bluuebunny/crossref_metadata_2025 huggingface dataset:
The wrapped XLindley distribution
Authors: Zinhom E. , Nassar M. M. , Radwan S. S. , Elmasry A.
Published: October 2023

In the study of many environmental phenomena, circular statistical analysis and applications to directional data are crucial. In this paper, we introduce the wrapped XLindley distribution, a novel circular distribution with a single parameter. We derive expressions for the distribution’s characteristic function, trigonometric moments, and other associated descriptive measures. The unknown distributional parameter is estimated using the maximum likelihood, least squares, and weighted least squares approach, and the accuracy of these estimates is tested using a simulation study. Finally, to clarify the suggested distribution’s modeling potential, we fit the proposed model to two circular real-world data sets and evaluate the goodness of fit of this distribution in comparison to the wrapped Lindley, wrapped modified Lindley, Von Mises, Jones–Pewsey, and Kato–Jones distributions.
Automatic weighing system vs. manual weighing precision comparison in PM-loaded filter measurements under different humidity conditions
Authors: Chyzhykov Dmytro , Widziewicz-Rzońca Kamila , Błaszczak Monika , Rogula-Kopiec Patrycja , Słaby Krzysztof
Published: October 2023

Currently, there is a lack of research directly comparing the precision of automatic weighing systems and manual weighing in the context of particulate matter (PM) filter equilibration and measurements under different humidity conditions. During experimental measurements, three different types of PM-loaded filters were weighed using manual and automatic balances. During manual weighing, every filter was weighed twice in three different relative humidity conditions. The same procedure was done using an automated weighing system. In most cases, it was found that under relative humidities in the range of 30–55% RH, the manual and automated methods can be treated as referential. Regarding device stability, very slight but overall better precision was found for 30% RH, suggesting that 40 CFR Part 50, Appendix L requirements regarding conditioning humidity (30–40% RH) seem more suitable than those presented in the PN-EN 12341:2014 standard (45–50% RH). Understanding the effects of the influence of the RH% on PM mass measurements is a matter of great importance, because water vapor condensed on a filter can affect the particulate matter concentrations. This is especially important in areas where regulatory limits are exceeded. Calculation of uncertainty in the PM mass measurements is therefore crucial for determining the actual sample mass and improving air monitoring practices. In a nutshell, the experimental results obtained clearly describe how changing RH% conditions affect the PM weighing precision during manual and automated measurements.
Causality in extremes of time series
Authors: Bodik Juraj , Paluš Milan , Pawlas Zbyněk
Published: October 2023

Consider two stationary time series with heavy-tailed marginal distributions. We aim to detect whether they have a causal relation, that is, if a change in one causes a change in the other. Usual methods for causal discovery are not well suited if the causal mechanisms only appear during extreme events. We propose a framework to detect a causal structure from the extremes of time series, providing a new tool to extract causal information from extreme events. We introduce the causal tail coefficient for time series, which can identify asymmetrical causal relations between extreme events under certain assumptions. This method can handle nonlinear relations and latent variables. Moreover, we mention how our method can help estimate a typical time difference between extreme events. Our methodology is especially well suited for large sample sizes, and we show the performance on the simulations. Finally, we apply our method to real-world space-weather and hydro-meteorological datasets.
Quality of life among people living with mental illness and predictors in Africa: a systematic review and meta-analysis
Authors: Alemu Wondale Getinet , Due Clemence , Muir-Cochrane Eimear , Mwanri Lillian , Azale Telake , Ziersch Anna
Published: October 2023

Introduction

Quality of life (QoL) of patients with mental illness has been examined internationally but to a lesser extent in developing countries, including countries in Africa. Improving QoL is vital to reducing disability among people with mental illness. Therefore, this systematic review and meta-analysis aimed to assess the prevalence of QoL and associated factors among people living with mental illness in Africa.

Methods

Using the PICOT approach, Scopus, MEDLINE, PsycINFO, CINAHL, Embase, the Web of Science, and Google Scholar were searched. A structured search was undertaken, comprising terms associated with mental health, mental illness, QoL, and a list of all African countries. The Joanna Briggs Institute Quality Appraisal Checklist is used to evaluate research quality. Subgroup analysis with Country, domains of QoL, and diagnosis was tested using a random-effect model, and bias was assessed using a funnel plot and an inspection of Egger's regression test. A p value, OR, and 95% CI were used to demonstrate an association.

