bluuebunny/crossref_metadata_2025_split huggingface dataset:
Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer
Authors: Baines Ellyn K. , Thomas Armstrong J. , Clark James H. , Gorney Jim , Hutter Donald J. , Jorgensen Anders M. , Kyte Casey , Mozurkewich David , Nisley Ishara , Sanborn Jason , Schmitt Henrique R. , van Belle Gerard T. 
Published: October 2021

Abstract
We measured the angular diameters of 44 stars with the Navy Precision Optical Interferometer, obtaining uncertainties on the limb-darkened diameter of 2% or less for all but four stars. We then used our diameters with Gaia or Hipparcos parallaxes to calculate each star’s physical radius. We gathered information from the literature to determine bolometric flux and luminosity, and combined that with our diameters to produce an effective temperature. Our sample consists of mostly giant stars, and spans a wide range of spectral classes from B to M.
Mixed Modes and Asteroseismic Surface Effects. I. Analytic Treatment
Authors: Joel Ong 王 J. M. 加冕 , Basu Sarbani , Roxburgh Ian W. 
Published: October 2021

Abstract
Normal-mode oscillation frequencies computed from stellar models differ from those that would be measured from stars with identical interior structures because of modeling errors in the near-surface layers. These frequency differences are referred to as the asteroseismic “surface term.” The vast majority of solar-like oscillators that have been observed, and that are expected to be observed in the near future, are evolved stars that exhibit mixed modes. For these evolved stars, the inference of stellar properties from these mode frequencies has been shown to depend on how this surface term is corrected for. We show that existing parameterizations of the surface term account for mode mixing only to first order in perturbation theory, if at all, and therefore may not be adequate for evolved stars. Moreover, existing nonparametric treatments of the surface term do not account for mode mixing. We derive both a first-order construction and a more general approach for one particular class of nonparametric methods. We illustrate the limits of first-order approximations from both analytic considerations and using numerical injection-recovery tests on stellar models. First-order corrections for the surface term are strictly only applicable where the size of the surface term is much smaller than both the coupling strength between the mixed p and g modes, as well as the local g-mode spacing. Our more general matrix construction may be applied to evolved stars, where perturbation theory cannot be relied upon.
The Intrinsic Shapes of Low Surface Brightness Galaxies (LSBGs): A Discriminant of LSBG Galaxy Formation Mechanisms
Authors: Kado-Fong Erin , Petrescu Mihai , Mohammad Majid , Greco Johnny , Greene Jenny E. , Adams Elizabeth A. K. , Huang Song , Leisman Lukas , Munshi Ferah , Tanoglidis Dimitrios , Van Nest Jordan 
Published: October 2021

Abstract
We use the low surface brightness galaxy (LSBG) samples created from the Hyper Suprime-Cam Subaru Strategic Program (781 galaxies), the Dark Energy Survey (20977 galaxies), and the Legacy Survey (selected via H i detection in the Arecibo Legacy Fast ALFA Survey, 188 galaxies) to infer the intrinsic shape distribution of the LSBG population. To take into account the effect of the surface brightness cuts employed when constructing LSBG samples, we simultaneously model both the projected ellipticity and the apparent surface brightness in our shape inference. We find that the LSBG samples are well characterized by oblate spheroids, with no significant difference between red and blue LSBGs. This inferred shape distribution is in good agreement with similar inferences made for ultra-diffuse cluster galaxy samples, indicating that environment does not play a key role in determining the intrinsic shape of LSBGs. We also find some evidence that LSBGs are more thickened than similarly massive high surface brightness dwarfs. We compare our results to intrinsic shape measures from contemporary cosmological simulations, and find that the observed LSBG intrinsic shapes place considerable constraints on the formation path of such galaxies. In particular, LSBG production via the migration of star formation to large radii produces intrinsic shapes in good agreement with our observational findings.
Multi-scale Dust Polarization and Spiral-like Stokes-I Residual in the Class I Protostellar System TMC-1A
Authors: Aso Yusuke , Kwon Woojin , Hirano Naomi , Ching Tao-Chung , Lai Shih-Ping , Li Zhi-Yun , Rao Ramprasad 
Published: October 2021

