bluuebunny/crossref_metadata_2025_split huggingface dataset:
SkyHopper mission science case I: Identification of high redshift Gamma-Ray Bursts through space-based near-infrared afterglow observations
Authors: Thomas M. , Trenti M. , Greiner J. , Skrutskie M. , Forbes Duncan A. , Klose S. , Mack K. J. , Mearns R. , Metha B. , Skafidas E. , Tagliaferri G. , Tanvir N. 
Published: August 2022

Abstract
Long-duration gamma-ray burst (GRB) afterglow observations offer cutting-edge opportunities to characterise the star formation history of the Universe back to the epoch of reionisation, and to measure the chemical composition of interstellar and intergalactic gas through absorption spectroscopy. The main barrier to progress is the low efficiency in rapidly and confidently identifying which bursts are high redshift (

$z > 5$

) candidates before they fade, as this requires low-latency follow-up observations at near-infrared wavelengths (or longer) to determine a reliable photometric redshift estimate. Since no current or planned gamma-ray observatories carry near-infrared telescopes on-board, complementary facilities are needed. So far this task has been performed by instruments on the ground, but sky visibility and weather constraints limit the number of GRB targets that can be observed and the speed at which follow-up is possible. In this work we develop a Monte Carlo simulation framework to investigate an alternative approach based on the use of a rapid-response near-infrared nano-satellite, capable of simultaneous imaging in four bands from

$0.8$

to

$1.7\,\unicode{x03BC}$

m (a mission concept called SkyHopper). Using as reference a sample of 88 afterglows observed with the GROND instrument on the MPG/ESO telescope, we find that such a nano-satellite is capable of detecting in the H-band (1.6

$\unicode{x03BC}$

m)

$72.5\% \pm 3.1\%$

of GRBs concurrently observable with the Swift satellite via its UVOT instrument (and

$44.1\% \pm 12.3\%$

of high redshift (

$z>5$

) GRBs) within 60 min of the GRB prompt emission. This corresponds to detecting

${\sim}55$

GRB afterglows per year, of which 1–3 have

$z > 5$

. These rates represent a substantial contribution to the field of high-z GRB science, as only 23

$z > 5$

GRBs have been collectively discovered by the entire astronomical community over the last

${\sim}24$

yr. Future discoveries are critically needed to take advantage of next generation follow-up spectroscopic facilities such as 30m-class ground telescopes and the James Webb Space Telescope. Furthermore, a systematic space-based follow-up of afterglows in the near-infrared will offer new insight on the population of dusty (‘dark’) GRBs which are primarily found at cosmic noon (

$z\sim 1-3$

). Additionally, we find that launching a mini-constellation of 3 near-infrared nano-satellites would increase the detection fraction of afterglows to

${\sim}83\%$

and substantially reduce the latency in the photometric redshift determination.
Multi-layered characterisation of hot stellar systems with confidence
Authors: Chattopadhyay Souradeep , Kawaler Steven D. , Maitra Ranjan 
Published: August 2022

Abstract
Understanding the physical and evolutionary properties of Hot Stellar Systems (HSS) is a major challenge in astronomy. We studied the dataset on 13 456 HSS of Misgeld & Hilker (2011, MNRAS, 414, 3 699) that includes 12 763 candidate globular clusters using stellar mass (

$M_s$

), effective radius (

$R_e$

) and mass-to-luminosity ratio (

$M_s/L_\nu$

), and found multi-layered homogeneous grouping among these stellar systems. Our methods elicited eight homogeneous ellipsoidal groups at the finest sub-group level. Some of these groups have high overlap and were merged through a multi-phased syncytial algorithm motivated from Almodóvar-Rivera & Maitra (2020, JMLR, 21, 1). Five groups were merged in the first phase, resulting in three complex-structured groups. Our algorithm determined further complex structure and permitted another merging phase, revealing two complex-structured groups at the highest level. A nonparametric bootstrap procedure was also used to estimate the confidence of each of our group assignments. These assignments generally had high confidence in classification, indicating great degree of certainty of the HSS assignments into our complex-structured groups. The physical and kinematic properties of the two groups were assessed in terms of