Results

The pooled prevalence of poor QoL was 45.93% (36.04%, 55.83%), I2 = 98.6%, p < 0.001). Subgroup analysis showed that Ethiopia (48.09%; 95% CI = 33.73, 62.44), Egypt (43.51%; 95% CI = 21.84, 65.18), and Nigeria (43.49%; 95% CI = 12.25, 74.74) had the highest mean poor QoL prevalence of the countries. The pooled prevalence of poor QoL by diagnosis was as follows: bipolar disorder (69.63%; 95% CI = 47.48, 91.77), Schizophrenia (48.53%; 95% CI = 29.97, 67.11), group of mental illnesses (40.32%; 95% CI = 23.98, 56.66), and depressive disorders (38.90%; 95% CI = 22.98, 54.81). Being illiterate (3.63; 95% CI = 2.35, 4.91), having a comorbid medical illness (4.7; 95% CI = 2.75, 6.66), having a low monthly income (3.62; 95% CI = 1.96, 5.27), having positive symptoms (0.32; 95% CI = 0.19, 0.55), and having negative symptoms (0.26; 95% CI = 0.16, 0.43) were predictors of QoL. Thus, some factors are significantly associated with pooled effect estimates of QoL.

Conclusions

The current systematic review and meta-analysis showed that almost half of patients with mental illness had poor QoL. Being illiterate, having a comorbid medical condition, having a low monthly income, having positive symptoms, and having negative symptoms of mental illness were independent predictors of poor QoL. This systematic review and meta-analysis emphasize that poor QoL of people with mental illness in Africa needs attention to reduce its negative consequences.
Digitalization in Vulnerable Populations: A Systematic Review in Latin America
Authors: Espinosa Zárate Zaida , Camilli Trujillo Celia , Plaza-de-la-Hoz Jesús
Published: October 2023

The present systematic review seeks to collect and analyze relevant academic approaches to the effects of digitalization on the populations that live in vulnerable contexts in Latin America with the purpose of examining to which extent the ongoing universalization of information and communication technologies has the potential to improve the lives of the most disadvantaged in this region. For this aim, both theoretical as well as empirical studies on these populations were considered, as long as they were from Latin America with the aim of listening to the voice of those involved, thus avoiding assigning understandings of the phenomenon and solutions that are alien to the characteristics of the region. Five databases (SCOPUS, Web of Science, ERIC, Communication & Mass Media Complete and Dialnet) were consulted for the period 2001–2021. The analysis of the studies that met the inclusion criteria led to identifying seven themes that point to specific needs that must be met to advance development for the populations under study and that are useful for generating hypotheses for future effective interventions. Among them, some stand out: the specific demands of indigenous communities in the political agendas, the increasingly noticed opportunity for political empowerment through e-government, the development of a sense of belonging through technology, the potential of a digitally-mediated construction of personal identity, and the lack of enough consideration of cultural and situational factors that led to limited results in the implementation of digital public policies.
How do perceived teacher beliefs and classroom goal structures relate to motivations and enrollments in secondary school mathematics and English?
Authors: Watt Helen M. G. , Madjar Nir , Dacosta Liam
Published: October 2023

Our study examined how students’ perceived teacher beliefs and classroom goal structures, gender (of teachers and students) and own perceived talent, controlling for prior achievements, together explained motivational outcomes of students’ achievement goals, intrinsic value and enrollment choices in mathematics and English. Participants were 1086 grades 9–11 students (respective Ns = 380, 369, 337) from 3 coeducational middle-class schools in metropolitan Sydney, Australia. Hierarchical linear modeling revealed student-perceived teacher beliefs as the most consistent predictor of motivational outcomes in mathematics and English, over and above the effects of other measured influences. Perceived teacher beliefs moderated the effects of classroom goal structures, as well as relationships of gender with motivational outcomes in English. Grade-level effects were more positive among older students which coincided with the grade 11 transition.
Systematic review on the effectiveness of mobile health applications on mental health of breast cancer survivors
Authors: Horn Anna , Jírů-Hillmann Steffi , Widmann Jonas , Montellano Felipe A. , Salmen Jessica , Pryss Rüdiger , Wöckel Achim , Heuschmann Peter U.
Published: October 2023

Purpose

Breast cancer survivors are more likely to report psychological distress and unmet need for support compared to healthy controls. Psychological mobile health interventions might be used in follow-up care of breast cancer patients to improve their mental health.

