bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Continued Need for the Routine Assessment of Folate Status
Authors: Osa-Andrews Bremansu , Sanchez Melissa , Hashim Ibrahim A 
Published: January 2023

Abstract

Objective
The Choosing Wisely initiative recommended cessation of folate measurement, suggesting folate supplementation in macrocytic anemia. This study reviewed the need for continued blood folate testing at a large SafetyNet county teaching hospital.

Methods
Red blood cell (RBC) folate, vitamin B12, iron, ferritin, and hemoglobin results were obtained for utilization review.

Results
Of the 593 RBC folate results, 69 (11.7%) were deficient and 30 (5%) had high values. Collectively, 369 (73.9%) had normal vitamin B12 levels, 342 (70%) had low hemoglobin, 184 (62.5) had normal and 57 (19.4%) had low ferritin, 122 (38.2%) had normal and 188 (59%) had low iron levels. A total of 41 (12%) had normal folate, low ferritin, low hemoglobin, and low iron, suggestive of iron deficiency anemia. There were 11 patients who exhibited low folate, low or normal ferritin, low hemoglobin, and low iron levels, suggesting combined folate and iron deficiency anemias.

Conclusion
This study highlights the need for institutions to assess the applicability of national recommendations to their local population.
Some stylometric remarks on Ovid’sHeroidesand theEpistula Sapphus
Authors: Nagy Benjamin 
Published: January 2023

AbstractThis article contributes to two well-worn areas of debate in classical Latin philology, relating to Ovid’s Heroides. The first is the question of the authenticity (and, to a lesser extent the correct position) of the letter placed 15th in almost every collection—the so-called Epistula Sapphus (henceforth ES). The secondary question, although perhaps now less fervently debated, is the authenticity of the ‘Double Heroides’, placed by those who accept them as letters 16–21. I employ a variety of methods drawn from the domain of computational stylometry to consider the poetics and the lexico-grammatical features of these elegiac poems in the broader context of a corpus of ‘shorter’ (from 20 to 546 lines) elegiac works from five authors (266 poems in all) representing most of classical elegy. Based on a variety of techniques, every measure gives clear indication that the poetic style of the Heroides is genuinely Ovidian, but distinctive; they can be accurately isolated from Ovid more broadly. The Single and Double Heroides split into two clear groups, with the ES grouped consistently with the single letters. Furthermore, by comparing the style of the letters with the ‘early’ (although there are complications in this label) works of the Amores and the late works of the Ex Ponto, the evidence supports sequential composition—meaning that the ES is correctly placed—and, further, supports the growing consensus that the double letters were composed significantly later, in exile.
Mental capacity—why look for a paradigm shift?
Authors: Ruck Keene Alex , Kane Nuala B , Kim Scott Y H , Owen Gareth S 
Published: January 2023

ABSTRACT
Challenges to the legitimacy of mental capacity over the past 10 years have been spearheaded by the Committee on the Rights of Persons with Disabilities, the treaty body for the UN Convention on the Rights of Persons with Disabilities (CRPD). This challenge has been asserted to have produced a ‘paradigm shift’. In this article, we examine why that interpretation has had such limited traction in the legal policy arena, and whether it should have traction. We also analyse whether the Committee has subtly but importantly shifted its position. We then develop an argument that the true goal, compatible with the CRPD, is the satisfactory determination of whether a person has or lacks mental capacity to make or take a relevant decision. Our article contextualises multi-disciplinary, research-informed guidelines designed as a contribution to satisfactory determination. While our article is based upon the position in England and Wales, we suggest that our conclusions are of wider application.
Spatially resolved properties of the ionized gas in the H ii galaxy J084220+115000
Authors: Fernández-Arenas D , Carrasco E , Terlevich R , Terlevich E , Amorín R , Bresolin F , Chávez R , González-Morán A L , Rosa-González D , Mayya Y D , Vega O , Zaragoza-Cardiel J , Méndez-Abreu J , Izazaga-Pérez R , Gil de Paz A , Gallego J , Iglesias-Páramo J , García-Vargas M L , Gómez-Alvarez P , Castillo-Morales A , Cardiel N , Pascual S , Pérez-Calpena A 
Published: January 2023

