bluuebunny/crossref_metadata_2025_split huggingface dataset:
The ultranarrow FRB20191107B, and the origins of FRB scattering
Authors: Gupta V , Flynn C , Farah W , Bailes M , Deller A T , Day C K , Lower M E 
Published: June 2022

ABSTRACTWe report the detection of FRB20191107B with UTMOST radio telescope at a dispersion measure (DM) of 714.9 pc cm−3. The burst consists of three components, the brightest of which has an intrinsic width of only 11.3 μs and a scattering tail with an exponentially decaying time-scale of 21.4 μs measured at 835 MHz. We model the sensitivity of UTMOST and other major fast radio burst (FRB) surveys to such narrow events. We find that $\gt 60{{\ \rm per\, cent}}$ of FRBs like FRB20191107B are being missed, and that a significant population of very narrow FRBs probably exists and remains underrepresented in these surveys. The high DM and small scattering time-scale of FRB20191107B allows us to place an upper limit on the strength of turbulence in the intergalactic medium, quantified as scattering measure (SM), of SMIGM &lt; 8.4 × 10−7 kpc m−20/3. Almost all UTMOST FRBs have full phase information due to real-time voltage capture, which provides us with the largest sample of coherently dedispersed single burst FRBs. Our 10.24 μs time resolution data yields accurately measured FRB scattering time-scales. We combine the UTMOST FRBs with 10 FRBs from the literature and find no obvious evidence for a DM-scattering relation, suggesting that IGM is not the dominant source of scattering in FRBs. We support the results of previous studies and identify the local environment of the source in the host galaxy as the most likely region that dominates the observed scattering of our FRBs.
The PAU survey: measurements of the 4000 Å spectral break with narrow-band photometry
Authors: Renard Pablo , Siudek Malgorzata , Eriksen Martin B , Cabayol Laura , Cai Zheng , Carretero Jorge , Casas Ricard , Castander Francisco J , Fernandez Enrique , García-Bellido Juan , Gaztanaga Enrique , Hoekstra Henk , Joachimi Benjamin , Miquel Ramon , Navarro-Girones David , Padilla Cristóbal , Sanchez Eusebio , Serrano Santiago , Tallada-Crespí Pau , De Vicente Juan , Wittje Anna , Wright Angus H 
Published: June 2022

ABSTRACT
The D4000 spectral break index is one of the most important features in the visible spectrum, as it is a proxy for stellar ages and is also used in galaxy classification. However, its direct measurement has always been reserved to spectroscopy. Here, we present a general method to directly measure the D4000 with narrow-band (NB) photometry; it has been validated using realistic simulations, and then evaluated with PAUS NBs, cross-matched with VIPERS spectra (iAB &lt; 22.5, 0.562 &lt; z &lt; 0.967). We also reconstruct the D4000 with the SED-fitting code cigale; the use of PAUS NBs instead of broad-bands significantly improves the SED fitting results. For D4000n, the direct measurement has $\rm \langle SNR \rangle \sim 4$, but we find that for iAB &lt; 21 all direct D4000 measurements have $\rm SNR\gt 3$. The cigale D4000n has $\rm \langle SNR \rangle \sim 20$, but underestimates the error by &gt;50 per cent. Furthermore, the direct method recreates well the D4000–SFR relation, as well as the D4000–mass relation for blue galaxies (for red galaxies, selection effects impact the results). On the other hand, cigale accurately classifies galaxies into red and blue populations. We conclude that the direct measurement of D4000 with narrow-band photometry is a promising tool to determine average properties of galaxy samples, with results compatible with spectroscopy.
The importance of silicate vapour in determining the structure, radii, and envelope mass fractions of sub-Neptunes
Authors: Misener William , Schlichting Hilke E 
Published: June 2022