Methods

We searched MEDLINE, PsychINFO, Cochrane and PROSPERO for articles on controlled trials examining the effectiveness of psychological mobile health interventions compared to routine care regarding mental health outcomes of adult breast cancer survivors. This review followed the PRISMA statement and was registered on PROSPERO (CRD42022312972). Two researchers independently reviewed publications, extracted data and assessed risk of bias.

Results

After screening 204 abstracts published from 2005 to February 2023, eleven randomised trials involving 2249 patients with a mean age between 43.9 and 56.2 years met the inclusion criteria. All interventions used components of cognitive behavioural therapy. Most studies applied self-guided interventions. Five studies reported percentages of patients never started (range = 3–15%) or discontinued the intervention earlier (range = 3–36%). No long-term effect > 3 months post intervention was reported. Three of seven studies reported a significant short-term intervention effect for distress. Only one study each showed an effect for depression (1/5), anxiety (1/5), fear of recurrence (1/4) and self-efficacy (1/3) compared to a control group.

Conclusions

A wide variance of interventions was used. Future studies should follow guidelines in developing and reporting their mobile interventions and conduct long-term follow-up to achieve reliable and comparable results.

Implications for cancer survivors

No clear effect of psychological mobile health interventions on patients’ mental health could be shown.

Registration

PROSPERO ID 312972.
Review on Neural Question Generation for Education Purposes
Authors: Al Faraby Said , Adiwijaya Adiwijaya , Romadhony Ade
Published: October 2023

Questioning plays a vital role in education, directing knowledge construction and assessing students’ understanding. However, creating high-level questions requires significant creativity and effort. Automatic question generation is expected to facilitate the generation of not only fluent and relevant but also educationally valuable questions. While rule-based methods are intuitive for short inputs, they struggle with longer and more complex inputs. Neural question generation (NQG) has shown better results in this regard. This review summarizes the advancements in NQG between 2016 and early 2022. The focus is on the development of NQG for educational purposes, including challenges and research opportunities. We found that although NQG can generate fluent and relevant factoid-type questions, few studies focus on education. Specifically, there is limited literature using context in the form of multi-paragraphs, which due to the input limitation of the current deep learning techniques, require key content identification. The desirable key content should be important to specific topics or learning objectives and be able to generate certain types of questions. A further research opportunity is controllable NQG systems, which can be customized by taking into account factors like difficulty level, desired answer type, and other individualized needs. Equally important, the results of our review also suggest that it is necessary to create datasets specific to the question generation tasks with annotations that support better learning for neural-based methods.
Structural model and capacity determination of underground reservoir in goaf: a case study of Shendong mining area in China
Authors: Wen Zhijie , Jiang Pengfei , Song Zhenqi , Jiang Yujing , Wen Jinhao , Jing Suolin
Published: October 2023

The large-scale extraction of coal resources in the western mining areas of China has resulted in a significant loss of water resources, which is a challenge for coordinating resource extraction with ecological preservation in the mining areas. Although underground reservoir technology can effectively solve this problem, measuring the storage capacity of underground reservoirs through engineering experiments is costly and time-consuming. Currently, there is a lack of accurate, reliable, and low-cost theoretical calculation solutions, which greatly restricts the promotion and application of underground reservoir technology. The theoretical calculation methods for underground reservoir capacity were studied based on parameters from the Shendong mining area in China. A water storage structure model for coal mine underground water reservoirs was established, taking into account the settlement boundaries of the bedrock and loose layers in shallow coal seams, based on the key layer theory and the spatial structure model of the mining roof. The mathematical expression for the load on the coal-rock mass in the goaf was derived considering the rock breaking characteristics of the mining roof. The model determined the range of each water storage area, including the zone of loose body, zone of gradual load, and the compacted zone, based on the strength of the water storage capacity. The key parameters for calculating the water storage capacity were determined using a modified model for shallow thick loose layers and thin bedrock movement. Finally, a calculation method for the storage capacity was obtained. Based on the real data from the 22,615 working face of a mine in the Shendong mining area, the water storage capacity of the underground reservoir in the goaf was jointly calculated using FLAC3D, Surfer 12.0 and the proposed calculation method. The calculated water storage capacity was approximately 1.0191 million m3. Although this result was 2.20% smaller than the on-site water pumping experiment data, it still verifies the feasibility of the above calculation method for determining the water storage capacity of underground water reservoirs.
Incorporating Publication into Graduate Seminars
Authors: Thompson Amy E. , Cobb Peter J.
Published: October 2023

