bluuebunny/crossref_metadata_2025_split huggingface dataset:
Revealing the Drag Instability in One-fluid Nonideal Magnetohydrodynamic Simulations of a 1D Isothermal C-shock
Authors: Gu Pin-Gao , Chen Che-Yu , Shen Emma , Yen Chien-Chang , Lin Min-Kai 
Published: August 2022

Abstract
C-type shocks are believed to be ubiquitous in turbulent molecular clouds thanks to ambipolar diffusion. We investigate whether the drag instability in 1D isothermal C-shocks, inferred from the local linear theory of Gu & Chen, can appear in nonideal magnetohydrodynamic simulations. Two C-shock models (with narrow and broad steady-state shock widths) are considered to represent the typical environment of star-forming clouds. The ionization-recombination equilibrium is adopted for the one-fluid approach. In the 1D simulation, the inflow gas is continuously perturbed by a sinusoidal density fluctuation with a constant frequency. The perturbations clearly grow after entering the C-shock region until they start being damped at the transition to the post-shock region. We show that the profiles of a predominant Fourier mode extracted locally from the simulated growing perturbation match those of the growing mode derived from the linear analysis. Moreover, the local growth rate and wave frequency derived from the predominant mode generally agree with those from the linear theory. Therefore, we confirm the presence of the drag instability in simulated 1D isothermal C-shocks. We also explore the nonlinear behavior of the instability by imposing larger-amplitude perturbations to the simulation. We find that the drag instability is subject to wave steepening, leading to saturated perturbation growth. Issues concerning local analysis, nonlinear effects, one-fluid approach, and astrophysical applications are discussed.
A Physical Model for the UV/Optical Power Spectra of AGN
Authors: Panagiotou Christos , Papadakis Iossif , Kara Erin , Kammoun Elias , Dovčiak Michal 
Published: August 2022

Abstract
The UV/optical variability of active galactic nuclei (AGN) has long been thought to be driven by the X-ray illumination of the accretion disk. However, recent multiwavelength campaigns of nearby Seyfert galaxies seem to challenge this paradigm, with an apparent discrepancy between observations and the underlying theory. In order to further probe the connection between the UV/optical and X-ray variability in AGN, we developed a physical model to reproduce the UV/optical power spectral densities (PSDs) of AGN assuming the thermal reprocessing of the X-rays in the disk. This model offers a novel way to probe the innermost regions of AGN. We use our model to study the variability of NGC 5548, and we infer that the X-ray and UV/optical PSDs as well as the interband UV/optical time lags are all well reproduced. We also derive constraints on the source physical parameters, such as the X-ray corona height and the accretion rate. Our results suggest that X-ray disk reprocessing accounts for the full variability properties of this AGN, within the considered timescales. Using earlier data of NGC 5548, we also show that our model can reproduce its PSD in different epochs, establishing the feasibility of using PSD modeling to investigate the time evolution of a source.
A Bayesian Analysis of Physical Parameters for 783 Kepler Close Binaries: Extreme-mass-ratio Systems and a New Mass Ratio versus Period Lower Limit
Authors: Kobulnicky Henry A. , Molnar Lawrence A. , Cook Evan M. , Henderson Lauren E. 
Published: August 2022

Abstract
Contact binary star systems represent the long-lived penultimate phase of binary evolution. Population statistics of their physical parameters inform an understanding of binary evolutionary pathways and end products. We use light curves and new optical spectroscopy to conduct a pilot study of ten (near) contact systems in the long-period (P > 0.5 days) tail of close binaries in the Kepler field. We use PHOEBE light-curve models to compute Bayesian probabilities on five principal system parameters. Mass ratios and third-light contributions measured from spectra agree well with those inferred from the light curves. Pilot study systems have extreme mass ratios q < 0.32. Most are triples. Analysis of the unbiased sample of 783 0.15 d < P < 2 days (near) contact binaries results in 178 probable contact systems, 114 probable detached systems, and 491 ambiguous systems for which we report best-fitting and 16th-/50th-/84th-percentile parameters. Contact systems are rare at periods P > 0.5 days, as are systems with q > 0.8. There exists an empirical mass ratio lower limit

q

min

(
P
)

