bluuebunny/crossref_metadata_2025_split huggingface dataset:
First Spectral Analysis of a Solar Plasma Eruption Using ALMA
Authors: Rodger Andrew S. , Labrosse Nicolas , Wedemeyer Sven , Szydlarski Mikolaj , Simões Paulo J. A. , Fletcher Lyndsay 
Published: April 2019

Abstract
The aim of this study is to demonstrate how the logarithmic millimeter continuum gradient observed using the Atacama Large Millimeter/submillimeter Array (ALMA) may be used to estimate optical thickness in the solar atmosphere. We discuss how using multiwavelength millimeter measurements can refine plasma analysis through knowledge of the absorption mechanisms. Here we use subband observations from the publicly available science verification (SV) data, while our methodology will also be applicable to regular ALMA data. The spectral resolving capacity of ALMA SV data is tested using the enhancement coincident with an X-ray bright point and from a plasmoid ejection event near active region NOAA12470 observed in Band 3 (84–116 GHz) on 2015 December 17. We compute the interferometric brightness temperature light curve for both features at each of the four constituent subbands to find the logarithmic millimeter spectrum. We compared the observed logarithmic spectral gradient with the derived relationship with optical thickness for an isothermal plasma to estimate the structures’ optical thicknesses. We conclude, within 90% confidence, that the stationary enhancement has an optical thickness between 0.02 ≤ τ ≤ 2.78, and that the moving enhancement has 0.11 ≤ τ ≤ 2.78, thus both lie near to the transition between optically thin and thick plasma at 100 GHz. From these estimates, isothermal plasmas with typical Band 3 background brightness temperatures would be expected to have electron temperatures of ∼7370–15300 K for the stationary enhancement and between ∼7440 and 9560 K for the moving enhancement, thus demonstrating the benefit of subband ALMA spectral analysis.
Mixing via Thermocompositional Convection in Hybrid C/O/Ne White Dwarfs
Authors: Schwab Josiah , Garaud Pascale 
Published: April 2019

Abstract
Convective overshooting in super asymptotic giant branch stars has been suggested to lead to the formation of hybrid white dwarfs with carbon–oxygen cores and oxygen–neon mantles. As the white dwarf cools, this core–mantle configuration becomes convectively unstable and should mix. This mixing has been previously studied using stellar evolution calculations, but these made the approximation that convection did not affect the temperature profile of the mixed region. In this work, we perform direct numerical simulations of an idealized problem representing the core–mantle interface of the hybrid white dwarf. We demonstrate that, while the resulting structure within the convection zone is somewhat different than what is assumed in the stellar evolution calculations, the two approaches yield similar results for the size and growth of the mixed region. These hybrid white dwarfs have been invoked as progenitors of various peculiar thermonuclear supernovae. This lends further support to the idea that if these hybrid white dwarfs form, then they should be fully mixed by the time of explosion. These effects should be included in the progenitor evolution, in order to more accurately characterize the signatures of these events.
PSR J1306-40: An X-Ray Luminous Redback with an Evolved Companion
Authors: Swihart Samuel J. , Strader Jay , Chomiuk Laura , Shishkovsky Laura 
Published: April 2019

Abstract
PSR J1306–40 is a millisecond pulsar (MSP) binary with a non-degenerate companion in an unusually long ∼1.097 day orbit. We present new optical photometry and spectroscopy of this system, and model these data to constrain fundamental properties of the binary such as the component masses and distance. The optical data imply a minimum neutron star mass of 1.75 ± 0.09 M
⊙ (1σ) and a high, nearly edge-on inclination. The light curves suggest a large hot spot on the companion, suggestive of a portion of the pulsar wind being channeled to the stellar surface by the magnetic field of the secondary, mediated via an intrabinary shock. The Hα line profiles switch rapidly from emission to absorption near the companion inferior conjunction, consistent with an eclipse of the compact emission region at these phases. At our optically inferred distance of 4.7 ± 0.5 kpc, the X-ray luminosity is ∼1033 erg s−1, brighter than nearly all known redbacks in the pulsar state. The long-period, subgiant-like secondary, and luminous X-ray emission suggest this system may be part of the expanding class of MSP binaries that are progenitors to typical field pulsar–white dwarf binaries.
Bright Mini-outburst Ends the 12 yr Long Activity of the Black Hole Candidate Swift J1753.5–0127
Authors: Zhang G.-B. , Bernardini F. , Russell D. M. , Gelfand J. D. , Lasota J.-P. , Qasim A. Al , AlMannaei A. , Koljonen K. I. I. , Shaw A. W. , Lewis F. , Tomsick J. A. , Plotkin R. M. , Miller-Jones J. C. A. , Maitra D. , Homan J. , Charles P. A. , Kobel P. , Perez D. , Doran R. 
Published: April 2019