Writing for publication will be central to students’ future careers, so learning this skill should be integral to their graduate training. In a recent graduate seminar, we set up an assignment for which students would write a digital review (DR) and receive periodic feedback on their work through an innovative mock peer-review roundtable workshop. Each student wrote a DR intended for actual publication in the journal Advances in Archaeological Practice. Students worked closely with the instructor and the journal editor on their individual topics, outlines, and abstracts. They also peer-reviewed each other's drafts and discussed their feedback as part of the roundtable workshop, which simulated real reviewers. Finally, each student wrote cover letters and prepared images for submission to the journal. This exercise demystified the peer-review process for students who had little prior knowledge about publication, prepared students for responding to reviewer comments from varying viewpoints, and helped students understand the additional steps involved in publication. Although it was challenging to scale this exercise to a large class, we hope that others will also try and share results from these types of authentic real-world training experiments to advance graduate pedagogy in our discipline and beyond.
How the Court’s path dependence affects its role as a relational actor
Authors: Davies Gareth
Published: October 2023

This Article draws on research into precedent and the European Court of Justice to argue that it is distinctive in almost never retreating from a standpoint it has taken, or overturning an earlier judgement, by contrast with other Supreme Courts where this is a more common occurrence. The Article then considers the implications of this finding for research into the relationship between the Court and other actors, such as Member States, litigants and institutions. It suggests that in considering how the Court may be influenced and constrained this research takes insufficient account of its apparently limited capacity to change doctrinal direction. Evidence of doctrinal path dependence needs to be a more central part of discussions of the Court as a relational actor.
The Court of Justice of the European Union as a legal field
Authors: Alexandris Polomarkakis Konstantinos
Published: October 2023

Reflexive sociology can contribute to a more holistic understanding of the role of the Court of Justice of the European Union (CJEU/Court) as a relational actor. This article draws on the Bourdieusian concept of (legal) field as an analytical framework to trace the power relations between the Court and its interlocutors. The analysis develops around four distinct conceptualisations of the Court as a legal field, ranging from its institutional architecture to the three mainstream judicial routes for a case to reach its docket (preliminary reference procedure, action for annulment and infringement procedure). These showcase the varied interactions among the different actors that either shape the Court as an institution or engage with it in the course of its adjudicative function. According to field theory, these interactions take the form of power struggles between the actors comprising a legal field in order to take control of the determination of the law. The actors of a legal field enjoy different positions that formulate their objective relations, and which are contingent on their disposition and capital. Each of the conceptualisations of the Court as a legal field in this article points to distinct power struggles and relations among a similar set of actors. Consequently, using field theory can be a very useful tool to contextualise the role of the Court and to systematically study its judgments, modus operandi and position in the European legal field under a reflexive lens that accentuates the significance of social space and power relations, and pushes for socio-legal and empirical insights.
Facing the fiction: can the European Union regulate fictitious commodities and capital?
Authors: Murray Ian J.
Published: October 2023

The years following the financial crisis of 2008 have witnessed a revival of interest in both the Polanyian concept of ‘fictitious commodities’ and the Marxian concept of ‘fictitious capital’. The former, with its focus on the consequences of markets for the ‘fictitious commodities’ of land, labour, and money, appears as a plausible explanation for our present instability along environmental, social, and economic axes. The latter, with its focus on what sets financial capitalists apart from their industrial counterparts, sheds light on what really separates Wall Street from Main Street, and what it all means for the prospects of class struggle in the 21st century. Building on a decade and a half of discourse on the role of these phenomena in financialisation, this paper explores the kinds of limits the law can place on high finance’s most flagrant flights of fancy. Taking as case studies the post-crisis efforts by the European Union (EU) to intervene in two key financial markets – private equity and securitisation – it asks how far current regulatory frameworks go, and what more can be done to protect Europe from capitalism’s excesses.
The welfare state between juridification and commodification: how the Frankfurt School gave up on economic democracy
Authors: Roth Bob
Published: October 2023