≈ 0.05–0.15 below which contact systems are absent, supporting a new set of theoretical predictions obtained by modeling the evolution of contact systems under the constraints of mass and angular momentum conservation. Premerger systems should lie at long periods and near this mass ratio lower limit, which rises from q = 0.044 for P = 0.74 days to q = 0.15 at P = 2.0 days. These findings support a scenario whereby nuclear evolution of the primary (more massive) star drives mass transfer to the primary, thus moving systems toward extreme q and larger P until the onset of the Darwin instability at

q

min

precipitates a merger.
A CO Survey of the Entire Northern Sky
Authors: Dame T. M. , Thaddeus P. 
Published: August 2022

Abstract
We present a very large extension of the Galactic plane CO survey of Dame et al. to the entire northern sky (δ > −17°). The extension was carried out with the same telescope as was used for the plane survey, the CfA 1.2 m, and perfectly meshes with its irregular boundaries in latitude. A total of 382,202 CO(1–0) spectra uniformly sample the high-latitude sky with a true-angle spacing of 0.°25 or better. The final reduced and folded spectra have a uniform sensitivity of 0.18 K in 0.65 km s−1 channels and provide a velocity coverage of ±47.1 km s−1. We describe the observational techniques and the data reduction and provide various summary maps of the spatial and velocity distributions of CO emission over the northern sky, and a catalog of the molecular clouds we found there. We also describe the CO spectral line data cubes that we have made available online.
Relationship between the Length of Isolation and Swab Results with Degree of Anxiety and Depression Disorders in Patients with Confirmed of Coronavirus Disease 2019
Authors: Wahyuni Anak Ayu Sri , Ardani Gusti Ayu Indah , Ariani Ni Ketut Putri , Aji Putu Dharma Krisna , Satiadi Marwita Pratama , Yuwono Friska Natalia , Kertiasih Ni Wayan , Sutarta Putu Candra Sasmita , Evilia Wati 
Published: August 2022

Background: The outbreak of Coronavirus Disease 2019 (COVID-19) has increased the burden of psychological stress. This study aims to determine the relationship between the length of isolation, the results of the COVID-19 Polymerase Chain Reaction (PCR) swab test, the time of reporting and the level of knowledge with the degree of depression and anxiety in patients with swab results confirmed by SARS-CoV-2. Methods: This study is an analytical observational study with a cross-sectional design. After the data was collected, a bivariate statistical analysis was carried out for the Kruskal-Wallis and Spearman Test. Results: A total of 25 patients with a diagnosis of COVID-19 were included in this study. Conclusion: study found that the length of isolation, frequency of swab, the time spent focusing on Covid-19 and level of knowledge were not related to the degree of depression and anxiety. However, mental attention and appropriate intervention are an important part of clinical care for those at risk.
A Chunk of Coal
Authors: Khatri Shradha 
Published: August 2022

Introduction:
In December 2019, an outbreak of pneumonia of unknown origin was reported in Wuhan, Hubei Province, China and the World Health Organization declared it as a pandemic on 12 March 2020. The pandemic had devastating repercussions in form of human lives, economy and mental health.

Method
This article brings in light the experiences, expectations and coping mechanisms of the author during raging 30-days duty in a 250 bedded isolated Covid-19 pneumonia ward.

Results
While the world stagnated in the walls of their residence, the health care workers, donning the badge of “Duty to serve”, faced a real-time war against the pandemic with sidelines of stigma, discrimination and mental trauma, in their stride with their heads held high.

Conclusions
The article focuses on helpless, frustrating yet intriguing journey through the experiences encountered in midst of the second wave of the pandemic, ending with a sense of humility, gratitude, resilience and post-traumatic growth.
PROGRAMA MAIS MÉDICOS: CONCEPÇÃO E IMPLEMENTAÇÃO E O PAPEL DA MÍDIA
Authors: Fahel Murilo , Júnior Silvio Ferreira , Costa Luis Felipe Marinho , Freitas Carina Silva de , Santana Nathália Alves 
Published: August 2022