Abstract
We present optical, UV, and X-ray monitoring of the short orbital period black hole X-ray binary candidate Swift J1753.5–0127, focusing on the final stages of its 12 yr long outburst that started in 2005. From 2016 September onward, the source started to fade, and within 3 months, the optical flux almost reached the quiescent level. Soon after that, using a new proposed rebrightening classification method, we recorded a mini-outburst and a reflare in the optical light curves, peaking in 2017 February (V ∼ 17.0) and May (V ∼ 17.9), respectively. Remarkably, the mini-outburst has a peak flux consistent with the extrapolation of the slow decay before the fading phase preceding it. The following reflare was fainter and shorter. We found from optical colors that the temperature of the outer disk was ∼11,000 K when the source started to fade rapidly. According to the disk instability model, this is close to the critical temperature when a cooling wave is expected to form in the disk, shutting down the outburst. The optical color could be a useful tool to predict decay rates in some X-ray transients. We notice that all X-ray binaries that show mini-outbursts following a main outburst are short orbital period systems (<7 hr). In analogy with another class of short-period binaries showing similar mini-outbursts, the cataclysmic variables of the RZ LMi type, we suggest that mini-outbursts could occur if there is a hot inner disk at the end of the outburst decay.
CNO Emission of an Unlensed Submillimeter Galaxy at z = 4.3
Authors: Tadaki Ken-ichi , Iono Daisuke , Hatsukade Bunyo , Kohno Kotaro , Lee Minju M. , Matsuda Yuichi , Michiyama Tomonari , Nakanishi Kouichiro , Nagao Tohru , Saito Toshiki , Tamura Yoichi , Ueda Junko , Umehata Hideki 
Published: April 2019

Abstract
We present the results from Atacama Large Millimeter/submillimeter Array observations of [N ii] 205 μm, [C ii] 158 μm, and [O iii] 88 μm lines in an unlensed submillimeter galaxy at z = 4.3, COSMOS-AzTEC-1, hosting a compact starburst core with an effective radius of ∼1 kpc. The [C ii] and [N ii] emission are spatially resolved in 0.″3-resolution (1 kpc in radius). The kinematic properties of the [N ii] emission are consistent with those of the CO(4–3) and [C ii] emission, suggesting that the ionized gas feels the same gravitational potential as the associated molecular gas and photodissociation regions (PDRs). On the other hand, the spatial extent is different among the lines and dust continuum: the [C ii] emitting gas is the most extended and the dust is the most compact, leading to a difference of the physical conditions in the interstellar medium. We derive the incident far-ultraviolet flux and the hydrogen gas density through PDR modeling by properly subtracting the contribution of ionized gas to the total [C ii] emission. The observed [C ii] emission is likely produced by dense PDRs with

cm−3 and G
0 = 103.5–3.75 in the central 1 kpc region and

cm−3 and G
0 = 103.25–3.5 in the central 3 kpc region. We have also successfully measured the line ratio of [O iii]/[N ii] in the central 3 kpc region of COSMOS-AzTEC-1 at z = 4.3, which is the highest redshift where both nitrogen and oxygen lines are detected. Under the most likely physical conditions, the measured luminosity ratio of L
[O iii]/L
[N ii] = 6.4 ± 2.2 indicates a near solar metallicity with Z
gas = 0.7–1.0 Z
⊙, suggesting a chemically evolved system at z = 4.3.
Taiwanese university students’ smartphone use and the privacy paradox
Authors: Katherine-Chen Yi-Ning , Ryan-Wen Chia-Ho 
Published: April 2019

