bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multiwavelength Photometry and Progenitor Analysis of the Nova V906 Car
Authors: Wee Jerrick , Blagorodnova Nadejda , Penprase Bryan Edward , Facey Jett Pierce , Morioka Taiga , Corbett Hank , Barlow Brad N. , Kupfer Thomas , Law Nicholas M. , Ratzloff Jeffrey K. , Howard Ward S. , Chavez Ramses Gonzalez , Glazier Amy , Soto Alan Vasquez , Horiuchi Takashi 
Published: August 2020

Abstract
We present optical and infrared photometry of the classical nova V906 Car, also known as Nova Car 2018 and ASASSN-18fv, which was discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN) on 2018 March 16.32 UT (MJD 58193.0). The nova reached its maximum on MJD 58222.56 at V
max = 5.84 ± 0.09 mag, and had decline times of

days and

days. The data from Evryscope shows that the nova had already brightened to

mag five days before discovery, as compared with its quiescent magnitude of g = 20.13 ± 0.03. The extinction toward the nova, as derived from high-resolution spectroscopy, shows an estimate consistent with foreground extinction to the Carina Nebula of

. The light curve resembles a rare C (cusp) class nova with a steep decline slope of α = −3.94 post-cusp flare. From the light-curve decline rate, we estimate the mass of the white dwarf to be M
WD = <0.8M
⊙, consistent with

derived from modeling the accretion disk of the system in quiescence. The donor star is likely a K-M dwarf of 0.23–0.43

, which is heated by its companion.
Dual Supermassive Black Holes at Close Separation Revealed by the Hyper Suprime-Cam Subaru Strategic Program
Authors: Silverman John D. , Tang Shenli , Lee Khee-Gan , Hartwig Tilman , Goulding Andy , Strauss Michael A. , Schramm Malte , Ding Xuheng , Riffel Rogemar A. , Fujimoto Seiji , Hikage Chiaki , Imanishi Masatoshi , Iwasawa Kazushi , Jahnke Knud , Kayo Issha , Kashikawa Nobunari , Kawaguchi Toshihiro , Kohno Kotaro , Luo Wentao , Matsuoka Yoshiki , Matsuda Yuichi , Nagao Tohru , Oguri Masamune , Ono Yoshiaki , Onoue Masafusa , Ouchi Masami , Shimasaku Kazuhiro , Suh Hyewon , Suzuki Nao , Taniguchi Yoshiaki , Toba Yoshiki , Ueda Yoshihiro , Yasuda Naoki 
Published: August 2020

Abstract
The unique combination of superb spatial resolution, wide-area coverage, and deep depth of the optical imaging from the Hyper Suprime-Cam (HSC) Subaru Strategic Program is utilized to search for dual quasar candidates. Using an automated image analysis routine on 34,476 known Sloan Digital Sky Survey quasars, we identify those with two (or more) distinct optical point sources in HSC images covering 796 deg2. We find 421 candidates out to a redshift of 4.5 of which one hundred or so are more likely after filtering out contaminating stars. Angular separations of 0.″6–4.″0 correspond to projected separations of 3–30 kpc, a range relatively unexplored for population studies of luminous dual quasars. Using Keck I/Low Resolution Imaging Spectrometer and Gemini-N/Near-Infrared Integral Field Spectrometer, we spectroscopically confirm three dual quasar systems at z < 1, two of which are previously unknown out of eight observed, based on the presence of characteristic broad emission lines in each component, while highlighting that the continuum of one object in one of the pairs is reddened. In all cases, the [O iii]λ5007 emission lines have mild velocity offsets, thus the joint [O iii] line profile is not double-peaked. We find a dual quasar fraction of 0.26 ± 0.18% and no evidence for evolution. A comparison with the Horizon-AGN simulation seems to support the case of no evolution in the dual quasar fraction when broadly matching the quasar selection. These results may indicate a scenario in which the frequency of the simultaneous triggering of luminous quasars is not as sensitive as expected to the cosmic evolution of the merger rate or gas content of galaxies.
A Distant Fast Radio Burst Associated with Its Host Galaxy by the Very Large Array
Authors: Law Casey J. , Butler Bryan J. , Prochaska J. Xavier , Zackay Barak , Burke-Spolaor Sarah , Mannings Alexandra , Tejos Nicolas , Josephy Alexander , Andersen Bridget , Chawla Pragya , Heintz Kasper E. , Aggarwal Kshitij , Bower Geoffrey C. , Demorest Paul B. , Kilpatrick Charles D. , W. Lazio T. Joseph , Linford Justin , Mckinven Ryan , Tendulkar Shriharsh , Simha Sunil 
Published: August 2020

