bluuebunny/crossref_metadata_2025_split huggingface dataset:
Wellbore instability management using geomechanical modeling and wellbore stability analysis for Zubair shale formation in Southern Iraq
Authors: Allawi Raed H. , Al-Jawad Mohammed S. 
Published: September 2021

AbstractWellbore instability problems cause nonproductive time, especially during drilling operations in the shale formations. These problems include stuck pipe, caving, lost circulation, and the tight hole, requiring more time to treat and therefore additional costs. The extensive hole collapse problem is considered one of the main challenges experienced when drilling in the Zubair shale formation. In turn, it is caused by nonproductive time and increasing well drilling expenditure. In this study, geomechanical modeling was used to determine a suitable mud weight window to overpass these problems and improve drilling performance for well development. Three failure criteria, including Mohr–Coulomb, modified Lade, and Mogi–Coulomb, were used to predict a safe mud weight window. The geomechanical model was constructed using offset well log data, including formation micro-imager (FMI) logs, acoustic compressional wave, shear wave, gamma ray, bulk density, sonic porosity, and drilling events. The model was calibrated using image data interpretation, modular formation dynamics tester (MDT), leak-off test (LOT), and formation integrity test (FIT). Furthermore, a comparison between the predicted wellbore instability and the actual wellbore failure was performed to examine the model's accuracy. The results showed that the Mogi–Coulomb failure and modified Lade criterion were the most suitable for the Zubair formation. These criteria were given a good match with field observations. In contrast, the Mohr–Coulomb criterion was improper because it does not match shear failure from the caliper log. In addition, the obtained results showed that the inappropriate mud weight (10.6 ppg) was the main cause behind wellbore instability problems in this formation. The optimum mud weight window should apply in Zubair shale formation ranges from 11.5 to 14 ppg. Moreover, the inclination angle should be less than 25 degrees, and azimuth ranges from 115 to 120 degrees northwest-southeast (NE–SW) can be presented a less risk. The well azimuth of NE–SW direction, parallel to minimum horizontal stress (Shmin), will provide the best stability for drilling the Zubair shale formation. This study's findings can help understand the root causes of wellbore instability in the Zubair shale formation. Thus, the results of this research can be applied as expenditure effectiveness tools when designing for future neighboring directional wells to get high drilling performance by reducing the nonproductive time and well expenses.
Neutron applications developing at compact accelerator-driven neutron sources
Authors: Kiyanagi Yoshiaki 
Published: September 2021

AbstractNeutrons have been used in a wide field of applications by using various neutron sources. Material science is one of the widest research fields. The activity is supported by nuclear research reactors and high-intensity spallation neutron sources based on a high-intensity proton accelerator. However, it is desired to perform a measurement when researchers want to do and to perform adventuresome experiments that have not yet confirmed its importance. Furthermore, trial and error measurements are necessary to improve a measurement method. Compact accelerator-driven neutron sources are suitable for such usage and in some cases can complement the measurement at a large facility. The use of the compact neutron source has sometimes led to new methods. Other than material science, a new application of soft error acceleration test has been performed at the compact accelerator-driven neutron sources. Another neutron application is radiation therapy called as boron neutron capture therapy. In this field, nuclear reactor neutron sources have been used but many of them shut down. It was desired to construct the BNCT facility near a hospital. Therefore, BNCT facilities based on the compact accelerator have been constructed in the world. Here, the neutron sources and new methods and applications developing at compact accelerator-driven neutron sources are introduced.
Coherence as Competence
Authors: Lasonen-Aarnio Maria 
Published: September 2021

AbstractBeingincoherentis often viewed as a paradigm kind of irrationality. Numerous authors attempt to explain the distinct-seeming failure of incoherence by positing a set of requirements of structural rationality. I argue that the notion of coherence that structural requirements are meant to capture is very slippery, and that intuitive judgments – in particular, a charge of a distinct, blatant kind of irrationality – are very imperfectly correlated with respecting the canon of structural requirements. I outline an alternative strategy for explaining our patterns of normative disapproval, one appealing to feasible dispositions to conform to substantive, non-structural norms. A wide range of paradigmatic cases of incoherence, I will argue, involve manifesting problematic dispositions, dispositions that manifest across a range of cases as blatant-seeming normative failures.
The Interested Expert Problem and the Epistemology of Juries
Authors: Guerrero Alexander 
Published: September 2021