ABSTRACT
We present a spatially resolved spectroscopic study for the metal poor H ii galaxy J084220+115000 using MEGARA Integral Field Unit observations at the Gran Telescopio Canarias. We estimated the gas metallicity using the direct method for oxygen, nitrogen, and helium and found a mean value of 12 + log (O/H) = 8.03 ± 0.06, and integrated electron density and temperature of ∼161 cm−3 and ∼15400 K, respectively. The metallicity distribution shows a large range of Δ(O/H) = 0.72 dex between the minimum and maximum (7.69 ± 0.06 and 8.42 ± 0.05) values, unusual in a dwarf star-forming galaxy. We derived an integrated log (N/O) ratio of −1.51 ± 0.05 and found that both N/O and O/H correspond to a primary production of metals. Spatially resolved maps indicate that the gas appears to be photoionized by massive stars according to the diagnostic line ratios. Between the possible mechanisms to explain the starburst activity and the large variation of oxygen abundance in this galaxy, our data support a possible scenario where we are witnessing an ongoing interaction triggering multiple star-forming regions localized in two dominant clumps.
Closed field line vortices in planetary magnetospheres
Authors: Nemeth Zoltan 
Published: January 2023

ABSTRACTIn a rotation-dominated magnetosphere, there is a region where closed field lines rotate around the planet, and also a region where the open field lines stretch away from the planet, forming the lobes of the magnetotail. This paper shows that there could be a third, significantly different region, where the closed field lines form twisted vortex structures anchored in the magnetotail. Such patterns form when there are significant plasma sources inside the magnetosphere and the time-scale of the plasmoid formation process is substantially larger than the planetary rotation period. In the presence of vortices, the Dungey and Vasyliunas cycles act differently. The Dungey flow does not penetrate the central region of the polar cap. Tail reconnection events are rare, thus leaving the plasma time enough to participate in the essentially 3D vortex-forming plasma motion. The above conditions are fulfilled for Saturn. We discovered vortex-like patterns in the plasma and magnetic field data measured by the Cassini spacecraft in the nightside magnetosphere of Saturn. The plasma whirling around in these vortices never reaches the dayside, instead, it performs a retrograde motion in the high latitude regions of the magnetotail. Low-energy plasma data suggest that the observed patterns correspond to the closed field line vortices.
Distribution and dynamics of decimetre-sized dust agglomerates in the coma of 67P/Churyumov–Gerasimenko
Authors: Lemos Pablo , Agarwal Jessica , Schröter Matthias 
Published: January 2023

ABSTRACTWe present a method to analyse images of the coma of 67P/Churyumov–Gerasimenko obtained using OSIRIS, the main imaging system on-board Rosetta, where dust aggregates can be seen as bright tracks because of their relative velocity with respect to the spacecraft. We applied this method to 105 images taken in 2015 July, 2015 December, and 2016 January, identifying more than 20 000 individual objects. We performed a photometric analysis of them, finding their phase function. This phase function follows the same trend as the one found for the nucleus, consistent with the detected particles having a size larger than ∼1 mm. Additionally, the phase function becomes shallower for increasing heliocentric distances, indicating a decrease in the mean agglomerate size. In order to characterize the agglomerates observed in the image, we developed a simplified model for their ejection and dynamics in the coma, and generated synthetic images based on it. We solved the inverse problem by finding the simulation parameters that give the best fit between synthetic and real images. In doing so, we were able to obtain a mean agglomerate size ∼ dm and initial speed ≃ 1 m s−1. Both show a decrease with increasing heliocentric distance, sign of the reduction in activity. Also, the sizes obtained by the comparison are not compatible with ejection caused by water activity, so other sources have to be invoked, mainly CO2.
Bending the rules of PAH hydrogenation: the case of corannulene
Authors: Leccese Mirko , Jaganathan R , Slumstrup L , Thrower J D , Hornekær L , Martinazzo R 
Published: January 2023