Abstract
We present the discovery and subarcsecond localization of a new fast radio burst (FRB) by the Karl G. Jansky Very Large Array (VLA) and realfast search system. The FRB was discovered on 2019 June 14 with a dispersion measure of 959

. This is the highest DM of any localized FRB and its measured burst fluence of 0.6 Jy ms is less than nearly all other FRBs. The source is not detected to repeat in 15 hr of VLA observing and 153 hr of CHIME/FRB observing. We describe a suite of statistical and data quality tests we used to verify the significance of the event and its localization precision. Follow-up optical/infrared photometry with Keck and Gemini associate the FRB with a pair of galaxies with

mag. The false-alarm rate for radio transients of this significance that are associated with a host galaxy is roughly

. The two putative host galaxies have similar photometric redshifts of

, but different colors and stellar masses. Comparing the host distance to that implied by the dispersion measure suggests a modest (

) electron column density associated with the FRB environment or host galaxy/galaxies.
The Turbulent Gas Structure in the Centers of NGC 253 and the Milky Way
Authors: Krieger Nico , Bolatto Alberto D. , Koch Eric W. , Leroy Adam K. , Rosolowsky Erik , Walter Fabian , Weiß Axel , Eden David J. , Levy Rebecca C. , Meier David S. , Mills Elisabeth A. C. , Moore Toby , Ott Jürgen , Su Yang , Veilleux Sylvain 
Published: August 2020

Abstract
We compare molecular gas properties in the starbursting center of NGC 253 and the Milky Way Galactic center (GC) on scales of ∼1–100 pc using dendrograms and resolution-, area-, and noise-matched data sets in CO (1–0) and CO (3–2). We find that the size–line width relations in NGC 253 and the GC have similar slope, but NGC 253 has larger line widths by factors of ∼2–3. The σ
2/R dependency on column density shows that, in the GC, on scales of 10–100 pc the kinematics of gas over N > 3 × 1021 cm−2 are compatible with gravitationally bound structures. In NGC 253 this is only the case for column densities N > 3 × 1022 cm−2. The increased line widths in NGC 253 originate in the lower column density gas. This high velocity dispersion, not gravitationally self-bound gas, is likely in transient structures created by the combination of high average densities and feedback in the starburst. The high densities turn the gas molecular throughout the volume of the starburst, and the injection of energy and momentum by feedback significantly increases the velocity dispersion at a given spatial scale over what is observed in the GC.
Nanoflare Diagnostics from Magnetohydrodynamic Heating Profiles
Authors: Knizhnik K. J. , Barnes W. T. , Reep J. W. , Uritsky V. M. 
Published: August 2020

Abstract
The nanoflare paradigm of coronal heating has proven extremely promising for explaining the presence of hot, multi-million degree loops in the solar corona. In this paradigm, localized heating events supply enough energy to heat the solar atmosphere to its observed temperatures. Rigorously modeling this process, however, has proven difficult because it requires an accurate treatment of both the magnetic field dynamics and reconnection as well as the plasma response to magnetic perturbations. In this paper, we combine fully 3D magnetohydrodynamic (MHD) simulations of coronal active region plasma driven by photospheric motions with spatially averaged, time-dependent hydrodynamic (HD) modeling of coronal loops to obtain physically motivated observables that can be quantitatively compared with observational measurements of active region cores. We take the behavior of reconnected field lines from the MHD simulation and use them to populate the HD model to obtain the thermodynamic evolution of the plasma and subsequently the emission measure distribution. We find that the photospheric driving of the MHD model produces only very low-frequency nanoflare heating that cannot account for the full range of active region core observations as measured by the low-temperature emission measure slope. Additionally, we calculate the spatial and temporal distributions of field lines exhibiting collective behavior, and argue that loops occur due to random energization occurring on clusters of adjacent field lines.
Identifying and Tracking Solar Magnetic Flux Elements with Deep Learning
Authors: Jiang Haodi , Wang Jiasheng , Liu Chang , Jing Ju , Liu Hao , Wang Jason T. L. , Wang Haimin 
Published: August 2020