ABSTRACT
Substantial silicate vapour is expected to be in chemical equilibrium at temperature conditions typical of the silicate–atmosphere interface of sub-Neptune planets, which can exceed 5000 K. Previous models of the atmospheric structure and evolution of these exoplanets, which have been used to constrain their atmospheric mass fractions, have neglected this compositional coupling. In this work, we show that silicate vapour in a hydrogen-dominated atmosphere acts as a condensable species, decreasing in abundance with altitude. The resultant mean molecular weight gradient inhibits convection at temperatures above ∼4000 K, inducing a near-surface radiative layer. This radiative layer decreases the planet’s total radius compared to a planet with the same base temperature and a convective, pure H/He atmosphere. Therefore, we expect silicate vapour to have major effects on the inferred envelope mass fraction and thermal evolution of sub-Neptune planets. We demonstrate that differences in radii, and hence in inferred atmospheric masses, are largest for planets which have larger masses, equilibrium temperatures, and atmospheric mass fractions. The effects are largest for younger planets but differences can persist on gigayear time-scales for some sub-Neptunes. For a 10 M⊕ planet with Teq = 1000 K and an age of ∼300 Myr, an observed radius consistent with an atmospheric mass fraction of 10 per cent when accounting for silicate vapour would be misinterpreted as indicating an atmospheric mass fraction of 2 per cent if an H/He-only atmosphere were assumed. The presence of silicate vapour in the atmosphere is also expected to have important implications for the accretion and loss of primordial hydrogen atmospheres.
Dissipation of hydromagnetic waves in the viscous polytropic zone of the solar wind including FLR corrections, ohmic diffusion, and the Hall effect
Authors: Prajapati Ram Prasad , Desta Ephrem Tesfaye , Fok Mei-Ching , Eritro Tigistu Haile 
Published: June 2022

ABSTRACT
In the polytropic zone of the solar wind, we have used the generalized polytrope pressure laws to investigate the dissipation of hydromagnetic waves and pressure-anisotropy-driven fluid instabilities in magnetized viscous plasmas, including finite Larmor radius (FLR) corrections and non-ideal magnetohydrodynamic (MHD) effects. The modified dispersion properties have been analysed in the MHD and Chew–Goldberger–Low (CGL) limits for typical conditions of the solar wind and corona. The theoretical results are found to be in good agreement with the observational data, which shows that the MHD and CGL waves are dissipated due to viscous and ohmic diffusion. The FLR and Hall parameters show destabilizing and stabilizing influences, respectively, for the strong magnetic fields in the solar corona, and reversed effects in the case of weak magnetic fields in the solar wind. In the solar corona, the CGL wave dissipation achieves the required damping rate in the minimum time than the dissipation of the MHD waves. The damping time is mainly associated with the considered parameters and was found to be larger for the MHD wave dissipation than the CGL wave dissipation. The theoretical results successfully demonstrate the role of the considered parameters on the reverse and forward shock waves and instabilities as observed in the solar wind parameters versus heliolatitude graph using Ulysses observations for r = 5.41 au. The results are helpful to explore the possibilities of MHD waves and pressure-anisotropy-driven fluid instabilities in the polytropic zone of the solar wind that will probably be observed by the Parker Solar Probe (PSP) mission.
Evolution of Hen 3-1357, the Stingray Nebula
Authors: Peña Miriam , Parthasarathy Mudumba , Ruiz-Escobedo Francisco , Manick Rajeev 
Published: June 2022

ABSTRACTThe spectroscopic evolution of Hen 3-1357, the Stingray Nebula, is presented by analysing data from 1990 to 2021. High-resolution data obtained in 2021 with South African Large Telescope High Resolution Spectrograph and in 2009 with European Southern Observatory-Very Large Telescope UVES spectrograph are used to determine physical conditions and chemical abundances in the nebula. From comparison of these data with data from different epochs it is found that the intensity of highly ionized emission lines has been decreasing with time, while the emission of low-ionization lines has been increasing, confirming that the nebula is recombining, lowering its excitation class, as a consequence of the changes in the central star which in 2002 had an effective temperature of 60 000 K and from then it has been getting colder. The present effective temperature of the central star is about 40 000 K. It has been suggested that the central star has suffered a late thermal pulse and it is returning to the AGB phase. The nebular chemistry of Hen 3-1357 indicates that all the elements, except He and Ne, present subsolar abundances. The comparison of the nebular abundances with the values predicted by stellar nucleosynthesis models at the end of the AGB phase shows that the central star had an initial mass lower than 1.5 M⊙. We estimated the ADF(O+2) to be between 2.6 and 3.5.
The transcription factor network ofE. colisteers global responses to shifts in RNAP concentration
Authors: L.B. Almeida Bilena , M. Bahrudeen Mohamed N , Chauhan Vatsala , Dash Suchintak , Kandavalli Vinodh , Häkkinen Antti , Lloyd-Price Jason , S.D. Cristina Palma , Baptista Ines S C , Gupta Abhishekh , Kesseli Juha , Dufour Eric , Smolander Olli-Pekka , Nykter Matti , Auvinen Petri , Jacobs Howard T , M.D. Oliveira Samuel , S. Ribeiro Andre 
Published: June 2022