With the prevalence of smart devices and wireless Internet, privacy has become a pivotal matter in governmental, academic, and technological fields. Our study aims to understand Taiwanese university students’ privacy concerns and protective behaviours in relation to online targeting ads and their habitual smartphone usage. Surveying 810 valid subjects, our results first propose that ad relevance has direct bearing on attention to ads. Second, ad relevance inversely correlates with privacy concerns (i.e. descending personal control and surging corporate power) and protective behaviours (self-filtering and ad evasion). Third and finally, neither privacy concerns nor protective behaviours have a negative bearing on habitual smartphone usage. Opposite to previous research, our study concludes that Taiwanese college students exhibit zero privacy paradox, owing to no signs of privacy concern incited by mobile targeting ads, no evidence of significant protective behaviours, and no decreasing habitual smartphone usage out of privacy concern and protection. Our findings indicate Taiwanese university students’ shaky awareness of potential risks and crises from exposure to vulnerable online privacy management. To deal with this, we suggest educating youths’ understandings of digital jeopardy by experts is urgently needed more so than just technical tutorials of privacy settings.Con la prevalencia de dispositivos inteligentes e Internet inalámbrico, la privacidad se ha convertido en un tema esencial en materias gubernamentales, académicas y tecnológicas. Nuestro estudio se dedica específicamente a entender las preocupaciones de los estudiantes universitarios taiwaneses en privacidad y comportamientos protectores en relación con la publicidad online y el uso habitual de teléfonos inteligentes. Con 810 muestras válidas encuestadas, nuestros resultados revelan que: 1) La relevancia de la publicidad tiene un efecto directo en su atención; 2) Está asociada inversamente a las preocupaciones de privacidad (por ejemplo, control personal descendiente y poder corporativo ascendiente) y comportamientos protectores (evasión de anuncios y autocensura); 3) La preocupación por ña privacidad ni los comportamientos protectores tuvieron efecto negativo en el uso habitual de los smartphones. Nuestro estudio concluye que no hay paradojas de la privacidad halladas en estos jóvenes taiwaneses debido a cambios en su preocupación por la privacidad, generada por la publicidad personalizada en su móvil. Ello evidencia un cambio significativo en los comportamientos protectores. En suma, estos universitarios taiwaneses tienen una débil apreciación de los riesgos potenciales y crisis a los que una vulnerable gestión de la privacidad online les podría exponer. Para abordarlo, una educación que cultive la comprensión de los peligros digitales para los jóvenes es muy recomendable y requiere urgentemente tutoriales técnicos sobre privacidad.
Systematic review of the current state of research on Online Social Networks: Taxonomy on experience of use
Authors: Pertegal-Vega Miguel-Ángel , Oliva-Delgado Alfredo , Rodríguez-Meirinhos Ana 
Published: April 2019

The widespread use of online social networks (OSN) among young people has been accompanied by an increase of publications about them and their effects on the psychosocial development of users. Previous panoramic reviews on OSN research are now outdated and do not provide a comprehensive view of the complexity of the user experience. The aims of this systematic review were three: to identify quantitative studies on OSN; to build a taxonomy about the user experience; and to classify studied variables in the topics and subtopics. The literature search and review according to PICoS strategy led to 546 identified publications that met the eligibility criteria. The taxonomy included nine major topics: overall use; activities and types of use; perceptions and attitudes OSN; the social network of online contacts; needs and motives for use; profile and privacy management; social processes; identity processes; and cognitive-emotional processes related to use of OSN. The three most studied topics were: overall use; activities and types of use; and social processes related to use of OSN. Classification and quantification of the different variables studied about the users’ experience is detailed. Several theoretical perspectives are discussed, as well as the gaps and challenges in OSN research. The proposed taxonomy could be useful for researchers to better delineate the aims of future studies.
La generalización del uso de redes sociales en jóvenes ha supuesto un incremento notable de las publicaciones sobre ellas y sobre sus efectos en el desarrollo psicosocial de los usuarios. Las tentativas previas de revisión panorámica sobre redes quedaron desfasadas y no aportan una visión comprehensiva de la complejidad de la experiencia de uso. Los objetivos de esta revisión sistemática actualizada fueron: identificar estudios cuantitativos sobre redes; construir una taxonomía sobre la experiencia de uso; y clasificar las variables estudiadas en temas y subtemas. La búsqueda y revisión de literatura siguiendo la estrategia PICoS identificó 546 estudios que cumplían los criterios de inclusión. La taxonomía incluyó nueve grandes temáticas investigadas: descripción y cuantificación del uso; actividades y tipos de uso; percepción y actitudes influyentes en el uso; red social de contactos; necesidades y motivos de uso; gestión del perfil y privacidad; procesos sociales; procesos identitarios; y procesos cognitivos-emocionales. Los tres temas más estudiados fueron: la descripción y cuantificación del uso; las actividades y tipos de uso; y los procesos sociales relacionados con el uso. Se detalla la clasificación, cuantificación e integración de las diversas variables estudiadas sobre la experiencia de uso. Las diferentes tradiciones de estudio, así como las lagunas, problemas y retos de la investigación sobre redes son discutidas. Dicha taxonomía será de utilidad para que investigadores puedan encuadrar mejor los objetivos de futuros estudios.
The Admiral Nurse Competency Framework: Encouraging Engagement and Putting It Into Practice
Authors: Carter Christine , Bray Jennifer , Read Kate 
Published: April 2019