AbstractThe existence of experts raises a host of interesting questions in social, legal, and political epistemology. This article introduces and discusses interested experts – people who are experts on some topic, but who also have a distinct set of values and preferences regarding that topic, so that they are not well-described as “disinterested” parties. Interested experts raise several distinct problems in social, legal, and political epistemology. Some general questions arise: can we rationally or justifiably form beliefs relying on interested expert testimony? Do they constitute knowledge? Under what circumstances? This article focuses on a specific question in legal epistemology: should interested experts be allowed to serve on juries and, if so, should it be permissible for lawyers to strike them from the pool of potential jurors? My hope is that concentrating on this question will provide insight into the more general questions concerning the epistemology of testimony with respect to interested experts, while also providing concrete recommendations for jury reform to improve the epistemic performance of juries.
A broadband radio view of transient jet ejecta in the black hole candidate X-ray binary MAXI J1535–571
Authors: Chauhan Jaiverdhan , Miller-Jones J. C. A. , Anderson G. E. , Paduano A. , Sokolowski M. , Flynn C. , Hancock P. J. , Hurley-Walker N. , Kaplan D. L. , Russell T. D. , Bahramian A. , Duchesne S. W. , Altamirano D. , Croft S. , Krimm H. A. , Sivakoff G. R. , Soria R. , Trott C. M. , Wayth R. B. , Gupta V. , Johnston-Hollitt M. , Tingay S. J. 
Published: September 2021

AbstractWe present a broadband radio study of the transient jets ejected from the black hole candidate X-ray binary MAXI J1535–571, which underwent a prolonged outburst beginning on 2017 September 2. We monitored MAXI J1535–571 with the Murchison Widefield Array (MWA) at frequencies from 119 to 186 MHz over six epochs from 2017 September 20 to 2017 October 14. The source was quasi-simultaneously observed over the frequency range 0.84–19 GHz by UTMOST (the Upgraded Molonglo Observatory Synthesis Telescope) the Australian Square Kilometre Array Pathfinder (ASKAP), the Australia Telescope Compact Array (ATCA), and the Australian Long Baseline Array (LBA). Using the LBA observations from 2017 September 23, we measured the source size to be$34\pm1$mas. During the brightest radio flare on 2017 September 21, the source was detected down to 119 MHz by the MWA, and the radio spectrum indicates a turnover between 250 and 500 MHz, which is most likely due to synchrotron self-absorption (SSA). By fitting the radio spectrum with a SSA model and using the LBA size measurement, we determined various physical parameters of the jet knot (identified in ATCA data), including the jet opening angle ($\phi_{\rm op} = 4.5\pm1.2^{\circ}$) and the magnetic field strength ($B_{\rm s} = 104^{+80}_{-78}$mG). Our fitted magnetic field strength agrees reasonably well with that inferred from the standard equipartition approach, suggesting the jet knot to be close to equipartition. Our study highlights the capabilities of the Australian suite of radio telescopes to jointly probe radio jets in black hole X-ray binaries via simultaneous observations over a broad frequency range, and with differing angular resolutions. This suite allows us to determine the physical properties of X-ray binary jets. Finally, our study emphasises the potential contributions that can be made by the low-frequency part of the Square Kilometre Array (SKA-Low) in the study of black hole X-ray binaries.
Cascading effects of caffeine intake by primary consumers to the upper trophic level
Authors: Tougeron Kévin , Hance Thierry 
Published: September 2021