Abstract
We have observed the Class I protostar TMC-1A in the Taurus molecular cloud using the Submillimeter Array (SMA) and the Atacama Large Millimeter/submillimeter Array (ALMA) in the linearly polarized 1.3 mm continuum emission at angular resolutions of ∼3″ and ∼0.3″, respectively. The ALMA observations also include CO, 13CO, and C18O J = 2−1 spectral lines. The SMA observations trace magnetic fields on the 1000 au scale, the directions of which are neither parallel nor perpendicular to the outflow direction. Applying the Davis–Chandrasekhar–Fermi method to the SMA polarization angle dispersion, we estimate a field strength in the TMC-1A envelope of 1–5 mG. It is consistent with the field strength needed to reduce the radial infall velocity to the observed value, which is substantially less than the local freefall velocity. The ALMA polarization observations consist of two distinct components—a central component and a north/south component. The central component shows polarization directions in the disk minor axis to be azimuthal, suggesting dust self-scattering in the TMC-1A disk. The north/south component is located along the outflow axis and the polarization directions are aligned with the outflow direction. We discuss possible origins of this polarization structure, including grain alignment by a toroidal magnetic field and mechanical alignment by the gaseous outflow. In addition, we discover a spiral-like residual in the total intensity (Stokes I) for the first time. The C18O emission suggests that material in the spiral-like structure is infalling at a speed that is 20% of the local Keplerian speed.
The Substructures in Disks Undergoing Vertical Shear Instability. II. Observational Predictions for the Dust Continuum
Authors: Blanco Diana , Ricci Luca , Flock Mario , Turner Neal 
Published: October 2021

Abstract
High-angular resolution observations at submillimeter/millimeter wavelengths of disks surrounding young stars have shown that their morphology is made of azimuthally symmetric or point-symmetric substructures, in some cases with spiral arms or localized spur- or crescent-shaped features. The majority of theoretical studies with the aim of interpreting the observational results have focused on disk models with planets under the assumption that the disk substructures are due to disk–planet interaction. However, so far, only in very few cases have exoplanets been detected in these systems. Furthermore, some substructures are expected to appear before planets form, as they are necessary to drive the concentration of small solids which can lead to the formation of planetesimals. In this work we present observational predictions from high-resolution 3D radiative hydrodynamical models that follow the evolution of gas and solids in a prototoplanetary disk. We focus on substructures in the distribution of millimeter-sized and smaller solid particles produced by the vertical shear instability. We show that their characteristics are compatible with some of the shallow gaps detected in recent observations at sub-mm/mm wavelengths and present predictions for future observations with better sensitivity and angular resolution with ALMA and a Next Generation Very Large Array.
Variations of the Martian Thermospheric Gravity-wave Activity during the Recent Solar Minimum as Observed by MAVEN
Authors: Yiğit Erdal , Medvedev Alexander S. , Hartogh Paul 
Published: October 2021

Abstract
Atmospheric gravity (buoyancy) waves (GWs) are of great importance for the energy and momentum budget of all planetary atmospheres. Propagating upward waves carry energy and momentum from the lower atmosphere to thermospheric altitudes and re-distribute them there. On Mars, GWs dominate the variability of the thermosphere and ionosphere. We provide a comprehensive climatology of Martian thermospheric GW activity at solar minimum (end of solar cycle 24) inferred from measurements by the Neutral Gas and Ions Mass Spectrometer on board the Mars Atmosphere and Volatile EvolutioN. The results are compared and interpreted using a one-dimensional spectral nonlinear GW model. Monthly mean GW activity varies strongly as a function of altitude (150–230 km) between 6% and 25%, reaching a maximum at ∼170 km. GW activity systematically exhibits a local time variability with nighttime values exceeding those during daytime, in accordance with previous studies. The analysis suggests that the day–night difference is primarily caused by a competition between dissipation due to molecular diffusion and wave growth due to decreasing background density. Thus, the convective instability mechanism is likely to play a less important role in limiting GW amplitudes in the upper thermosphere, which explains their local time behavior.
Identifying AGN Host Galaxies by Machine Learning with HSC+WISE
Authors: Chang Yu-Yen , Hsieh Bau-Ching , Wang Wei-Hao , Lin Yen-Ting , Lim Chen-Fatt , Toba Yoshiki , Zhong Yuxing , Chang Siou-Yu 
Published: October 2021