ABSTRACT
The interaction of a curved polycyclic aromatic hydrocarbon (PAH), corannulene (C20H10), with H-atoms leading to the formation of highly superhydrogenated species was studied. In particular, we determined the H-atom addition sequence to a monolayer of corannulene deposited on a graphite surface in order to understand the effect of curvature on the interaction of PAHs with H-atoms. We also investigated why superhydrogenated corannulene species with a certain number of additional H-atoms are more stable than the others. A combination of thermal desorption mass spectrometry measurements and density functional theory calculations was used to reveal and understand the presence of the most stable configurations in the superhydrogenation sequence of corannulene. Specifically, the experiments demonstrate the presence of stable configurations of superhydrogenated corannulene at specific hydrogenation levels of 2, 6, 8, 10, 12, 14, 16, 17, and 18 extra H-atoms. Density functional theory calculations of binding energies and barrier heights explain why some of these configurations are particularly stable and provide new insights into the superhydrogenation of curved PAH molecules under interstellar conditions.
Wideband study of the brightest black hole X-ray binary 4U 1543−47 in the 2021 outburst: signature of disc-wind regulated accretion
Authors: Prabhakar Geethu , Mandal Samir , Bhuvana G R , Nandi Anuj 
Published: January 2023

ABSTRACT
A comprehensive wideband spectral analysis of the brightest black hole X-ray binary 4U 1543−47 during its 2021 outburst is carried out for the first time using NICER, NuSTAR, and AstroSat observations by phenomenological and reflection modelling. The source attains a super-Eddington peak luminosity and remains in the soft state, with a small fraction ($\lt 3{{\ \rm per\ cent}}$) of the inverse-Comptonized photons. The spectral modelling reveals a steep photon index (Γ ∼ 2–2.6) and relatively high inner disc temperature (Tin ∼ 0.9–1.27 keV). The line-of-sight column density varies between (0.45–0.54) × 1022 cm−2. Reflection modelling using the RELXILL model suggests that 4U 1543−47 is a low-inclination system (θ ∼ 32°–40°). The accretion disc is highly ionized (log ξ &gt; 3) and has super solar abundance (3.6–10 AFe,⊙) over the entire period of study. We detected a prominent dynamic absorption feature between ∼8 and 11 keV in the spectra throughout the outburst. This detection is the first of its kind for X-ray binaries. We infer that the absorption of the primary X-ray photons by the highly ionized, fast-moving disc winds can produce the observed absorption feature. The phenomenological spectral modelling also shows the presence of a neutral absorption feature ∼7.1–7.4 keV, and both ionized and neutral absorption components follow each other with a delay of a typical viscous time-scale of 10–15 d.
Exploring bulk viscous unified scenarios with gravitational waves standard sirens
Authors: Yang Weiqiang , Pan Supriya , Valentino Eleonora Di , Escamilla-Rivera Celia , Paliathanasis Andronikos 
Published: January 2023

ABSTRACT
We consider the unified bulk viscous scenarios and constrain them using the Cosmic Microwave Background observations from Planck 2018 and the Pantheon sample from Type Ia supernovae. Then we generate the luminosity distance measurements from ${\cal O}(10^3)$ mock Gravitational Wave Standard Sirens (GWSS) events for the proposed Einstein Telescope. We then combine these mock luminosity distance measurements from the GWSS with the current cosmological probes in order to forecast how the mock GWSS data could be effective in constraining these bulk viscous scenarios. Our results show that a non-zero time dependent bulk viscosity in the universe sector is strongly preferred by the current cosmological probes and will possibly be confirmed at many standard deviations by the future GWSS measurements. We further mention that the addition of GWSS data can significantly reduce the uncertainties of the key cosmological parameters obtained from the usual cosmological probes employed in this work.
Equilibrium points of heterogeneous small body in finite element method
Authors: Wen Tongge , Zeng Xiangyuan 
Published: January 2023