$M_s$

,

$R_e$

, surface density and

$M_s/L_\nu$

. The first group consisted of older, smaller and less bright HSS while the second group consisted of brighter and younger HSS. Our analysis provides novel insight into the physical and evolutionary properties of HSS and also helps understand physical and evolutionary properties of candidate globular clusters. Further, the candidate globular clusters (GCs) are seen to have very high chance of really being GCs rather than dwarfs or dwarf ellipticals that are also indicated to be quite distinct from each other.
Stacking the synchrotron cosmic web with FIGARO
Authors: Hodgson Torrance , Vazza Franco , Johnston-Hollitt Melanie , McKinley Benjamin 
Published: August 2022

AbstractRecently Vernstrom et al. (2021, MNRAS) claimed the first definitive detection of the synchrotron cosmic web, obtained by ‘stacking’ hundreds of thousands of pairs of close-proximity clusters in low-frequency radio observations and looking for a residual excess signal spanning the intracluster bridge. A reproduction study by Hodgson et al. (2022, PASA, 39, e013), using both the original radio data as well as new observations with the Murchison Widefield Array, failed to confirm these findings. Whilst the detection remains unsure, we here turn to stacking asimulatedradio sky to understand what kind of excess radio signal is predicted by our current best cosmological models of the synchrotron cosmic web. We use the FIlaments & GAlactic RadiO (FIGARO; Hodgson et al. 2021a, PASA, 38, e047) simulation, which models both the synchrotron cosmic web as well as various subtypes of active galactic nucleii and star-forming galaxies. Being a simulation, we have perfect knowledge of the location of clusters and galaxy groups which we use in our own stacking experiment. Whilst we do find an excess radio signature in our stacks that is attributable to the synchrotron cosmic web, its distribution is very different to that found by Vernstrom et al. (2021, MNRAS). Instead, we observe the appearance of excess emission on the immediate interiors of cluster pairs as a result of asymmetric, ‘radio relic’-like shocks surrounding cluster cores, whilst the excess emission spanning the intracluster region—attributable to filaments proper—is two orders of magnitude lower and undetectable in our experiment even under ideal conditions.
Design of a high-resolution antenna array solar observing system for radio frequencies of 25–110 MHz
Authors: Wang Yuxi , Dong Zhen , Lu Guang , Wu Zhao , Su Yanrui , Chen Yao , Yan Fabao 
Published: August 2022

AbstractSpectral observations with high temporal and frequency resolution are of great significance for studying the fine structures of solar radio bursts. In addition, it is helpful to understand the physical processes of solar eruptions. In this paper, we present the design of a system to observe solar radio bursts with high temporal and frequency resolutions at frequencies of 25–110 MHz. To reduce the impact of analog devices and improve the system flexibility, we employ various digital signal processing methods to achieve the function of analog devices, such as polarisation synthesis and beamforming. The resourceful field programmable gate array is used to process radio signals. The system has a frequency resolution of$\sim$30 kHz and a temporal resolution of up to 0.2 ms. The left/right circular polarisation signals can be simultaneously observed. At present, the system has been installed at Chashan Solar Observatory operated by the Institute of Space Science, Shandong University. The system is running well, multiple bursts have been observed, and relevant data have been obtained.
Exploratory Concept Formation and Tool Development in Neuroscience
Authors: Haueis Philipp 
Published: August 2022

AbstractDeveloping tools is a crucial aspect of experimental practice, yet most discussions of scientific change traditionally emphasize theoretical over technological change. To elaborate on the role of tools in scientific change, I offer an account that shows how scientists use tools in exploratory experiments to form novel concepts. I apply this account to two cases in neuroscience and show how tool development and concept formation are often intertwined in episodes of tool-driven change. I support this view by proposing common normative principles that specify when exploratory concept formation and tool development succeed (rather than fail) to initiate scientific change.
MERIP's Impact on Middle East Studies: Showcasing a MESA Roundtable
Authors: Hazbun Waleed 
Published: August 2022