Abstract
Deep learning has drawn significant interest in recent years due to its effectiveness in processing big and complex observational data gathered from diverse instruments. Here we propose a new deep learning method, called SolarUnet, to identify and track solar magnetic flux elements or features in observed vector magnetograms based on the Southwest Automatic Magnetic Identification Suite (SWAMIS). Our method consists of a data preprocessing component that prepares training data from the SWAMIS tool, a deep learning model implemented as a U-shaped convolutional neural network for fast and accurate image segmentation, and a postprocessing component that prepares tracking results. SolarUnet is applied to data from the 1.6 m Goode Solar Telescope at the Big Bear Solar Observatory. When compared to the widely used SWAMIS tool, SolarUnet is faster while agreeing mostly with SWAMIS on feature size and flux distributions and complementing SWAMIS in tracking long-lifetime features. Thus, the proposed physics-guided deep learning-based tool can be considered as an alternative method for solar magnetic tracking.
The Variable Mg ii Narrow Absorption Line Systems
Authors: Chen Zhi-Fu , Qin Huan-Chang , Gui Run-Jin , Yi Shuang-Xi , Chen Zhe-Geng , Gao Yan-Chun , Pang Ting-Ting , Mo Xiao-Hua 
Published: August 2020

Abstract
Compared to high ionization C iv absorption lines, variable Mg ii absorption lines are rare. Using spectra from the Sloan Digital Sky Survey, we investigate the variations in Mg ii narrow absorption lines (NALs) for quasars with multi-epoch observations. We have compiled 8958 Mg ii NALs in the spectral regions from the red wings of C iv emission lines to the red wings of Mg ii emission lines. Among these 8958 Mg ii NALs, 22 variable NALs are detected with

and with velocity offsets ranging from

to 145,513

. We find that: (1) the detected frequency of Mg ii NALs with

is significantly larger than the uniformly random value expected for the Mg ii NALs with

, (2) the incidence rates of the variable Mg ii NALs with

are much larger than those with

, (3) the velocity offsets of variable Mg ii NALs with

are much smaller than the maximum velocities expected from radiation-driven outflows, and (4) the variations of variable Mg ii NALs with

are obviously correlated with the changes in the quasar radiative output. Therefore, the 16 variable Mg ii NALs, whose velocities are smaller than the maximum velocities expected from radiation-driven outflows, are likely related to quasar outflows, while the 6 variable Mg ii NALs, whose velocities are much larger than the maximum velocities expected from radiation-driven outflows, possibly originated in intervening gas. We also find that both the variations and fractional variations in absorption strengths are not related to the velocity offsets of Mg ii NALs and the time intervals between the two epochs of observations. Also, the fractional variations in absorption strengths are inversely correlated with absorption strengths. In addition, both the associated and intervening Mg ii NALs can significantly vary on a timescale of days.
Flight Calibration of the Van Allen Probe Magnetometers
Authors: Vasquez Bernard J. , Smith Charles W. , Paulson Kristoff W. , Kletzing C. A. 
Published: August 2020

Abstract
The twin Van Allen Probes each carry a triaxial fluxgate magnetometer. Their orbits transverse a large of range of magnetic intensity. A procedure is described that calibrates the magnetometer in the spinning-spacecraft frame and in the presence of a persistent gradient of the magnetic field. This is done by extending a model based on a constant background magnetic field to a model with a changing magnetic field during intervals used for calibration. Model parameters derived from short intervals are obtained by direct calculation, and uncertainties are propagated throughout the analysis. A daily ensemble analysis of interval-derived parameters and uncertainties is then made to correct for sensor bias and misalignment. The whole analysis is iterated to convergence in a few steps based on the estimated uncertainties associated with the model parameters.
Magnetosheath Jets and Plasmoids: Characteristics and Formation Mechanisms from Hybrid Simulations
Authors: Preisser Luis , Blanco-Cano Xóchitl , Kajdič Primoz , Burgess David , Trotta Domenico 
Published: August 2020

Abstract
Magnetosheath jets and plasmoids are very common phenomena downstream of Earth’s quasi-parallel bow shock. As the increase of the dynamic pressure is one of the principal characteristics of magnetosheath jets, the embedded paramagnetic plasmoids have been considered as an special case of the former. Although the properties of both types of structures have been widely studied during the last 20 years, their formation mechanisms have not been examined thoroughly. In this work we perform a 2D local hybrid simulation (kinetic ions – fluid electrons) of a quasi-parallel (θ