Background:
Admiral Nurses undertake complex work with families living with dementia. Dementia UK commissioned The Association for Dementia Studies to refresh the Admiral Nurse Competency Framework and enable Admiral Nurses to articulate and critically reflect on their own practice progression. The Admiral Nurses were involved throughout the process to refresh the framework to ensure it was evidence based.

Method:
To encourage engagement with the framework, The Association for Dementia Studies worked with the Admiral Nurses during a roll-out phase. An exercise was developed to initiate critical reflective discussion. Critiquing a colleague's practice is a skill, provoking defensiveness if not facilitated thoughtfully.

Results:
An exercise combining art cards with case study analysis worked well, promoting critical reflective dialogue between Admiral Nurses as peers. Engagement and feedback were positive, and the neutrality of the exercise provided a safe environment with the flexibility to allow in-depth and meaningful discussions.

Conclusion:

This technique could benefit work-based learning, facilitating creative critical reflection within practice.

[
J Contin Educ Nurs.
2019;50(5):205–210.]
The Clinical Nurse Educator Role: A Snapshot in Time
Authors: Coffey Jean Sheerin , White Briana Lee 
Published: April 2019

Background:The role of the clinical nurse educator (CNE), vital to safe patient care and professional development of clinical nurses, is poorly defined in the literature with respect to the how the CNE spends his or her time.Method:This study set out to quantify the role of the CNE in a large, rural, and tertiary academic medical center using the measure of time. A group of nine Master's-prepared CNEs voluntarily participated in a month-long time analysis hypothesizing, then reporting, the number of hours spent in each practice domain (clinical practice support, central orientation, system-wide initiatives, and professional development).Results:At the completion of the month, the data suggested that the majority of the time spent by the nurse educator was in clinical practice support.Conclusion:The findings begin to quantify the CNE role and reinforced the need for more role clarity related to how CNEs' time is spent.[J Contin Educ Nurs.2019;50(5):228–232.]
Special P&A with Resin and Microcement Pumped from Interception Well Due to Multi-String Collapse
Authors: Campos Gilson , Piedade Thiago Santos , Ramos Antônio Carlos , Anjos Jorel Lopes , Azevedo Anderson Caetano , Abdu João Paulo Sanseverino , Terra Felipe Souza , Silva Leonardo Pacheco 
Published: April 2019