The aim of this contribution is to critically introduce and assess the Frankfurt School’s theory of late capitalism as it emerged in the 1970s, when a combined crisis of inflation and stagnation began to unravel the Keynesian orthodoxies of state-organised capitalism. In the process, Frankfurt theorists such as Jürgen Habermas and Claus Offe developed powerful critiques of commodification and juridification. The origins of their theory of late capitalism are first traced to the interwar debates on the Weimar Constitution – Germany’s first experiment in both constitutional and economic democracy. The rest of the Article takes a closer look at the Frankfurt School’s changing posture towards economic democracy in the 1970s. Accordingly, I first reiterate how the theory of late capitalism converged with that of the other major crisis theory of the time – the neo-conservative theory of ‘ungovernability’. In diagnosing the ‘governability crisis’ as a crisis of democracy, the Frankfurt School’s increasing pessimism about democracy’s economic reach becomes apparent. Secondly, by looking at the way the Frankfurt School perceived the emergence of the ‘neoliberal’ alternative in the early 1980s, I also argue that the theory of late capitalism had, and did, little to resist the de-democratisation of the economy through the rise of economic constitutionalism in the 1980s. As the welfare state was caught between the two logics of commodification and juridification, economic democracy was its unwitting victim.
Work hard and sleep better: Work autonomy attenuates the longitudinal effect of workaholism on sleep problem among Chinese working adults
Authors: Zhang Meng Xuan , Wu Anise M.S. , Zhang Ling Z. , Lam Long W.
Published: October 2023

The prevalence of workaholism has negative consequences on human health. Lack of sleep, a well-known problem among adults in modern society, is often attributed to overwork as a result of workaholism. Yet there is a lack of empirical research examining how and when workaholism will lead to sleep problems. To answer this question and to examine the longitudinal effect of workaholism on sleep in China, we investigate the mediating role of perceived evening responsibilities of work and the moderating effect of work autonomy. Two hundred and five Chinese working adults (58.0% female) voluntarily completed the online questionnaires at Time 1 (T1) and Time 2 (T2; 1-month later). Results showed that workaholism at T1 had a significant and positive correlation with sleep problem at T2. Further analysis suggested that perceived evening responsibilities of work fully mediated the relationship between workaholism and sleep problem. Work autonomy was shown to buffer the positive effect of workaholism on perceived evening responsibilities of work and attenuate the indirect effect of workaholism on sleep problem. While workers should be made aware of the negative impact of workaholism on sleep, organizations should also consider interventions to enhance employees’ autonomy and control of their work.
The influence of spectral bandwidth and shape on deep-water wave breaking onset
Authors: McAllister M.L. , Pizzo N. , Draycott S. , van den Bremer T.S.
Published: October 2023

Deep-water surface wave breaking affects the transfer of mass, momentum, energy and heat between the air and sea. Understanding when and how the onset of wave breaking will occur remains a challenge. The mechanisms that form unforced steep waves, i.e. nonlinearity or dispersion, are thought to have a strong influence on the onset of wave breaking. In two dimensions and in deep water, spectral bandwidth is the main factor that affects the roles these mechanism play. Existing studies, in which the relationship between spectral bandwidth and wave breaking onset is investigated, present varied and sometimes conflicting results. We perform potential-flow simulations of two-dimensional focused wave groups on deep water to better understand this relationship, with the aim of reconciling existing studies. We show that the way in which steepness is defined may be the main source of confusion in the literature. Locally defined steepness at breaking onset reduces as a function of bandwidth, and globally defined (spectral) steepness increases. The relationship between global breaking onset steepness and spectral shape (using the parameters bandwidth and spectral skewness) is too complex to parameterise in a general way. However, we find that the local surface slope of maximally steep non-breaking waves, of all spectral bandwidths and shapes that we simulate, approaches a limit of$1/\tan ({\rm \pi} /3)\approx 0.5774$. This slope-based threshold is simple to measure and may be used as an alternative to existing kinematic breaking onset thresholds. There is a potential link between slope-based and kinematic breaking onset thresholds, which future work should seek to better understand.
A multiple time scale approach for anisotropic inertial wave turbulence
Authors: Galtier Sébastien
Published: October 2023

Wave turbulence is the study of the long-time statistical behaviour of equations describing a set of weakly nonlinear interacting waves. Such a theory, which has a natural asymptotic closure, allows us to probe the nature of turbulence more deeply than the exact Kolmogorov laws by rigorously proving the direction of the cascade and the existence of an inertial range, predicting stationary spectra for conserved quantities, or evaluating the Kolmogorov constant. An emblematic example is given by fast rotating fluids for which a wave turbulence theory has been derived by Galtier (Phys. Rev. E, vol. 68, issue 1, 2003, p. 015301). This work involves non-trivial analytical developments for a problem that is anisotropic by nature. We propose here a new path for the derivation of the kinetic equation by using the anisotropy at the beginning of the analysis. We show that the helicity basis is not necessary to obtain the wave amplitude equation for the canonical variables that involve a combination of poloidal and toroidal fields. The multiple time scale method adapted to this anisotropic problem is then used to derive the kinetic equation that is the same as the original work when anisotropy is eventually taken into account. This result proves the commutativity between asymptotic closure and anisotropy. In addition, the multiple time scale method informs us that the kinetic equation can be derived without imposing restrictions on the probability distribution of the wave amplitude such as quasi-Gaussianity, or on the phase such as random phase approximation that naturally occurs dynamically.
DATING OF WOODEN HERITAGE OBJECTS IN THE GLIWICE 14C AND MASS SPECTROMETRY LABORATORY
Authors: Piotrowska Natalia , Kłusek Marzena , Boroń Piotr , Imiołczyk Ewelina , Budziakowski Mateusz , Poloczek Adrian , Poloczek-Imielińska Agata , Jaksik Marian
Published: October 2023