AbstractIn anticipation of the fiftieth anniversary of its founding, past and present members of the Middle East Research and Information Project (MERIP) organized a roundtable for the annual meeting of the Middle East Studies Association (MESA) entitled “MERIP's Impact on Middle East Studies.” Due to the COVID-19 pandemic, on October 14, 2020, the roundtable was conducted as a virtual webinar. The participants included Joe Stork, Judith Tucker, Zachary Lockman, Ted Swedenburg, Norma Claire Moruzzi, Jacob Mundy, and Stacey Philbrick Yadav. The roundtable was moderated by Waleed Hazbun and offered reflections about MERIP's original mission, explained how its model for “research and information” evolved, and explored how over fifty years MERIP's contributions have helped transform Middle East Studies scholarship. The following is a transcript that has been edited for clarity and length.
The Cultural Politics and Political Culture of MERIP and Beyond
Authors: Silverstein Paul A. , Swedenburg Ted 
Published: August 2022

AbstractIn this essay, we examine how MERIP has navigated the frictions between the political economic critique of extraction and domination in the region, and more semiotic models which center “culture,” variously understood, in their analyses of power and inequality. Broadly speaking, MERIP authors have addressed four dimensions of culture writ large: aesthetic expressions and artistic performances; everyday practices and ordinary life in their various multisensorial, affective experiences; identity performance along intersectional terrains of gender, sexuality, ethnicity, and race; and discursive formations in which the very categories of the “political” and the “economic” are produced and reproduced within shifting fields of power. In all its dimensions, culture is embedded and entangled in material conflicts over production, distribution, and consumption, and thus necessarily political, but not merely so. How to approach cultural politics and political culture without reducing them to a play of hegemony and resistance has been a persistent challenge in cultural analysis. By exploring how MERIP authors have negotiated this fraught terrain—by outlining MERIP's effective culture concept with a focus on its aesthetic dimensions—we offer a window into a central tension within the broader field of Middle East studies.
How a Middle Eastern Experience Helped Lead to the Formation of MERIP
Authors: Fischbach Michael R. 
Published: August 2022

AbstractDuring the late 1960s, left-wing American activists faced challenges when trying to find out about what was happening in the Middle East and what their government was doing there. Yet overall, some activists still felt that by 1970 the American Left suffered from an overall dearth of solid information and regular, independent, critical analysis of the Middle East. As a result, the Middle East Research and Information Project (MERIP) and its publication, MERIP Reports, were established in 1971 to fill that void. However, in many ways a major impetus for MERIP's formation was not just its founders’ hunger for better analysis of the region, but also the deep impressions made on them by a dramatic and influential trip several of them took to Lebanon, Syria, and Jordan in August and early September 1970. Thus, while it is true that, since its inception, MERIP has shaped the study of the Middle East, it is also true that it was the Middle East that first shaped those who formed MERIP.
MERIP's 50 Years of Women and Gender
Authors: Tucker Judith E. 
Published: August 2022

AbstractDrawing on a reading of MERIP's articles related to women's and gender studies over the course of its 50-year history, this piece reflects on how MERIP's forays into this field formed part of its overarching aspiration to place scholarship in the service of progressive political projects. I explore how intellectual trends and political commitments worked together to shape the topics and approaches related to gender that appeared in MERIP's pages. The political purposes of knowledge production were omnipresent in the minds of authors and editors, and we see evidence of a conscious program of critique of past scholarship on women and gender in the region, as well as sustained attention to research and writing that could connect, or perhaps even be useful, to struggles in the Middle East region and the amelioration of U.S. policy. The framing of issues varied over time, from a focus on political economy to political action to broader cultural questions, in rhythm with shifts in scholarly paradigms and events on the ground.
Conceptual or Pragmatic? Differentiating Floating Charges from Unitary Security Interests under Nigerian Law
Authors: Esangbedo Gregory 
Published: August 2022