AbstractThe robustness and sensitivity of gene networks to environmental changes is critical for cell survival. How gene networks produce specific, chronologically ordered responses to genome-wide perturbations, while robustly maintaining homeostasis, remains an open question. We analysed if short- and mid-term genome-wide responses to shifts in RNA polymerase (RNAP) concentration are influenced by the known topology and logic of the transcription factor network (TFN) of Escherichia coli. We found that, at the gene cohort level, the magnitude of the single-gene, mid-term transcriptional responses to changes in RNAP concentration can be explained by the absolute difference between the gene's numbers of activating and repressing input transcription factors (TFs). Interestingly, this difference is strongly positively correlated with the number of input TFs of the gene. Meanwhile, short-term responses showed only weak influence from the TFN. Our results suggest that the global topological traits of the TFN of E. coli shape which gene cohorts respond to genome-wide stresses.
Issues regarding COVID-19 in kidney transplantation in the ERA of the Omicron variant: a commentary by the ERA Descartes Working Group
Authors: Gandolfini Ilaria , Crespo Marta , Hellemans Rachel , Maggiore Umberto , Mariat Christophe , Mjoen Geir , Oniscu Gabriel C , Peruzzi Licia , Sever Mehmet Sükrü , Watschinger Bruno , Hilbrands Luuk 
Published: June 2022

ABSTRACT
The Omicron variant, which has become the dominant strain of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) worldwide, brings new challenges to preventing and controlling the infection. Moreover, the widespread implementation of vaccination policies before and after transplantation, and the development of new prophylactic and treatment strategies for coronavirus disease 2019 (COVID-19) over the past 12–18 months, has raised several new issues concerning kidney transplant recipients. In this special report, the ERA DESCARTES (Developing Education Science and Care for Renal Transplantation in European States) Working Group addresses several questions related to everyday clinical practice concerning kidney transplant recipients and to the assessment of deceased and live kidney donors: what is the current risk of severe disease and of breakthrough infection, the optimal management of immunosuppression in kidney transplant recipients with COVID-19, the role of passive immunization and the efficacy of antiviral drugs in ambulatory patients, the management of drug-to-drug interactions, safety criteria for the use of SARS-CoV-2-positive donors, issues related to the use of T cell depleting agents as induction treatment, and current recommendations for shielding practices.
Gapless vortex bound states in superconducting topological semimetals
Authors: Zhang Yi , Qin Shengshan , Jiang Kun , Hu Jiangping 
Published: June 2022

ABSTRACTWe find that the vortex bound states in superconducting topological semimetals are gapless owing to topological massless excitations in their normal states. We demonstrate this universal result in a variety of semimetals, including Dirac and Weyl semimetals, three-fold degenerate spin-1 fermions, spin-3/2 Rarita-Schwinger-Weyl fermion semimetals and other exotic fermion semimetals. The formation of these gapless bound states is closely related to their Andreev specular reflection and propagating Andreev modes in π-phase superconductor-normal metal-superconductor junctions. We further demonstrate that these gapless states are topologically protected and can be derived from a topological pumping process.
E-cigarettes to Augment Stop Smoking In-person Support and Treatment With Varenicline (E-ASSIST): A Pragmatic Randomized Controlled Trial
Authors: Tattan-Birch Harry , Kock Loren , Brown Jamie , Beard Emma , Bauld Linda , West Robert , Shahab Lion 
Published: June 2022

Abstract

Aim
To examine whether, in adults receiving behavioral support, offering e-cigarettes together with varenicline helps more people stop smoking cigarettes than varenicline alone.

Methods
A two-group, parallel arm, pragmatic randomized controlled trial was conducted in six English stop smoking services from 2019–2020. Adults enrolled onto a 12-week programme of in-person one-to-one behavioral smoking cessation support (N  =  92) were randomized to receive either (1) a nicotine e-cigarette starter kit alongside varenicline or (2) varenicline alone. The primary outcome was biochemically verified abstinence from cigarette smoking between weeks 9-to-12 post quit date, with those lost to follow-up considered not abstinent. The trial was stopped early due to COVID-19 restrictions and a varenicline recall (92/1266 participants used).

