of contracture prevention will drastically reduce the burden of burn contractures.
Risk factors for hypercoagulability after laparoscopic hepatic haemangioma resection
Authors: Mei Mingqiang , Shi Hao , Cheng Yonglang , Fu Wenguang 
Published: June 2022

Background:
Laparoscopic hepatectomy with a small incision, light abdominal wall trauma and rapid postoperative recovery has been widely used in the surgical treatment of benign liver diseases. However, the occurrence of complications, such as deep-vein thrombosis, associated with laparoscopic techniques has raised concerns. This study aimed to investigate the factors influencing the development of a hypercoagulable state in patients following laparoscopic hepatic haemangioma resection.

Materials and Methods:
Between 2017 and 2019, 78 patients to be treated by laparoscopic hepatic haemangioma resection were selected prospectively for the study. The differences in relevant clinical factors between patients with and without blood hypercoagulability at 24 h after surgery were compared, and the factors influencing the development of blood hypercoagulability after surgery were analysed.

Results:
The study included 78 patients, split into the hypercoagulable group (n = 27) and nonhypercoagulable group (n = 51). Compared with patients who did not develop blood hypercoagulability, patients who did had significantly higher preoperative levels of fibrinogen (Fib), D-dimer (D-Di), fibrinogen degradation products (FDP), platelet count (PLT), low-density lipoprotein cholesterol (LDL-C) and history of hyperlipidaemia whereas high-density lipoprotein cholesterol (HDL-C) levels were significantly lower (P < 0.05.) in hypercoagulable group. Univariate and multifactorial logistic regression analyses showed that a history of hyperlipidaemia, Fib ≥3.83 g/L, D-Di ≥9.12 μg/ml, FDP ≥14.64 μg/ml, PLT ≥292 × 109/L, HDL-C ≥1.25 mmol/L and LDL-C ≥2.03 mmol/L was the most common independent risk factors for the development of a hypercoagulable state of blood in patients after laparoscopic hepatic haemangioma resection (P < 0.05).

Conclusion:
For patients undergoing laparoscopic hepatic haemangioma resection, attention should be paid to the development of a hypercoagulable state in those with the risk factors described in this study.