AbstractA key novelty of the unitary system of personal property security law is the concept of security interests or rights developed to address the rather complex categorizations of security rights under the common law. With respect to the limitations of floating charges as security devices for loans under the common law, there were expectations that the unitary security interest could provide an alternative security device capable of addressing the problems faced by hitherto inhibited business borrowers. This article compares the floating charge device to the unitary security interest in some critical areas to ascertain whether the latter ameliorates the difficulties associated with floating charges or whether it merely creates an added conceptual burden within the framework of an already convoluted secured transactions system.
Vulnerable, recalcitrant and resilient: a Foucauldian discourse analysis of risk and older people within the context of COVID-19 news media
Authors: Skoss Marjorie , Batten Rachel , Cain Patricia , Stanley Mandy 
Published: August 2022

Abstract
Risk is an innate and integral part of everyday life and is present in simple, everyday occupations and complex actions. Age-related stereotypes can mean older people have little opportunity to engage in activities that present some degree of risk. The present study explores the discourse around risk and older people in the context of the COVID-19 pandemic. We investigated news media as a reflection of the dominant public discourse around older people's behaviour to identify how risk is represented in relation to occupational engagement. Texts relating to older people and COVID-19 were sourced from the West Australian newspaper for a period of two months. Seventy texts were subject to Foucauldian discourse analysis to identify subject positions, location of risk and discursive features. Findings indicate that older people were segregated from the rest of society, with their behaviours framed in mostly negative ways. We identified three areas of discourse: vulnerable, and in need of protection; recalcitrant, and in need of management; and resilient, deserving of respect. While we recognise competing representations, implicit within the dominant discourse was the premise that older people were not capable of mediating risks and required ‘management’. These findings highlight the role of surveillance in restricting occupational engagement for older people and carry implications for older people, the public and therapists.
Subsegmental representation in child speech production: structured variability of stop consonant voice onset time in American English and Cantonese
Authors: CHODROFF Eleanor , BRADSHAW Leah , LIVESAY Vivian 
Published: August 2022

AbstractVoice onset time (VOT) of aspirated stop consonants is marked by variability and systematicity in adult speech production. The present study investigated variability and systematicity of voiceless aspirated stop VOT from 161 two- to five-year-old talkers of American English and Cantonese. Overall, many aspects of child VOT productions parallel adult patterns, the analysis of which can help inform our understanding of early speech production. For instance, VOT means were comparable between children and adults, despite greater variability. Further, across children in both languages, talker-specific VOT means were strongly correlated between [th] and [kh]. This correlation may reflect a constraint of “target uniformity” that minimizes variation in the phonetic realization of a shared distinctive feature. Therefore findings suggest that target uniformity is not merely a product of a mature grammar, but may instead shape speech production representations in children as young as two years of age.
Assessment of the effect of landowner type on deforestation in the Brazilian Legal Amazon using remote sensing data
Authors: Cabral Ana IR , Laques Anne Elisabeth , Saito Carlos Hiroo 
Published: August 2022

SummaryThe Brazilian Legal Amazon contains important reservoirs of forest that are threatened by stakeholders’ behaviour. The Cadastro Ambiental Rural (CAR; Rural Environmental Registry) database was used to define the limits and classes of landowner according to private property size. For each class, we identified the annual forest-cover/cover-loss profile at 2-year intervals from 2000 to 2020 based on Brazilian Annual Land Use and Land Cover Mapping Project (MapBiomas) and Program for Deforestation Monitoring (PRODES) data. The analysis revealed that very large landowners dominate the CAR-registered area and that deforestation is influenced by landowner type. The cumulative contributions to deforestation were 2 916 245.96, 1 234 216.79, 2 871 400.36, 2 805 058.62 and 2 637 485.60 ha for very large landowners, large landowners, medium landowners, small landowners and very small landowners, respectively. Very large landowners (1.7% of the total number of properties) had more forest on their properties but caused the greatest amount of deforestation in total, often associated with agribusiness. Small and very small landowners were more numerous (21.0% and 68.3% of the total number of properties, respectively), but they owned a small total area and contributed less to total deforestation. Property size and landownership asymmetry should be considered in deforestation control policies and commitments to the Sustainable Development Goals agenda.
Vitamin E deficiency in childhood: a narrative review
Authors: Lobo Lina Monteiro de Castro , Hadler Maria Claret Costa Monteiro 
Published: August 2022