AbstractSecondary metabolites are central to understanding the evolution of plant–animal interactions. Direct effects on phytophagous animals are well-known, but how secondary consumers adjust their behavioural and physiological responses to the herbivore's diet remains more scarcely explored for some metabolites. Caffeine is a neuroactive compound that affects both the behaviour and physiology of several animal species, from humans to insects. It is an alkaloid present in nectar, leaves and even sap of numerous species of plants where it plays a role in chemical defences against herbivores and pathogens. Caffeine effects have been overlooked in generalist herbivores that are not specialized in coffee or tea plants. Using a host–parasitoid system, we show that caffeine intake at a relatively low dose affects longevity and fecundity of the primary consumer, but also indirectly of the secondary one, suggesting that this alkaloid and/or its effects can be transmitted through trophic levels and persist in the food chain. Parasitism success was lowered by ≈16% on hosts fed with caffeine, and parasitoids of the next generation that have developed in hosts fed on caffeine showed a reduced longevity, but no differences in mass and size were found. This study helps at better understanding how plant secondary metabolites, such as caffeine involved in plant–animal interactions, could affect primary consumers, could have knock-on effects on upper trophic levels over generations, and could modify interspecific interactions in multitrophic systems.
The Puzzle of Frequent and Large Issues of Debt and Equity
Authors: Huang Rongbing , Ritter Jay R. 
Published: September 2021

AbstractMore frequent, larger, and more recent debt and equity issues in the prior 3 fiscal years are followed by lower stock returns in the subsequent year. The intercept of a q-factor calendar-time regression for the value-weighted (VW) portfolio of firms with at least 3 large issues is −0.63% per month (t-stat. = −4.31). Purging the factor returns of recent issuers increases the magnitude of the estimated underperformance following frequent equity issues. A VW Fama–MacBeth regression shows that firms with 3 equity issues underperform nonissuers by 0.65% per month (t-stat. = −2.65). Earnings announcement returns are low following frequent issues, especially equity issues.
Performance evaluation of GNSS receiver clock modelling in urban navigation using geodetic and high-sensitivity receivers
Authors: Jain Ankit , Schön Steffen 
Published: September 2021

AbstractIn urban areas, the Global Navigation Satellite System (GNSS) can lead to position errors of tens of meters due to signal obstruction and severe multipath effects. In cases of 3D-positioning, the vertical coordinate is estimated less accurately than are the horizontal coordinates. Multisensor systems can enhance navigation performance in terms of accuracy, availability, continuity and integrity. However, the addition of multiple sensors increases the system cost, and thereby the applicability to low-cost applications is limited. By using the concept of receiver clock modelling (RCM), the position estimation can be made more robust; the use of high-sensitivity (HS) GNSS receivers can improve the system availability and continuity. This paper investigates the integration of a low-cost HS GNSS receiver with an external clock in urban conditions; subsequently, the gain in the navigation performance is evaluated. GNSS kinematic data is recorded in an urban environment with multiple geodetic-grade and HS receivers. The external clock stability information is incorporated through the process noise matrix in a Kalman filter when estimating the position, velocity and time states. Results shows that the improvement in the precision of the height component and vertical velocity with both receivers is about 70% with RCM compared with the estimates obtained without applying RCM. Pertaining accuracy, the improvement in height with RCM is found to be about 70% and 50% with geodetic and HS receivers, respectively. In terms of availability, the HS receiver delivers an 100% output compared with a geodetic receiver, which provides an output 99⋅4% of the total experiment duration.
Expressing prospective location in French: rethinking Vandeloise’s ‘principle of anticipation’
Authors: Tutton Mark 
Published: September 2021

AbstractVandeloise’s (1987, 2017) principle of anticipation proposes that French verbs of motion can enable prospective readings of static locative prepositions. However, it has little to say about verbs of motion that do not have a prospective verbal reference place (VRP): that is, to what extent are verbs of initial polarity like partir and s’enfuir able to trigger prospective readings of prepositions? This article argues that each verb must be analysed individually and that prospective readings of prepositions depend on the interaction of verbal and prepositional semantics: for example, the movement away from a viewer expressed by partir favours a prospective reading of derrière but not of devant: this is due to differences regarding access to perception. The animacy of the Ground and its status as a material or spatial entity (Vandeloise, 2017) is also a key factor (e.g. partir près de + spatial entity). This suggests that verbs of initial polarity participate in synergistic verb/preposition/Ground interpretations that help to overcome their lack of a VRP. The prospective reading of the preposition depends on the choice of verb and Ground, thus supporting a distributed view of spatial semantics (Sinha and Kuteva, 1995; Zlatev, 1997, 2003, 2007; Evans and Tyler, 2004).
Reduced Error Recognition Explains Post-Error Slowing Differences among Children with Attention Deficit Hyperactivity Disorder
Authors: Arnett Anne B. , Rhoads Candace , Rutter Tara M. 
Published: September 2021