Abstract
We investigate the performance of machine-learning techniques in classifying active galactic nuclei (AGNs), including X-ray-selected AGNs (XAGNs), infrared-selected AGNs (IRAGNs), and radio-selected AGNs (RAGNs). Using the known physical parameters in the Cosmic Evolution Survey (COSMOS) field, we are able to create quality training samples in the region of the Hyper Suprime-Cam (HSC) survey. We compare several Python packages (e.g., scikit-learn, Keras, and XGBoost) and use XGBoost to identify AGNs and show the performance (e.g., accuracy, precision, recall, F1 score, and AUROC). Our results indicate that the performance is high for bright XAGN and IRAGN host galaxies. The combination of the HSC (optical) information with the Wide-field Infrared Survey Explorer band 1 and band 2 (near-infrared) information performs well to identify AGN hosts. For both type 1 (broad-line) XAGNs and type 1 (unobscured) IRAGNs, the performance is very good by using optical-to-infrared information. These results can apply to the five-band data from the wide regions of the HSC survey and future all-sky surveys.
Population Synthesis of Neutron Star X-Ray Binaries Associated with Supernova Remnants
Authors: Xing Ze-Pei , Li Xiang-Dong 
Published: October 2021

Abstract
Neutron star X-ray binaries (NS XRBs) associated with supernova remnants (SNRs) are youngest X-ray binaries that can provide insights into the early evolution of X-ray binaries and formation properties of neutron stars. There are an increasing number of NS XRBs that have been discovered within SNRs in our own and nearby galaxies. In this work, we perform binary population synthesis calculations to simulate the population of NS XRBs associated with SNRs for different types of companions, including Roche-lobe-overfilling main-sequence stars, Be stars, and supergiants. We estimate their birth rates and present the distributions of orbital parameters and companion mass for each type of companion. Our calculations show that the majority of the companions are Be X-ray binaries (BeXRBs) and that a few BeXRBs are expected to be associated with SNRs in a Milky Way–type galaxy.
The Mass Budgets and Spatial Scales of Exoplanet Systems and Protoplanetary Disks
Authors: Mulders Gijs D. , Pascucci Ilaria , Ciesla Fred J. , Fernandes Rachel B. 
Published: October 2021

Abstract
Planets are born from disks of gas and dust, and observations of protoplanetary disks are used to constrain the initial conditions of planet formation. However, dust mass measurements of Class II disks with ALMA have called into question whether they contain enough solids to build the exoplanets that have been detected to date. In this paper, we calculate the mass and spatial scale of solid material around Sun-like stars probed by transit and radial velocity exoplanet surveys and compare those to the observed dust masses and sizes of Class II disks in the same stellar-mass regime. We show that the apparent mass discrepancy disappears when accounting for observational selection and detection biases. We find a discrepancy only when the planet formation efficiency is below 100%, or if there is a population of undetected exoplanets that significantly contributes to the mass in solids. We identify a positive correlation between the masses of planetary systems and their respective orbital periods, which is consistent with the trend between the masses and the outer radii of Class II dust disks. This implies that, despite a factor 100 difference in spatial scale, the properties of protoplanetary disks seem to be imprinted on the exoplanet population.
θ
1 Ori C as a Medieval Bully: A Possible Very Recent Ejection in the Trapezium
Authors: Maíz Apellániz J. , Pantaleoni González M. , Barbá R. H. 
Published: October 2021

Abstract
We use Gaia EDR3 astrometry to propose that a dynamical interaction between the multiple system θ
1 Ori C and θ
1 Ori F ejected the latter as a walkaway star ∼1100 yr ago (without deceleration) or somewhat later (with a more likely deceleration included). It is unclear whether the final 3D velocity of θ
1 Ori F will be large enough to escape the Orion nebula cluster.
A Study of the Soft X-Ray Emission Lines in NGC 4151. II. The Internal Plasma Properties
Authors: Grafton-Waters S. , Dunn W. 
Published: October 2021

Abstract
We showcase a tool suite that enables the fitting of soft X-ray spectra in active galactic nuclei (AGNs), without the need for specialist software, allowing access to AGN physics for school students. While these standardized Python tools were useful for measuring velocities, they offered significantly fewer capabilities for radiative recombination continua, and R and G ratios, utilized to obtain the internal plasma properties within the outflowing wind seen in NGC 4151. Although further work is required for these tools to be used in outreach projects, we present findings of the plasma temperature and density in NGC 4151 spanning a 15 yr period.
Quick-look Pipeline Lightcurves for 9.1 Million Stars Observed over the First Year of the TESS Extended Mission
Authors: Kunimoto Michelle , Huang Chelsea , Tey Evan , Fong Willie , Hesse Katharine , Shporer Avi , Guerrero Natalia , Fausnaugh Michael , Vanderspek Roland , Ricker George 
Published: October 2021