AbstractVitamin E is an important nutrient from the earliest stages of life. It plays key roles as an antioxidant and in the maintenance of the immune system, among others. Vitamin E deficiency (VED), which occurs more frequently in children, is rarely addressed in the literature. This narrative review aims to summarise the chemistry, biology, serum indicators and clinical trials that have evaluated the impact of fortification and other relevant aspects of vitamin E, in addition to the prevalence of its deficiency, in children worldwide. Vitamin E intake in recommended amounts is essential for this nutrient to perform its functions in the body. Serum α-tocopherol is the most widely used biochemical indicator to assess the prevalence of VED. VED has been associated with symptoms secondary to fat malabsorption and may lead to peripheral neuropathy and increased erythrocyte haemolysis. Reduced concentrations of α-tocopherol may be caused by the combination of diets with low amounts of vitamin E and inadequate consumption of fats, proteins and calories. The lowest prevalence of VED was found in Asia and the highest in North America and Brazil. High proportions of VED provide evidence that this nutritional deficiency is a public health problem in children and still little addressed in the international scientific literature. The planning, evaluation and implementation of health policies aimed at combatting VED in the paediatric population are extremely important.
From germination to seedling development: the effects of smoke on a native and an invasive grass species of the Cerrado
Authors: Sanchez Luís G.F. , Dantas-Junior Ademar B. , Porto Ana Clara C.Q. , Musso Carolina , Sato Margarete N. , Miranda Heloisa S. 
Published: August 2022

AbstractThe Brazilian Cerrado, a Neotropical savanna, is a fire-prone ecosystem where the ground layer biomass consists mainly of graminoids. However, as for other savannas, the effects of fire cues (such as smoke) on Cerrado grasses do not present a clear pattern, either for germination or seedling development. Smoke can stimulate different stages of the plant life cycle, which can alter the community and invasion processes. So far, most research on the subject focuses on germination, not addressing post-germinative phases, a sensitive stage of plant development. Here, we investigated the effect of smoke on a native (Echinolaena inflexa) and an invasive (Urochloa decumbens) grass species common in the Cerrado. We analysed germinative parameters and seedling mass and length after exposing the seeds to dry smoke for 5, 10, 15 or 20 min. Seedling development was assessed by measuring shoot and root systems after cultivating germinated seeds for 3, 7 or 15 d. Smoke did not affect germination percentages. However, fumigation reduced the mean germination time of both species and the germination onset of E. inflexa. U. decumbens had higher length values in all periods of cultivation, whereas mass values only surpassed that of E. inflexa at 15 d. Smoke exposure reduced the aboveground length of 7-d seedlings of U. decumbens, and mass of 15-d plants of both species. Also, smoke enhanced the root investment of the native and invasive species in different cultivation periods. Therefore, studying post-germinative parameters on seedling development may bring further insights into the smoke effects.
Just a question of time? Explaining non-take-up of a public health insurance program designed for undocumented immigrants living in France
Authors: Dourgnon P. , Jusot F. , Marsaudon A. , Sarhiri J. , Wittwer J. 
Published: August 2022

AbstractState Medical Aid is a public health insurance program that allows undocumented immigrants with low financial resources to access health care services for free. However, the low take-up rate of this program might threaten its efficiency. The purpose of this study is therefore to provide the determinants of such a low take-up rate. To this end, we rely on the Premier Pas survey. This is an original representative sample of undocumented immigrants attending places of assistance to vulnerable populations in France. Determinants of State Medical Aid take-up are analyzed through probit and Cox modeling. The results show that only 51% of those who are eligible for the State Medical Aid program are actually covered, and this proportion is higher among women than among men. The length of stay in France is the most important determinant of take-up. It is worth noting that State Medical Aid take-up is not associated with chronic diseases or functional limitations and is negatively associated with poor mental health. There is, therefore, mixed evidence of health selection into the program. Informational barriers and vulnerabilities experienced by undocumented immigrants are likely to explain this low take-up.