Bn
= 15°), supercritical (M

A
= 7) collisionless shock in order to study these mechanisms. Specifically, we analyze the formation of one jet and one plasmoid, showing for the first time that they can be produced by different mechanisms related to the same shock. In our simulation, the magnetosheath jet is formed according to the mechanism proposed by Hietala, where at the shock ripples the upstream solar wind suffers locally less deceleration and the flow is focused in the downstream side, producing a compressed and high-velocity region that leads to an increase of dynamic pressure downstream of the shock. The formation of the plasmoid, however, follows a completely new scenario being generated by magnetic reconnection between two plasma layers with opposite B-field orientation in the region just behind the shock.
Effect of nest microclimate temperatures on metabolic rates of small carpenter bees, Ceratina calcarata (Hymenoptera: Apidae)
Authors: Richards Miriam H. , Cardama Garate Andrea , Shehata Mary , Groom Derrick , Tattersall Glenn J. , Welch Kenneth C. 
Published: August 2020

AbstractSmall carpenter bees (Ceratina calcarata Robertson) (Hymenoptera: Apidae) build their nests in both sunny and shady sites, so maternal decisions about nest sites influence the thermal environment experienced by juveniles throughout development. A previous study demonstrated that when larvae and pupae were raised in the laboratory at room temperature, those from sunny nests developed more slowly than those from shady nests. This suggested that bees developing in sunny nests slowed their metabolism or that bees developing in shady nests increased their metabolism. To test this hypothesis, we performed a field experiment in which bees nested in full sun, full shade, or semi-shade. We brought larvae and pupae into the laboratory to be raised to adulthood at room temperature and measured their metabolic rates (VCO2) at 10 °C, 25 °C, and 40 °C. As expected, bees had higher VCO2 at higher test temperatures, but significant interaction also occurred between test temperature and field treatment, such that bees from sunny nests exhibited higher metabolic rates at 40 °C. Because small carpenter bees frequently nest in full sun, adaptation to high nest temperatures may involve activation of thermal protection mechanisms at the cost of slower development.
Dengue Virus Degrades USP33–ATF3 Axis via Extracellular Vesicles to Activate Human Microglial Cells
Authors: Mishra Ritu , Lahon Anismrita , Banerjea Akhil C. 
Published: August 2020

Abstract
Dengue virus (DENV) infection disrupts host innate immune signaling at various checkpoints. Cellular levels and stability of intermediate signaling molecules are a crucial hijacking point for a successful viral pathogenesis. Stability and turnover of all the cellular proteins including intermediate signaling molecules are principally regulated by proteasomal degradation pathway. In this study, we show that how DENV infection and particularly DENV-NS1 can modulate the host extracellular vesicle (EV) cargo to manipulate the deubiquitination machinery of the human microglial cell (CHME3). We have performed EV harvesting, size analysis by nanoparticle tracking analysis, identification of cargo microRNA via quantitative PCR, microRNA target validation by overexpression, and knockdown via mimics and anti-miRs, immunoblotting, dual luciferase reporter assay, in vivo ubiquitination assay, chase assay, and promoter activity assay to reach the conclusion. In this study, we show that DENV-infected monocytes and DENV-NS1–transfected cells release high amounts of EVs loaded with miR-148a. These EVs get internalized by human microglial cells, and miR-148a suppresses the ubiquitin-specific peptidase 33 (USP33) protein expression levels via binding to its 3′ untranslated region. Reduced USP33 in turn decreases the stability of cellular ATF3 protein via deubiquitylation. ATF3 acts as a suppressor of major proinflammatory gene expression pathways of TNF-α, NF-κB, and IFN-β. Our mechanistic model explains how DENV uses the EV pathway to transfer miR-148a for modulating USP33 and downstream ATF3 levels in human microglial cells and contributes in neuroinflammation within the CNS.
Book Review: A Practitioner’s Reflections in Response to ‘Human Rights Law and the Marginalized Other’
Authors: Gimbad Petra 
Published: August 2020

This book review will have little theoretical grounds on political philosophy. Therefore, given my ability to critique Simmons’ interpretations of various philosophers is limited, I write this review from the perspective of a human rights practitioner seeking a reader to understand how contemporary philosophy may be used to interpret the practices of human rights in contemporary world .
This review will focus on the questions that were raised in the course of reading the book. With reference to thinkers in particular, I hav e chosen to mention a little more on Hanna Arendt and Spivak, whom I tried to acquaint myself with, when I had the time in the past. I fully admit that much of my analysis may lack and hope that readers will not be prevented from discovering these philosophers on their own terms.
Content and Language Integrated Learning: Potential and Obstacles of Its Implementation in Russia
Authors: Sidorenko Tatyana , Kudryashova Alexandra 
Published: August 2020