We present case studies on three objects of high importance for cultural heritage in southern Poland, dated in years 2018–2022 at the Gliwice 14C and Mass Spectrometry Laboratory with radiocarbon (14C) and dendrochronology methods. The first was a richly ornamented wooden cane, discovered during excavations on the market in Bytom city. The cane can be associated with medieval court proceedings. The archaeological context indicates the 13th century AD, and the 14C result corresponds perfectly with this time, confirming that it is the oldest object of this type in Poland. The second was a 4-m-tall oak column from St. Leonard Church in Lipnica Murowana, a UNESCO heritage site. The local story said it was previously devoted to Światowid, a pagan deity. Our analysis excluded the pre-Christian age, as the tree was felled no earlier than the late 15th century, which is in agreement with historical records. The third was a wooden Saint Lawrence Church in Bobrowniki. The presbytery was covered with up to five layers of polychromic paintings, some of high artistic value. We dated three samples from the original wooden board, and by wiggle-matching, the calibrated age interval was narrowed to 1731–1754 cal AD.
THREE PASSAGES OF ANCIENT PROLEGOMENA TO ARATUS
Authors: Thomas Oliver
Published: October 2023

An eighth-century Latin version of a Greek edition of Aratus preserves valuable ancient scholarship on the Phaenomena, including material not preserved in Greek. Examination of over thirteen thousand Latin–Greek correspondences enables one to interpret passages of the Latin that have so far resisted analysis, including information about an ancient edition equipped with critical signs and commentary, ancient discussion of the primary narratee in Aratus and Homer, and the alternative proem to Anclides (SH 84).
The prevalence of invertebrate bioerosion on Mesozoic marine reptile bone from the Jurassic and Cretaceous of the United Kingdom: new data and implications for taphonomy and environment
Authors: Jamison-Todd Sarah , Upchurch Paul , Mannion Philip D.
Published: October 2023

Invertebrate bioerosion on fossil bone can contribute to reconstructions of benthic taxonomic assemblages and inform us about oxygenation levels, water depth and exposure time on the seafloor prior to burial. However, these traces are not commonly described in the fossil record. To date, there have been only 13 published studies describing a total of 15 instances of invertebrate bioerosion on marine reptile fossil bones from the Mesozoic globally. We surveyed the collections of several UK museums with substantial occurrences of Mesozoic marine reptiles for evidence of invertebrate bioerosion. Here, we document 153 specimens exhibiting 171 newly recorded instances of invertebrate bioerosion on Jurassic and Cretaceous marine reptile bones. Several major bioeroding taxonomic groups are identified. Within the geological strata of the United Kingdom, there is a higher prevalence of bioerosion in the Cretaceous relative to the Jurassic, despite greater sampling of specimens from the Jurassic. Although biotic turnover and food web restructuring might have played a role, potentially pertaining to heightened productivity during the later stages of the Mesozoic Marine Revolution, we consider it more likely that this temporal change corresponds to differences in depositional environment and taphonomic history between the sampled rock units. In particular, the Cretaceous deposits are characterized by heightened oxygenation levels relative to their Jurassic counterparts, as well as reworking, which would have allowed two phases of bioerosion. A spatiotemporally broader dataset on invertebrate bioerosion on vertebrate bone will be important in further testing this and other hypotheses.
On the reducing projective dimension over local rings
Authors: Celikbas Olgur , Dey Souvik , Kobayashi Toshinori , Matsui Hiroki
Published: October 2023