Results
Nine-to-12-week smoking abstinence rates were 47.9% (23/48) in the e-cigarette-varenicline group compared with 31.8% (14/44) in the varenicline-only group, a 51% increase in abstinence among those offered e-cigarettes; however, the confidence interval (CI) was wide, including the possibility of no difference (risk ratio [RR] = 1.51, 95% CI = 0.91–2.64). The e-cigarette-varenicline group had 43% lower hazards of relapse from continuous abstinence than the varenicline-only group (hazards ratio [HR] = 0.57, 95% CI =  0.34–0.96). Attendance for 12 weeks was higher in the e-cigarette-varenicline than varenicline-only group (54.2% vs. 36.4%; RR = 1.49, 95% CI = 0.95–2.47), but similar proportions of participants in both groups used varenicline daily for ≥8 weeks after quitting (22.9% versus 22.7%; RR = 1.01, 95% CI = 0.47–2.20). Estimates were too imprecise to determine how adverse events differed by group.

Conclusion
Tentative evidence suggests that offering e-cigarettes alongside varenicline to people receiving behavioral support may be more effective for smoking cessation than varenicline alone.

Implications
Offering e-cigarettes to people quitting smoking with varenicline may help them remain abstinent from cigarettes, but the evidence is tentative because our sample size was smaller than planned—caused by Coronavirus Disease 2019 (COVID-19) restrictions and a manufacturing recall. This meant our effect estimates were imprecise, and additional evidence is needed to confirm that providing e-cigarettes and varenicline together helps more people remain abstinent than varenicline alone.
Comparative COVID-19 Vaccine Effectiveness Over Time in Veterans
Authors: Mayr Florian B , Talisa Victor B , Shaikh Obaid S , Omer Saad B , Butt Adeel A , Yende Sachin 
Published: June 2022

Abstract

Background
Comparative effectiveness of coronavirus disease 2019 (COVID-19) vaccines across patient subgroups is poorly understood and essential to precisely targeting vaccination strategies.

Methods
We used the US Department of Veterans Affairs COVID-19 Shared Data Resource to identify veterans who utilize VA health care and had no documented severe acute respiratory syndrome coronavirus 2 infection before December 11, 2020. Using a test-negative case–control design (TND), we used conditional logistic regression with adjustment for covariates to estimate vaccine effectiveness (VE) over time for veterans who received 2 doses of mRNA vaccines or 1 dose of Ad26.Cov2.S.

Results
We identified 4.8 million veterans with a mean age of 64 years, of whom 58% had ≥1 chronic disease. Vaccine effectiveness for symptomatic infections, hospitalizations, and ICU admission or death declined over time and varied by the type of vaccine (P &lt; 0.01). VE estimates against symptomatic infection during months 1 and 7 for mRNA-1273 compared with BNT162b2 were 89.7% (95% CI, 84.4%–93.0%) and 57.3% (95% CI, 48.4%–64.7%) vs 81.6% (95% CI, 75.9%–85.9%) and 22.5% (95% CI, 7.2%–35.2%) for individuals age &lt;65 years and 78.4% (95% CI, 71.1%–83.9%) and 36.2% (95% CI, 27.7%–43.6%) vs 66.3% (95% CI, 55.7%–74.4%) and −23.3% (95% CI, −40.5% to −8.2%) in subjects age ≥65 years; against hospitalization 92.0% (95% CI, 76.1%–97.3%) and 83.1% (95% CI, 66.8%–91.4%) vs 85.6% (95% CI, 72.6%–92.4%) and 57.0% (95% CI, 31.2%–73.2%) in subjects age &lt;65 years and 66.1% (95% CI, 45.3%–79.0%) and 64.7% (95% CI, 55.2%–72.3%) vs 61.0% (95% CI, 41.3%–74.2%) and 1.7% (95% CI, −22.0% to 20.8%) in those age ≥65 years; against ICU admission or death 89.2% (95% CI, 49.5%–97.7%) and 84.4% (95% CI, 59.0%–94.1%) vs 87.6% (95% CI, 61.0%–96.1%) and 66.4% (95% CI, 7.7%–87.8%) in subjects age &lt;65 years and 75.4% (95% CI, 51.7%–87.5%) and 73.8 (95% CI, 62.9%–81.5%) vs 67.4% (95% CI, 32.6%–84.3%) and 29.3% (95% CI, 2.3%–48.9%) in subjects age ≥65 years, respectively (Pinteraction &lt; .01 for all comparisons). Similarly, mRNA-1273 was more effective than BNT162b2 in veterans with &gt;1 chronic disease.