ABSTRACT
This paper presents a finite element method to search for equilibrium points around a heterogeneous small body, which degenerates from the full two-body problem in finite element form. The gravitational potential, acceleration, gravitational gradient matrix, and the linearized perturbation equation, which are key formulas for solving the equilibrium points and discriminating their stabilities, are interpolated by the tetrahedral model nodes of the small body. The finite element method could capture the complex internal structures of small bodies and provide a uniform and simple formula for various configurations. The method is applied to the Kuiper Belt Object (486958) Arrokoth, which is a contact binary asteroid. Three types of heterogeneous structures are hypothesized to investigate the evolutions of equilibrium points, namely density disparity of two sub-lobes, hardcore structure, and cavity structure. Under the condition of constant Arrokoth mass, the density disparity of the two sub-lobes greatly influences the local gravitational field. It thus has a significant influence on the positions of equilibrium points. The hardcore and cavity structures have less impact on the equilibrium points. These three simulation groups verified that the equilibrium points of a heterogeneous small body are quite different from those of a homogeneous small body. Such investigation of the equilibrium points may give an in-depth understanding of the dynamical environment around the heterogeneous small body, which is significant for future deep-space missions.
Persistent topology of the reionization bubble network – II. Evolution and classification
Authors: Elbers Willem , van de Weygaert Rien 
Published: January 2023

AbstractWe study the topology of the network of ionized and neutral regions that characterized the intergalactic medium during the Epoch of Reionization. Our analysis uses the formalism of persistent homology, which offers a highly intuitive and comprehensive description of the ionization topology in terms of the births and deaths of topological features. Features are identified as k-dimensional holes in the ionization bubble network, whose abundance is given by the kth Betti number: β0 for ionized bubbles, β1 for tunnels, and β2 for neutral islands. Using semi-numerical models of reionization, we investigate the dependence on the properties of sources and sinks of ionizing radiation. Of all topological features, we find that the tunnels dominate during reionization and that their number is easiest to observe and most sensitive to the astrophysical parameters of interest, such as the gas fraction and halo mass necessary for star formation. Seen as a phase transition, the importance of the tunnels can be explained by the entanglement of two percolating clusters and the fact that higher-dimensional features arise when lower-dimensional features link together. We also study the relation between the morphological components of the bubble network (bubbles, tunnels, and islands) and those of the cosmic web (clusters, filaments, and voids), describing a correspondence between the k-dimensional features of both. Finally, we apply the formalism to mock observations of the 21-cm signal. Assuming 1000 observation hours with HERA Phase II, we show that astrophysical models can be differentiated and confirm that persistent homology provides additional information beyond the power spectrum.
Extended corona models of X-ray reverberation in the AGN 1H 0707−495 and IRAS 13224−3809
Authors: Hancock S , Young A J , Chainakun P 
Published: January 2023

ABSTRACTWe fit a new vertically extended corona model to previously measured reverberation time lags observed by XMM–Newton in two extremely variable narrow-line Seyfert 1 active galactic nuclei, 1H 0707−495 and IRAS 13224−3809, in a variety of similarly observed flux groups and explore the model in all observations over a 16 yr period. The model employs two X-ray sources located along the black hole rotational axis at height, h1 and h2, respectively. These sources have their associated photon indices Γ1 and Γ2 which respond to fluctuations in the disc with a maximum response duration of tmax and a propagation delay between the response of the two of tshift. We find that for 1H 0707−495, h2 is significantly correlated with Γ1 and anticorrelated with ionization ξ. Whilst the 1H 0707−495 corona extends upwards, the emission appears softer and the disc is less ionized. We find similarities in IRAS 13224−3809, but significant anticorrelation between Γ2 and both tmax and tshift. This suggests that when the IRAS 13224−3809 corona becomes softer while extending vertically upwards, the overall corona response occurs faster. This may also suggest that the inner disc also becomes more active. In addition, Γ1 and Γ2 are extreme, relatively less variable, but more separate in IRAS 13224−3809 than in 1H 0707−495. This suggests that the IRAS 13224−3809 corona may be more patchy in the sense that it has two more clear distinct spectral zones of Γ1 and Γ2 (possibly relating to two distinct zones of coronal temperature) when compared to 1H 0707−495.
Magnetohydrodynamic stability of magnetars in the ultrastrong field regime – II. The crust
Authors: Rau Peter B , Wasserman Ira 
Published: January 2023