In this paper, we are concerned with certain invariants of modules, called reducing invariants, which have been recently introduced and studied by Araya–Celikbas and Araya–Takahashi. We raise the question whether the residue field of each commutative Noetherian local ring has finite reducing projective dimension and obtain an affirmative answer for the question for a large class of local rings. Furthermore, we construct new examples of modules of infinite projective dimension that have finite reducing projective dimension and study several fundamental properties of reducing dimensions, especially properties under local homomorphisms of local rings.
Impaired coronary microvascular reactivity in youth with bipolar disorder
Authors: Kennedy Kody G. , Ghugre Nilesh R. , Roifman Idan , Qi Xiuling , Saul Kayla , McCrindle Brian W. , Macgowan Christopher K. , MacIntosh Bradley J. , Goldstein Benjamin I.
Published: October 2023

Background

Cardiovascular disease (CVD) is excessively prevalent and premature in bipolar disorder (BD), even after controlling for traditional cardiovascular risk factors. The increased risk of CVD in BD may be subserved by microvascular dysfunction. We examined coronary microvascular function in relation to youth BD.

Methods

Participants were 86 youth, ages 13–20 years (n = 39 BD, n = 47 controls). Coronary microvascular reactivity (CMVR) was assessed using quantitative T2 magnetic resonance imaging during a validated breathing-paradigm. Quantitative T2 maps were acquired at baseline, following 60-s of hyperventilation, and every 10-s thereafter during a 40-s breath-hold. Left ventricular structure and function were evaluated based on 12–15 short- and long-axis cardiac-gated cine images. A linear mixed-effects model that controlled for age, sex, and body mass index assessed for between-group differences in CMVR (time-by-group interaction).

Results

The breathing-paradigm induced a significant time-related increase in T2 relaxation time for all participants (i.e. CMVR; β = 0.36, p < 0.001). CMVR was significantly lower in BD v. controls (β = −0.11, p = 0.002). Post-hoc analyses found lower T2 relaxation time in BD youth after 20-, 30-, and 40 s of breath-holding (d = 0.48, d = 0.72, d = 0.91, respectively; all pFDR < 0.01). Gross left ventricular structure and function (e.g. mass, ejection fraction) were within normal ranges and did not differ between groups.

Conclusion

Youth with BD showed evidence of subclinically impaired coronary microvascular function, despite normal gross cardiac structure and function. These results converge with prior findings in adults with major depressive disorder and post-traumatic stress disorder. Future studies integrating larger samples, prospective follow-up, and blood-based biomarkers are warranted.
THE RISE, FALL, AND LEGACY OF THE STRUCTURE-CONDUCT-PERFORMANCE PARADIGM
Authors: Panhans Matthew T.
Published: October 2023

The Structure-Conduct-Performance paradigm was the core framework of industrial organization for two decades, and had a significant impact on competition policy from the 1950s through the 1970s. This essay considers what made the SCP framework so influential in the United States, the shortcomings economists identified in the framework during the shift to the “new IO” in the late 1970s, and the lasting contributions that the SCP paradigm made on policy and the study of industry and competition.
Characterizing the Impacts of Multi‐Scale Heterogeneity on Solute Transport in Fracture Networks
Authors: Sweeney Matthew R. , Hyman Jeffrey D. , O’Malley Daniel , Santos Javier E. , Carey J. William , Stauffer Philip H. , Viswanathan Hari S.
Published: October 2023

We model flow and transport in fracture networks with varying degrees of fracture‐to‐fracture aperture heterogeneity and network intensity to show how changes in these properties can cause the emergence of anomalous flow and transport behavior. If fracture‐to‐fracture aperture heterogeneity is increased in sparse networks, velocity fluctuations inhibit high flow rates and solute transport can be delayed. Surprisingly, transport can be slowed even in cases where hydraulic aperture is monotonically increased. As the intensity of the networks is increased, more connected pathways allow for particles to bypass these effects. There exists transition behavior where with relatively few connected pathways in a network, first arrival times of particles are not heavily affected by fracture‐to‐fracture aperture heterogeneity, but the scaling behavior of the tails is strongly influenced. These results reinforce the importance of considering multi‐scale effects in fractured systems and can inform flow and transport processes in both natural and engineered fractured systems.
Exposure to perfluoroalkyl and polyfluoroalkyl substances and pediatric obesity: a systematic review and meta-analysis
Authors: Frangione Brianna , Birk Sapriya , Benzouak Tarek , Rodriguez-Villamizar Laura A. , Karim Fatima , Dugandzic Rose , Villeneuve Paul J.
Published: October 2023

Introduction

Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are potentially obesogenic for children. We undertook a systematic review to synthesize this literature and explore sources of heterogeneity in previously published epidemiological studies.