Reforms and initiatives applied to the field of Russian higher education during the past decade focus particularly on extending the scope of communicative educational space and scientific fields integration. Consequently, linguistic competence contributing to significant acceleration of the processes of globalization and internationalization of the society as a whole becomes the key component of higher professional education. It is necessary to ascertain that the current system of language education in Russian universities fails to deal with the tasks in hand comprehensively. The search for more efficient didactical tools and ways of organizing teaching processes culminated in choosing the paradigm of integrated education, specifically, integration of subject knowledge and foreign language. This approach is well-renowned in scientific and educational literature as CLIL (Content and Language Integrated Learning).
The major objective of the present article is to analyze the current attempts of implementing CLIL in Russian Universities through the example of Tomsk Polytechnic University. The analysis comprises the effectiveness of CLIL didactic capacity, the prerequisites for its emergence as well as needs and challenges in the system of Russian higher education and intellectual labor market. As a conclusion, we offer a systematic list of measures that tend to improve the situation.
Pre-Translation Text Analysis as an Essential Step to an Effective Translation
Authors: Gasparyan Gayane 
Published: August 2020

Pre-translation text analysis is an integral part of an efficient translation procedure. In fact, it focuses on collecting intra-textual and extra-textual information on the text under translation. Collecting the intra-textual information is mainly based on a thorough analysis of the source text linguistic peculiarities, whereas the extra-textual information focuses basically on the communicative functional properties of both source and target texts. There exist different approaches towards this procedure and the stages of its accomplishment. Nonetheless, it should be noted that they all lead to a broader spectrum of discourse analysis with its intra-textual and extra-textual parameters and give birth to the translation-oriented pragmatic analysis before initiating translation process itself.
The article focuses on the interrelation and interaction of all the mentioned types of analysis (pragmatic analysis, discourse analysis, pre-translation analysis) as an essential requirement for a relevant translation.
Mar Pérez Morillo, Directora de la División de Procesos y Servicios Digitales de la BNE
Authors: Morales Sanabria Carmen 
Published: August 2020

Mar Pérez Morillo es doctora en Latín y ha sido profesora de Filología Clásica en la Universidad de Cádiz durante seis años.
Trabaja en la Biblioteca Nacional de España desde 2003, donde ha sido responsable de la web institucional y de las redes sociales de la Biblioteca. En 2009 se hizo cargo del Archivo de la Web Española y del Depósito Legal Electrónico.
Medium- to long-term clinical and functional outcomes of isolated and combined subscapularis tears repaired arthroscopically
Authors: Cigolotti Augusto , Biz Carlo , Lerjefors Erik , de Iudicibus Gianfranco , Belluzzi Elisa , Ruggieri Pietro 
Published: August 2020

IntroductionThe purpose of this study was twofold. First, the efficacy of arthroscopic repair in patients with full thickness, isolated subscapularis tendon tears (I-STTs) or combined subscapularis tendon tears (C-STTs) involving the rotator cuff tendons was evaluated. Second, the outcomes between these two groups were compared. The influence of age and gender on the cohort clinical outcomes was also analysed. Our hypothesis was that satisfactory functional results could be obtained arthroscopically in both groups without any influence of age or gender.Material and methodsSeventy-nine patients were enrolled: 15 with I-STTs and 64 with C-STTs. The clinical outcomes were assessed using Constant and Disabilities of the Arm, Shoulder and Hand (DASH) scores, Numeric Rating Scale (NRS) for pain and Visual Analogue Scale (VAS) for satisfaction. The subscapularis strength was assessed using a comparative dynamometric bear-hug test. Group outcomes were compared, including statistical analysis.ResultsFor each group, there were no differences regarding the subscapularis strength of the operated and non-operated shoulders. A comparison of the post- with the pre-operative outcomes showed an increase in the Constant score and a decrease in the NRS. Comparing the two groups, we found no difference in strength of the operated and non-operated shoulders, but a significant difference in relation to pre-operative Constant score and pre-operative NRS. Age was negatively correlated with both pre-operative and post-operative Constant scores. No association was found between gender and the outcomes, although the DASH score was higher in women.ConclusionsArthroscopic repair of STTs provided functional restoration, pain relief and patient satisfaction in both groups. Age and gender did not affect the clinical outcomes achieved by arthroscopic STT repair.