Conclusions
mRNA-1273 was more effective than BNT162b2 in older veterans and those with chronic diseases.
IgM Positivity for Both EBV and CMV: A Clinical Conundrum
Authors: Jhaveri Tulip A , Harris Courtney , Sax Paul E 
Published: June 2022

Abstract
A review of 28 patients who tested positive for both Epstein-Barr virus and cytomegalovirus immunoglobulin M at an academic medical center revealed that dual positivity is more common than previously reported. These cases require careful review of the history and sometimes supplemental testing. This report highlights features of patients with dual positivity and provides recommendations on interpretation of the results.
Dolomitic Marble in a Context of UHT Metamorphism: Possible Signs of Melting, Lenadora Quarry, Sri Lanka
Authors: Martin Robert F , Schumann Dirk , Dharmapriya Prasanna L 
Published: June 2022

Abstract
The Lenadora quarry, located 25 km north of Matale, in central Sri Lanka, exploits dolomitic marble on an artisanal scale. It is located in the Highland Complex but very close to its thrust contact with the Wanni Complex. The rocks have undergone metamorphism to the granulite facies; by analogy with metasedimentary rocks in a similar position south of Kandy, conditions of metamorphism may even have surpassed 900°C and 0.9 GPa. How did dolomitic marble fare in such an ultrahigh-temperature environment? High-resolution large-area image mosaics of imaged polished thin sections were acquired by using both light microscopy and scanning electron microscopy. We focus on fifty areas of interest. As expected, diopside and forsterite porphyroblasts appeared during prograde metamorphism. However, we did not anticipate to see subhedral porphyroblasts of forsterite mimetically replaced by diopside + dolomite. The conversion could have involved a fluid phase or a carbonate melt that had become locally enriched in silica. The presence of a melt accounts for composite calcite + dolomite globules trapped in forsterite. There is no evidence of breakdown products of dolomite, like periclase or brucite. The evidence that a carbonate melt was present is circumstantial; carbonate systems are notorious for erasing telltale evidence of melting. Other minerals encountered in the dolomitic matrix are phlogopite, pargasite, rutile, hydroxylapatite, zirconolite, lakargiite, a magnesiobeltrandoite-like phase, pyrrhotite, and calcite as a minor phase, some of which is of a second generation. Unreplaced relics of forsterite were partially serpentinized at a retrograde stage.
Tracking group identity through natural language within groups
Authors: Ashokkumar Ashwini , Pennebaker James W 
Published: June 2022

Abstract
To what degree can we determine people's connections with groups through the language they use? In recent years, large archives of behavioral data from social media communities have become available to social scientists, opening the possibility of tracking naturally occurring group identity processes. A feature of most digital groups is that they rely exclusively on the written word. Across 3 studies, we developed and validated a language-based metric of group identity strength and demonstrated its potential in tracking identity processes in online communities. In Studies 1a–1c, 873 people wrote about their connections to various groups (country, college, or religion). A total of 2 language markers of group identity strength were found: high affiliation (more words like we, togetherness) and low cognitive processing or questioning (fewer words like think, unsure). Using these markers, a language-based unquestioning affiliation index was developed and applied to in-class stream-of-consciousness essays of 2,161 college students (Study 2). Greater levels of unquestioning affiliation expressed in language predicted not only self-reported university identity but also students’ likelihood of remaining enrolled in college a year later. In Study 3, the index was applied to naturalistic Reddit conversations of 270,784 people in 2 online communities of supporters of the 2016 presidential candidates—Hillary Clinton and Donald Trump. The index predicted how long people would remain in the group (3a) and revealed temporal shifts mirroring members’ joining and leaving of groups (3b). Together, the studies highlight the promise of a language-based approach for tracking and studying group identity processes in online groups.