AbstractObjective:Youth with attention deficit hyperactivity disorder (ADHD) often show reduced post-error slowing (PES) compared to typically developing controls. This finding has been interpreted as evidence that children with ADHD have error recognition and adaptive control impairments. However, several studies report mixed results regarding PES differences in ADHD, and among healthy controls, there is considerable debate about the cognitive-behavioral origin of PES.Methods:We tested competing hypotheses aimed at clarifying whether reduced PES in children with ADHD is due to impaired error detection, deficits in adaptive control, and/or attention orienting to novelty. Children aged 7–11 years with a diagnosis of ADHD (n = 74) and controls (n = 30) completed four laboratory-based computer tasks with variable cognitive loads and error types.Results:ADHD diagnosis was associated with shorter PES only on a task with high cognitive load and low error-cuing, consistent with impaired error recognition. In contrast, there was no evidence of impaired adaptive control or heightened novelty orienting among children with ADHD.Conclusions:The cognitive-behavioral origin of PES is multifactorial, but reduced PES among children with an ADHD diagnosis is due to impaired error recognition during cognitively demanding tasks. Behavioral interventions that scaffold error recognition may facilitate improved performance among children with ADHD.
Trading Away Tariffs: The Operations of the GATT System
Authors: Goldstein Judith , Gulotty Robert 
Published: September 2021

AbstractSince its formation, the GATT/WTO system has facilitated a worldwide reduction of trade barriers. We return to a founding moment of the regime, the GATT 1947 (GATT47), and look closely at the liberalization process, analyzing exactly what concessions were granted to whom and in return for what. With these data, we evaluate three prominent explanations for the operation of the early GATT. First, we ask whether or not US negotiators granted asymmetric access to the US market to spur post-war recovery. Second, we look at how the rules adopted in GATT47 balanced the interests of import sensitive producers with those of the more nascent exporter interests. Third, we examine specific US concessions and ask whether or not the US used the domestic market to either increase the productive capacity of nations damaged during the war and/or to bolster unstable regimes. Our most general finding is that the US, at least in this first Round of the trade regime, was less a liberal warrior and more a seeker of stability, and that tariff setting was significantly constrained by the institutions governing global tariff negotiations.
Stripping foreign fighters of their citizenship: International human rights and humanitarian law considerations
Authors: Paulussen Christophe 
Published: September 2021

AbstractThis article will briefly present a number of international human rights law considerations related to the topic of citizenship stripping of foreign fighters, that is: “individuals, driven mainly by ideology, religion and/or kinship, who leave their country of origin or their country of habitual residence to join a party engaged in an armed conflict”, most notably the conflict in Syria and Iraq. After that, the article will focus on considerations in the context of international humanitarian law, which have been less frequently the subject of academic debate. This contribution concludes that citizenship stripping is not only highly problematic under international human rights law, but also from the perspective of international humanitarian law. The measure – which is likely to constitute cruel, inhuman or degrading treatment or punishment – violates Article 3 Common to the four Geneva Conventions, but it also undermines accountability for international humanitarian law violations already committed and can engender new violations through the non-removal of the suspect from the conflict zone. One of the few positive sides of the connection between the measure and international humanitarian law is that even if nationality is deprived, this will not have an effect on the international humanitarian law obligation to treat that deprived person humanely. In that sense, international humanitarian law provides a welcome – albeit temporary – safety net of decent treatment for people who have become victims of countries’ refusal to take responsibility for their own citizens.
Uncertainties, Limits, and Benefits of Climate Change Mitigation for Soil Moisture Drought in Southwestern North America
Authors: Cook B. I. , Mankin J. S. , Williams A. P. , Marvel K. D. , Smerdon J. E. , Liu H. 
Published: September 2021