During the production phase of the PW1 well, an unintentional operation depressurized the annulus A below its design limit, resulting in a progressive casing collapse from the surface casing to the tubing. Therefore, it was not possible to abandon the well conventionally. This complex abandonment scenario demanded for a rig to drill an intervention well (IW1) and set up the safety barriers. The IW1 well was successfully drilled, intercepting the production well (PW1) at 3,056-m (TD) through a 1.10-m long slotted window. The whole operation was monitored via PDG from the PW1, making possible to identify the exact moment that the interception occurred and safely displacing the cementing fluids, while avoiding the risk of fracturing exposed formations. Numerical simulations and real time monitoring of the injection pressure demonstrated the success of the operation with excellent adherence between the plan and the execution phases.
Due to the restrictions imposed by the characteristics of the PW1 reservoir, production tubing and its accessories, such as, slotted liner, ESP, NRV and DHSV, it was necessary to evaluate plugging materials that could be displaced through those restrictions without reaching the fracture limit of formation at the IW1 casing shoe. Ultrafine cement, pure resin and combinations of both were selected for their ability to pass through restrictions and resist to contamination by fluids present in the well, while also developing compressive strength to provide zonal isolation. Optimized plugging formulations were evaluated by passing them through artificial porous media, which simulated the PW1 well restrictions.
After 87 operational days, the PW1 well was successfully abandoned. A 79-m long cement plug was set in the annulus A and inside the tubing. The safety barrier was established and verified with pressure tests according to the regulatory criteria imposed by the National Agency of Petroleum, Natural Gas and Biofuels (ANP).
Estimation de la prévalence et du taux d’incidence du trouble du spectre de l’autisme (TSA). Comparaison interprovinciale
Authors: Diallo Fatoumata Binta , Pelletier Éric , Vasiliadis Helen-Maria , Rochette Louis , Lin Elizabeth , Smith Mark , Langille Donald , Thompspon Angus , Noiseux Manon , Vanasse Alain , St-Laurent Danielle , Kisely Steven , Fombonne Éric , Lesage Alain 
Published: April 2019

L’objectif de cet article est d’estimer la prévalence et le taux d’incidence du trouble du spectre de l’autisme (TSA) diagnostiqué chez les enfants et les adolescents à partir de données médico-administratives jumelées de quatre provinces canadiennes. Un objectif secondaire est de comparer les résultats obtenus afin d’établir si les fichiers administratifs peuvent servir de système d’information pour la surveillance du TSA au Canada.
Les estimations ont été produites à partir des données provenant des provinces du Manitoba, de l’Ontario, du Québec et de la Nouvelle-Écosse. La population à l’étude est composée de tous les résidents âgés de 24 ans et moins admissibles au régime d’assurance maladie en vertu de la loi provinciale entre 1999 à 2012. Pour être considéré comme ayant un TSA, l’individu devra avoir eu au moins une visite médicale ou une hospitalisation avec un diagnostic principal de TSA (codes 299 de la CIM-9 ou leurs équivalents CIM-10-CA). La prévalence annuelle et le taux d’incidence sont mesurés pour la période allant de 1999-2000 à 2011-2012, et présentés selon le sexe et par groupes d’âge.
La prévalence du TSA entre 1999 et 2012 a connu une forte progression dans toutes les provinces et pour tous les groupes d’âge. Le taux d’incidence a suivi la même tendance d’accroissement dans le temps. La prévalence et le taux d’incidence du TSA n’ont pas augmenté de façon similaire dans toutes les provinces du Canada. L’Ontario semble afficher les plus fortes proportions, suivi de la Nouvelle-Écosse.
Nos résultats permettent non seulement de dresser un portrait du TSA dans quatre provinces canadiennes, mais soulèvent aussi de nombreuses pistes pour de futures recherches. Cette étude discute également de l’utilité, de la fiabilité et du potentiel des fichiers médico-administratifs en matière de recherche.
Comparison of different methods for optical gain spectroscopy
Authors: Kunzmann Dominic J. , Wachs Matthias , Uhlig Lukas , Schwarz Ulrich T. 
Published: April 2019

Abstract
The internal losses of green and blue laser diodes are challenging to determine because of the narrow longitudinal mode spacing. Furthermore, the internal losses of state-of-the-art blue and green laser diodes are in the range of only a few inverse centimeter. Therefore the dynamical range given by the maxima and minima of the longitudinal mode spectrum is very large, even for moderate optical gain. Under these conditions, the usually employed, so-called Hakki–Paoli method to determine the optical gain becomes inaccurate. Now, we compare this with two other methods, the Cassidy method and an evaluation based on a Fourier transformation for a green laser diode. An error estimation as well as a correction of the systematic error caused by the spectral resolution of the setup were established. The overall highest gain was measured with the Cassidy method in the range of the lasing wavelength, as this method is least affected by the spectral resolution. In comparison of all methods, the highest gain for the wavelengths above the lasing wavelength is observed for one variation of the Fourier method, because background noise has the least influence on this method. For wavelengths below lasing wavelength we see similiar optical gain for all methods.