Abstract
We present a magnitude-limited set of lightcurves for stars observed over the Transiting Exoplanet Survey Satellite (TESS) Extended Mission, as extracted from full-frame images (FFIs) by MIT’s Quick-Look Pipeline (QLP). QLP uses multi-aperture photometry to produce lightcurves for ∼1 million stars each 27.4 days sector, which are then searched for exoplanet transits. The per-sector lightcurves for 9.1 million unique targets observed over the first year of the Extended Mission (Sectors 27–39) are available as High-Level Science Products (HLSPs) on the Mikulski Archive for Space Telescopes. As in our TESS Primary Mission QLP HLSP delivery, our available data products include both raw and detrended flux time series for all observed stars brighter than TESS magnitude T = 13.5, providing the community with one of the largest sources of FFI-extracted lightcurves to date.
TAN LEJOS, TAN CERCA.
Authors: Alucin Silvia 
Published: October 2021

En el presente trabajo analizaremos las estrategias ensayadas durante la pandemia, en una escuela de la periferia de la ciudad de Rosario, Santa Fe, Argentina, para sostener el lazo social en el proceso de acompañamiento de trayectorias educativas. Para ello realizamos trabajo de campo con un enfoque antropológico, el cual nos permitió observar y analizar la política institucional de dicha escuela antes y durante la pandemia, construida en la implementación creativa y singular de políticas estatales. A nivel macro-político encontramos una estructura discursiva en la cual se dio el paso de la integración a la inclusión como horizonte, proceso en el cual el lazo social es concebido como garante del derecho a la educación, en una perspectiva de justicia educativa. Esto se plasmó a nivel micro político en una institucionalidad que pudo sostener el lazo social con otros y con la cultura, gracias a dinámicas ya consolidadas y a modalidades de acompañamiento nuevas, ensayadas artesanalmente para sostener la presencia en la distancia, en procesos subjetivantes.
TRANSITANDO EN PERSPECTIVA COMPLEJA LA HUMANA CONDICIÓN Y SUS LAZOS SOCIALES EN EDUCACIÓN E INVESTIGACIÓN
Authors: Josefa García de Ceretto  
Published: October 2021

El artículo da cuenta de una investigación compleja en prospectiva que germina en la aventura de pensamiento y acción en el posgrado en investigación de la UNR. Argentina. Concretiza enfoques complejos de los lazos sociales en la educación y la investigación en claves paradigmáticas atravesadas por la humana condición. Autores teóricos en debate y en dialógica con el investigador aportan la actualidad del enfoque y permiten la transdisciplinariedad. La metodología más allá de visiones técnicas e instrumentales se focaliza en la investigación cualitativa con aportes cuantitativos, los cuestionamientos emergentes en procesos de metamorfosis, disruptivos a partir de las posibilidades de los contextos educativos enfocados en la humana condición y los lazos sociales. La propuesta que avizoramos emerge de un entretejido entre planteo paradigmático, dimensión teórica, dimensión empírica que vierten sus contenidos en una propuesta que vislumbramos para la comprensión de los lazos sociales en la investigación compleja y en la educación en acción. Aprendizaje transformador que prioriza la condición humana donde emergen los lazos sociales que busca sujetos reflexivos, que piensan, interrogan, cuestionan, para co-construir una nueva forma de comprender la educación en sus lazos sociales en una era humana planetaria que conjugue los términos en una misma intención transformadora.
LA REFLEXIÓN DOCENTE COMO CATALIZADOR DE LA INVESTIGACIÓN EDUCATIVA: UN ANÁLISIS EN TIEMPOS DE PANDEMIA COVID-19
Authors: Wilson Patricio Chiluiza Vásquez  , Doris Soledad Parra Rocha  , Diana Amparito Castillo Conde  
Published: October 2021