Introdução: O Programa Mais Médicos (PMM) foi um esforço de qualificação da Atenção Primária a Saúde (APS) no Brasil. Den- tre seus eixos, englobavam-se o aumento do número de profissionais médicos na APS e a melhor distribuição destes pelo território nacional, objetivando a redução das desigualdades em saúde. Após aprovado como projeto de lei, sua implementação, em 2013, passou por desafios e conquistas, atrelando-se a opiniões divergentes sobre seus benefícios à saúde do país. Nesse sentido, a mídia teve papel importante, representando a principal fonte informativa e influenciando diretamente no significado que o programa possuiria. Objetivo: O presente estudo tem como objetivo abordar os pontos da concepção e implementação do PMM, bem como a relação deste com o poder midiático da época, analisando a importância da imprensa para a aceitação da população ao programa. Método: Realizou-se revisão bibliográfica que levantou estudos de mídia e de políticas públicas e compilou-se os resultados conforme as etapas do programa. Conclusão: A partir dos resultados, conclui-se que o processo de concepção foi regulamentado e embasado em indica- dores de saúde fidedignos, assim como sua implementação representou melhorias para a APS exercendo a mídia grande influência para o real significado que o programa obteve para a população.
Palavras-Chave: Acesso à informação; Atenção Primária à Saúde; Administração em Saúde Pública
Síndrome de Mayer-Rokitansky-Kuster-Hauser en paciente femenina de 17 años de edad atendida en el Servicio de Gineco-Obstetricia del Hospital de Especialidades Carlos Andrade Marín desde el año 2017
Authors: alazar Robalino Mathías Sebastian , Chavez Revelo David Sebastián , Casares Castellanos Jonathan Antonio , Castro Salinas Alejandro Enrique 
Published: August 2022

El síndrome MRKHS (Mayer-Rokitansky-Kuster-Hauser) se refiere a la aplasia congénita o hipoplasia severa de las estructuras que derivan de los conductos müllerianos, incluyendo los 2/3 superiores de la vagina, el útero y las trompas de Falopio, en algunos casos se pueden presentar alteraciones de las estructuras óseas y renales. Las pacientes presentan cariotipo femenino 46,XX y función ovárica eficiente con desarrollo normal de los caracteres sexuales secundarios. La incidencia del síndrome MRKHS ha sido estimada en 1 caso por cada 4000-5000 recién nacidos femeninos. Es considerado como una condición esporádica que afecta únicamente a las mujeres sin existir una predisposición étnica ni geográfica. Se piensa que el modo de herencia es autosómico dominante con penetrancia incompleta y expresividad variable. El diagnóstico del síndrome se hará a través de una historia clínica detallada, exámenes hormonales que descarten cualquier otro origen de amenorrea, exámenes de imagen que nos permitan diferenciar la anatomía pélvica y la realización de un cariotipo para poder corroborar un genotipo femenino normal 46,XX. Respecto al tratamiento del síndrome, lo que se busca es la formación de una neovagina para poder mejorar la calidad de vida de la paciente. El tratamiento puede basarse en técnicas quirúrgicas o no quirúrgicas como las dilataciones progresivas. (2)
Para un análisis detallado del síndrome, se realiza reporte de un caso clinico de una paciente femenina de 17 años de edad con diagnóstico de MRKHS, atendida en el Servicio de Gíneco-Obstetricia del Hospital de Especialidades Carlos Andrade Marín desde el año 2017.
Enfermedad de membrana hialina o síndrome de dificultad respiratoria en recién nacidos.
Authors: Párraga Llovera Jessica Alejandra 
Published: August 2022

Resumen
El síndrome de dificultad respiratoria (SDR) es un frecuente motivo de ingreso a la unidad de cuidados intensivos neonatales (UCIN). Descrito originalmente como dificultad respiratoria idiopática (iRDS) o enfermedad de la membrana hialina (HMD), debido a la presencia histológica de capas alveolares de fibrina y células necróticas, conforme a lo explicado en the Lancet respiratory medicine en 1953. Más adelante, cambió su nombre al mencionado al inicio de este párrafo, al demostrarse que la causa principal era el déficit de surfactante (1).
El surfactante se ubica en el pulmón de los mamíferos, cuya principal función es disminuir la tensión superficial de los alvéolos, con el fin de impedir la atelectasia pulmonar. En 1959, en el Hospital Johns Hopkins, los doctores Mary Ellen Avery y Jere Mead, sobre la base de los estudios de Clements, declararon que el colapso alveolar difuso hallado en la enfermedad de la membrana hialina, se produce por la ausencia de la actividad tensioactiva (2). Posteriormente, Fujiwara en 1980 obtuvo excelentes resultados en estudios en animales, donde utilizó un surfactante de origen bovino para e tratamiento de el SDR por vía intratraqueal. Más adelante, Morley y Bangham (1988), usaron por primera vez un surfactante artificial (ALEC) en pacientes con el síndrome (3)
THE CORRELATION BETWEEN HIGH SCHOOL STUDENTS’ PHONOLOGICAL AWARENESS AND THEIR PRONUNCIATION OF ENGLISH INFLECTIONAL MORPHEMES –ED AND -S: A CASE IN THE MEKONG DELTA OF VIETNAM
Authors: Bui Minh Chau , Nguyen Tien Quang 
Published: August 2022