AbstractOver the last two decades, southwestern North America (SWNA) has been in the grip of one of the most severe droughts of the last 1,200 years, with one third to nearly one half of its severity attributable to climate change. We analyze how the risk of extreme soil moisture droughts in SWNA, analogous to the most severe 21‐year (≥ in magnitude to 2000–2020) and single‐year (≥ in magnitude to 2002) events of the last several decades, changes in projections from Phase 6 of the Coupled Model Intercomparison Project. By the end of the 21stcentury, SWNA experiences robust (R ≥ 0.80) soil moisture drying and substantial increases in extreme single‐year drought risk that scale strongly with warming, spanning an 8%–26% probability of occurrence across +2–4 K. Notably, our results show that 21‐year droughts analogous to 2000–2020 are up to 5 times more likely than extreme single‐year droughts under all levels of warming (≈50%). These high levels of 21‐year drought risk are largely invariant across scenarios because of large spring precipitation declines in half the models, shifting SWNA into a drier mean state. Despite projections of this sweeping and ostensibly inevitable increase in 21‐year drought risk, climate mitigation reduces their severity by reducing the magnitude of extreme single‐year droughts during these events. Our results emphasize both the importance of preparing SWNA for imminent increases in persistent drought events and constraining projected precipitation uncertainty to better resolve future long‐term drought risk.
Organic Matter Chemistry Drives Carbon Dioxide Production of Peatlands
Authors: Normand A. E. , Turner B. L. , Lamit L. J. , Smith A. N. , Baiser B. , Clark M. W. , Hazlett C. , Kane E. S. , Lilleskov E. , Long J. R. , Grover S. P. , Reddy K. R. 
Published: September 2021

AbstractPeatlands play a critical role in the global carbon (C) cycle, encompassing ∼30% of the 1,500 Pg of C stored in soils worldwide. However, this C is vulnerable to climate and land‐use change. Ecosystem models predict the impact of perturbation on C fluxes based on soil C pools, yet responses could vary markedly depending on soil organic matter (SOM) chemistry. Here, we show that one SOM functional group responds strongly to environmental factors and predicts the risk of carbon dioxide (CO2) release from peatlands. The molecular composition of SOM in 125 peatlands differed markedly at the global scale due to variation in temperature, land‐use, vegetation, and nutrient status. Despite this variation, incubation of peat from a subset of 11 sites revealed thatO‐alkyl C (i.e., carbohydrates) was the strongest predictor of aerobic CO2production. This explicit link provides a simple parameter that can improve models of peatland CO2fluxes.
Tropical Western Pacific Hydrology During the Last 6,000 Years Based on Wildfire Charcoal Records From Borneo
Authors: Yamamoto Masanobu , Kikuchi Takafumi , Sakurai Hiromichi , Hayashi Ryoma , Seki Osamu , Omori Takayuki , Sulaiman Abdullah , Shaari Hasrizal , Abdullah Mohd Zulhilmy , Melling Lulie 
Published: September 2021

AbstractThe forcing of multicentennial climate variability in the Western Pacific Warm Pool (WPWP) region is not fully understood. Here, we generated 6‐kyr‐long continuous charcoal records from five peatlands in Borneo. Every several hundred years, peaks of charcoal influx were identified in the composite record, indicating that the peatlands repeatedly experienced dry conditions and wildfires. Major fire events were identified at ∼5.4, 4.7, 4.4, 3.7, 3.2, 2.7, 2.4, 2.2, 1.7, 1.1, 0.6, and 0.3 ka. Most of these coincided with the maxima of Borneo speleothem δ18O and occurred in the high solar activity periods following the solar minima. This suggests that the higher solar activity decreased rainfall, increasing dryness and wildfire frequency. This result challenges the hypothesis that high solar activity intensifies atmospheric convection in the WPWP area.