El siguiente artículo pone de manifiesto la importancia del proceso de reflexión sobre la teoría y, a la par, sobre la práctica pedagógica. Practica que, a pesar del paso del tiempo, sigue dominada por la racionalidad técnica. En efecto, en pleno siglo xxi se evidencia que el modelo de la escuela tradicional sigue en auge. El contexto covid-19 ha exigido pasar de la presencialidad a la virtualidad en un ambiente de incertidumbre, dejando en evidencia las limitantes tecnológicas, sociales, políticas y de formación docente que debilitan el sistema educativo. Esta problemática obliga a repensar el quehacer educativo en busca de un pensamiento multidimensional, crítico y reflexivo. Uno de los puentes, como punto de encuentro entre la teoría, la práctica y la reflexión docente, es la investigación educativa; sin embargo, se evidencian muchas limitaciones que lejos de motivar alejan al docente del campo de la investigación. No obstante, las experiencias que aquí se relatan demuestran que un trabajo en equipo con docentes comprometidos y dispuestos a un aprendizaje continuo contribuye a que éstos tengan la posibilidad de superar obstáculos y convertirse en sus propios investigadores para de esta manera involucrarse en el ámbito de la investigación y la divulgación científica en pos de una nueva cultura investigativa.
An Overview of Paediatric Liver Transplant in Hospital Selayang: 2002 to 2015
Authors: Kam Choy-Chen , Lim Chooi-Bee 
Published: October 2021

Introduction: Hospital Selayang started the liver transplant program in 2002. We report a total of 81 liver transplant cases until year 2015. Among these, paediatric cases constitute almost half. This report aims to review the demography and outcome of paediatric liver transplant cases. Methodology: Case notes of all paediatric patients underwent liver transplant from year 2002 to 2015 were retrospectively reviewed. Results: A total of 38 paediatric cases received liver transplantations from year 2002 to 2015. Age at transplantation ranged from 11 months to 16 years old (mean age 6 years) and weight ranged from 6.47 to 63 kilogram (mean 18kg). There were 20 males and 18 females, 20 of them were Malay, whereas Chinese and Indian were 13 and 4 respectively. Eighteen cases were living-related and 20 cases were cadaveric liver transplants. For recipient blood group, O+ is the commonest. Biliary atresia was the most common indication for liver transplant (22 cases; 58%), followed by intrahepatic cholestasis disorders (5 cases; 13%) and metabolic disease (4 cases; 10%). Post transplantation, there were 6 (16%) biliary complications, 12 (32%) vascular complications, 26 (68%) developed early onset infection, 13% had acute rejection and 2 graft failure. Out of the 38 transplants, 79% of them survive after 1 year, and 69.7% survive after 5 years. The common causes of mortality were sepsis and vascular complications. Conclusion: Despite limited resources, a successful paediatric liver transplant programme has been established in Hospital Selayang with good survival rate.
MARKETING E TERRITÓRIO NO ENSINO SUPERIOR
Authors: Timóteo Leandro Xavier , Souza Maria Celeste Reis Fernandes de , Campos Renata Bernardes Faria 
Published: October 2021

Neste artigo foi discutido acerca do marketing direcionado por abordagem territorial e como é possível, por meio dele, construir e divulgar instituições de ensino superior diferenciadas, identificando os desejos e as necessidades de potenciais estudantes e desenvolvendo produtos e serviços melhores para atender às demandas. Diante disso, o objetivo deste artigo foi mapear a produção bibliográfica nos últimos dez anos sobre marketing e território no ensino superior. Para isso, foi realizada uma busca sistemática realizada no portal de periódicos da Capes. Foram considerados artigos revisados por pares, publicados nos últimos 10 anos na língua portuguesa, que continham os termos “Marketing, território” e “Ensino Superior”. Dos 66 artigos encontrados, 21 foram selecionados para revisão sistemática. Os demais não possuíam relação direta com a busca, pois não abordavam temas relacionados a marketing, território e ensino superior. Com o aumento do acesso ao Ensino Superior decorrente do crescimento da oferta do ensino na modalidade à distância, as ações de marketing se tornaram primordiais para a captação e manutenção dos estudantes. As redes sociais foram utilizadas como ferramenta para ampliarem as informações e conhecimento sobre as ofertas. À vista disso, é muito importante que as instituições estruturem ações para atingir o público-alvo.
Filosofía y “plus de sentido” en Franz Rosenzweig y Paul Ricoeur
Authors: Tell Maria Belen 
Published: October 2021

El presente escrito pretende mostrar el plus de sentido hallado en las propuestas filosóficas de Franz Rosenzweig y Paul Ricoeur, reconocido en la receptividad originaria y pasividad fundacional de la existencia, en cuanto estructura en tensión relacional-fundamental y lingüístico-existencial de llamada.
En este sentido, se sostendrá que el despliegue y el lenguaje filosófico en los autores delante mencionados, están tramados con apelaciones a formulaciones y expresiones supra-filosóficas de la hermenéutica bíblica judeo-cristiana, autorizando así una ampliación de la comprensión filosófica, y permitiendo también al pensamiento transformar su propio límite en paradigma amoroso de comunión.