This study examined the relationship between high school students' phonological awareness and their performance in pronouncing allomorphs of English inflectional morphemes -ed and -s. The study involved 31 high school students in Can Tho City in the Mekong Delta of Vietnam. Data of the study were collected through a pronunciation written test (PWT) and a pronunciation oral test (POT). The findings pointed out that all the students had phonological knowledge of the two morphemes; however, the majority of the participants made errors in pronouncing them which indicated their lack of pronunciation performance. In addition, there was no correlation between the students’ phonological awareness and their pronunciation performance detected in the study. Based on the results, pedagogical implications were suggested.<p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0307/a.php" alt="Hit counter" /></p>
THE EFFECT OF PRE-SERVICE TEACHERS' DIGITAL LITERACY LEVELS ON THEIR ATTITUDE FOR DIGITAL WRITING: STRUCTURAL EQUATION MODEL STUDY
Authors: Arslan Aysel 
Published: August 2022

<p>In this study, it was aimed to determine the effect of pre-service teachers' digital literacy levels on their attitudes towards writing in the digital environment. In addition, the mean scores of teacher candidates from both scales were examined in terms of different variables. Probability-based random sampling method, which is included in the general survey model, was preferred in the study. The sample of the research consists of 467 teacher candidates who attend Sivas Cumhuriyet University Faculty of Education in the spring semester of the 2021-2022 academic year. The data of the study were obtained by applying the <em>"Digital Literacy Scale"</em> developed by Ng (2012) and adapted into Turkish by Üstündağ, Güneş and Bahçivan (2017) and the <em>"Attitude Scale for Digital Writing"</em> developed by Kırmızı, Kapıkıran and Akkaya (2021). Research data were analyzed using normality tests, independent groups t-test, ANOVA, Scheffe, SEM and CFA statistical methods. In the findings obtained in the research, digital literacy of fathers education status, graduated high school type, time spent on the internet, computer, tablet, smart watch; on the other hand, it has been determined that the attitudes towards writing in the digital environment differ significantly according to the variables of gender, class level, place of residence, mother and father education level, branch, type of high school graduated, time spent on the internet, computer, smart phone, tablet, smart watch. In addition, it was concluded that digital literacy had a positive effect on their attitudes towards writing in the digital environment.</p><p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0949/a.php" alt="Hit counter" /></p>
EXAMINING THE FORMS AND STRATEGIES OF TEACHER INDUCTION PROGRAMMES ORGANISED FOR NEWLY QUALIFIED TEACHERS IN SENIOR HIGH SCHOOLS IN GHANA
Authors: Danso Afua Akomaa , Opoku-Asare Nana Afia Amponsaa , Asante Eric Appau 
Published: August 2022