ABSTRACT
We study the stability of Hall magnetohydrodynamic with strong magnetic fields in which Landau quantization of electrons is important. We find that the strong-field Hall modes can be destabilized by the dependence of the differential magnetic susceptibility on magnetic field strength. This hydrodynamic instability, thermodynamic in origin and stabilized by magnetic domain formation, is studied using linear perturbation theory. It is found to have typical growth time of order ≲103 yr, with the growth time decreasing as a function of wavelength of the perturbation. The instability is self-limiting, turning off following a period of local field growth by a few per cent of the initial value. Finite temperature is also shown to limit the instability, with sufficiently high temperatures eliminating it altogether. Alfvén waves can show similar unstable behaviour on shorter time-scales. We find that Ohmic heating due to the large fields developed via the instability and magnetic domain formation is not large enough to account for observed magnetar surface temperatures. However, Ohmic heating is enhanced by the oscillatory differential magnetic susceptibility of Landau-quantized electrons, which could be important to magnetothermal simulations of neutron star crusts.
Rotational modulation in A and F stars: magnetic stellar spots or convective core rotation?
Authors: Henriksen Andreea I , Antoci Victoria , Saio Hideyuki , Cantiello Matteo , Kjeldsen Hans , Kurtz Donald W , Murphy Simon J , Mathur Savita , García Rafael A , Santos Ângela R G 
Published: January 2023

ABSTRACT
The Kepler mission revealed a plethora of stellar variability in the light curves of many stars, some associated with magnetic activity or stellar oscillations. In this work, we analyse the periodic signal in 162 intermediate-mass stars, interpreted as Rossby modes and rotational modulation – the so-called hump and spike feature. We investigate whether the rotational modulation (spike) is due to stellar spots caused by magnetic fields or due to Overstable Convective (OsC) modes resonantly exciting g modes, with frequencies corresponding to the convective core rotation rate. Assuming that the spikes are created by magnetic spots at the stellar surface, we recover the amplitudes of the magnetic fields, which are in good agreement with theoretical predictions. Our data show a clear anticorrelation between the spike amplitudes and stellar mass and possibly a correlation with stellar age, consistent with the dynamo-generated magnetic fields theory in (sub)-surface convective layers. Investigating the harmonic behaviour, we find that for 125 stars neither of the two possible explanations can be excluded. While our results suggest that the dynamo-generated magnetic field scenario is more likely to explain the spike feature, we assess further work is needed to distinguish between the two scenarios. One method for ruling out one of the two explanations is to directly observe magnetic fields in hump and spike stars. Another would be to impose additional constraints through detailed modelling of our stars, regarding the rotation requirement in the OsC mode scenario or the presence of a convective-core (stellar age).
Magnetohydrodynamic Kelvin–Helmholtz instabilities of supersonic shear layers with finite interface thickness and heat flux in anisotropic space plasmas
Authors: Dzhalilov N S , Ismayilli R 
Published: January 2023

ABSTRACTThe linear magnetohydrodynamic Kelvin–Helmholtz instability (KHI) in an anisotropic plasma is studied. The governing equations obtained as the 16 moments of Boltzmann–Vlasov kinetic equations, including the heat flow, are applied. In the case of tangential discontinuity between the supersonic flows along the magnetic field, the calculated growth rates as functions of the anisotropic plasma properties allow us to conclude that quasi-transverse modes grow faster. Then, dispersion equations for the KHI of quasi-transverse modes are derived, considering the finite width of the transition zone with different velocity profiles. For these modes, when the role of heat flow is not important, the plasma parameters are controlled so that the fundamental plasma instabilities (firehose and mirror) do not affect the KHI. The problem is solved analytically, which will be helpful in verifying numerical simulations. In contrast to the tangential discontinuity, the finite width of the transition layer confines KHI excitation as the wavenumber increases. In the general case of oblique propagation (when heat flux complicates the problem), the boundary value problem is solved to determine the spectral eigenvalues. In particular, it is observed that the fundamental plasma instabilities that arise in the transition zone between flows with a finite width can modify and considerably enhance the KHI.