<p>The education system recognises the positive impact of induction on the retention and professional growth of Newly Qualified Teachers in Ghana. This points out the question of how teacher induction programmes should be planned, organised and implemented, and what it should entail. The study sought to examine the forms and strategies of induction programmes organised for Newly Qualified Teachers in Senior High Schools during their initial professional practice. Using the descriptive case study method, data was gathered from forty-two Newly Qualified Teachers, three Assistant head teachers (Academics) from three sampled schools and one municipal human resource officer, all from Ashanti-Mampong Municipality in the Ashanti Region, Ghana. Questionnaire, interview, observation and document analysis were the research instruments used. Data were analysed using inductive and deductive analysis where similar themes and patterns were identified from responses and compared with literature. Findings show that, though an induction was organised for Newly Qualified Teachers, the schools lacked formal principles to guide and regulate the school-based induction programmes. Orientation and a few aspects of mentoring were the components of the induction programmes while continuous professional development activities were totally absent. Again, the whole induction took place within some hours which put Newly Qualified Teachers at a great disadvantage of not acquiring what they need as support. While assistant head teachers and heads of department were key stakeholders responsible for the induction, the latter was Newly Qualified Teachers’ point of call when faced with challenges. Since it is argued that teachers who receive the full components of induction are likely to adopt and implement effective pedagogical approaches, in the absence of formal policy to guide the planning and implementation of induction in Ghana, there is a need for officials at the district and municipal levels to closely monitor Senior High Schools and ensure proper organisation of their induction programmes.</p><p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0953/a.php" alt="Hit counter" /></p>
EFL SECONDARY AND HIGH SCHOOL STUDENTS’ PERCEPTIONS OF ADVANTAGES AND DIFFICULTIES OF WRITTEN FEEDBACK BY QUESTIONING IN WRITING
Authors: Nguyen Kha Manh , Le Mai Xuan 
Published: August 2022

This paper reports a descriptive study to enquire into English as a Foreign Language (EFL) secondary and high school (K-12) students’ perceptions about the advantages and difficulties of written feedback by questioning in writing. This paper draws on the data collected as part of a larger project including questionnaires and focus-group interviews. The findings reveal that students held positive perceptions about the impact of written feedback by questioning in writing, particularly on motivation, writing skills, and attitudes and preferences.<p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0555/a.php" alt="Hit counter" /></p>
AN EXAMINATION ABOUT THE DIDACTIC TRANSPOSITION IN THE POST-REMOTE TEACHING SCENARIO: OBSTACLES AND POSSIBILITIES
Authors: De Sousa Renata Teófilo , Alves Francisco Régis Vieira , Souza Maria José Araújo 
Published: August 2022

The aim of this work is to present the vision of the mathematics teacher about Didactic Transposition in the discipline of mathematics, pointing out their perceptions and various ways of working in two moments, one in the remote modality and another in the return to classroom teaching. To this end, we used a qualitative-qualitative methodology, in which fifteen mathematics teachers from the city of Sobral, Ceará, Brazil participated in the research, sharing their experiences through two virtual forms, answering some questions in two different periods – August/2021 and July/2022. The data provided us with information to reflect on the subject, verifying the main obstacles faced during and after the period of social isolation, as well as the good practices experienced and prospects for a post-pandemic scenario. Based on the answers and experiences shared by the research subjects, we understand that there were advantages in carrying out the Didactic Transposition of contents in the remote scenario, such as the possibility of using more than one technological resource during a teaching session, the dynamism that the use of different games and applications can provide, among other possibilities. However, negative aspects were also pointed out, such as difficulties in obtaining positive feedback, student participation and motivation, difficulties in handling technology in some cases or even reconciling work routine and activities in the home environment, negatively impacting teaching work. In addition, there is a perspective that face-to-face feedback brings the imperative of change, both in the format of classes and teaching methodologies, and in the professional attitude of the mathematics teacher.<p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0674/a.php" alt="Hit counter" /></p>
USING AUTHENTIC MATERIALS IN TEACHING SPEAKING TO GRADE 10 STUDENTS: TEACHERS’ PERCEPTIONS AND PRACTICES
Authors: Thai Han Bao Phan , Nguyen Huan Buu 
Published: August 2022

Authentic materials are considered as a beneficial tool for teachers and students in teaching speaking English as a foreign language. Speaking is one of the most significant skills for EFL students to communicate with other peers. It is also important for tertiary students in the Vietnamese context. However, a few studies about the relationship between authentic materials and speaking ability were conducted in Vietnamese high school contexts. Therefore, the current study aimed to find out high school teachers’ perceptions and practices of using authentic materials in teaching English speaking to Grade 10 students in a Vietnamese context. Data collected in this study include questionnaire and semi-structured interviews. Participants in this study were seventy-seven high school teachers in five provinces in the Mekong delta. Findings from this study reveal that teachers had positive perceptions of using authentic materials in teaching English speaking to Grade 10 students. Pedagogical implications for teachers and school administrators are also made.<p> </p><p><strong> Article visualizations:</strong></p><p><img src="/-counters-/edu_01/0347/a.php" alt="Hit counter" /></p>