Methods

Studies that collected individual-level PFAS and anthropometric data from children up to 12 years of age were identified by searching six databases. We excluded studies that only evaluated obesity measures at the time of birth. A full-text review and quality assessment of the studies was performed using the Office of Health Assessment and Translation (OHAT) criteria. Forest plots were created to summarize measures of association and assess heterogeneity across studies by chemical type and exposure timing. Funnel plots were used to assess small-study effects.

Results

We identified 24 studies, of which 19 used a cohort design. There were 13 studies included in the meta-analysis examining various chemicals and outcomes. Overall prenatal exposures to four different types of PFAS were not statistically associated with changes in body mass index (BMI) or waist circumference. In contrast, for three chemicals, postnatal exposures were inversely related to changes in BMI (i.e., per log10 increase in PFOS: BMI z-score of −0.16 (95% CI: −0.22, −0.10)). There was no substantial heterogeneity in the reported measures of association within prenatal and postnatal subgroups. We observed modest small-study effects, but correction for these effects using the Trim and Fill method did not change our summary estimate(s).

Conclusion

Our review found no evidence of a positive association between prenatal PFAS exposure and pediatric obesity, whereas an inverse association was found for postnatal exposure. These findings should be interpreted cautiously due to the small number of studies. Future research that can inform on the effects of exposure mixtures, the timing of the exposure, outcome measures, and the shape of the exposure-response curve is needed.
Epigenome-wide association study of peripheral immune cell populations in Parkinson’s disease
Authors: Andersen Maren Stolp , Leikfoss Ingvild Sørum , Brorson Ina Skaara , Cappelletti Chiara , Bettencourt Conceicao , Toft Mathias , Pihlstrøm Lasse
Published: October 2023

Understanding the contribution of immune mechanisms to Parkinson’s disease pathogenesis is an important challenge, potentially of major therapeutic implications. To further elucidate the involvement of peripheral immune cells, we studied epigenome-wide DNA methylation in isolated populations of CD14+ monocytes, CD19+ B cells, CD4+ T cells, and CD8+ T cells from Parkinson’s disease patients and healthy control participants. We included 25 patients with a maximum five years of disease duration and 25 controls, and isolated four immune cell populations from each fresh blood sample. Epigenome-wide DNA methylation profiles were generated from 186 samples using the Illumina MethylationEpic array and association with disease status was tested using linear regression models. We identified six differentially methylated CpGs in CD14+ monocytes and one in CD8 + T cells. Four differentially methylated regions were identified in monocytes, including a region upstream of RAB32, a gene that has been linked to LRRK2. Methylation upstream of RAB32 correlated negatively with mRNA expression, and RAB32 expression was upregulated in Parkinson’s disease both in our samples and in summary statistics from a previous study. Our epigenome-wide association study of early Parkinson’s disease provides evidence for methylation changes across different peripheral immune cell types, highlighting monocytes and the RAB32 locus. The findings were predominantly cell-type-specific, demonstrating the value of isolating purified cell populations for genomic studies.
A cost effective communication model for requirements elicitation in global software development
Authors: Rauf Muhammad Aqib , Bibi Sarfraz , Ali Sadia , AlSaedi Tahani , Ur Rehman Saif , Mahmood Khalid , Kundi Mahwish
Published: October 2023

Requirement elicitation stands as a pivotal activity within requirement engineering, gaining even greater significance in the context of global software development. Effective communication among stakeholders assumes paramount importance in this arena. Factors such as time zone disparities, cultural variations, and language differences exert a formidable impact on communication within the sphere of global software development. These dynamics inevitably impinge upon timely coordination, potentially compromising the software's quality. In response, researchers have proffered communication models tailored for requirement elicitation within the ambit of global software development. The purpose of this study is to conduct an in-depth critical review of existing communication models for demand elicitation in global software development. Through this comprehensive review, we aim to discern prevailing publication trends, provide an introductory overview, and illuminate the strengths and limitations inherent in the existing communication models. By identifying these limitations, we seek to advance a novel, low-cost communication approach designed primarily for demand elicitation in global software development. To culminate our endeavor, we will undertake a case study-based experiment, meticulously designed to assess the efficacy and practical utility of the proposed techniques.
Topology of turbulence within collisionless plasma reconnection
Authors: Hnat Bogdan , Chapman Sandra , Watkins Nicholas
Published: October 2023

In near-collisionless plasmas, which are ubiquitous in astrophysics, entropy production relies on fully-nonlinear processes such as turbulence and reconnection, which lead to particle acceleration. Mechanisms for turbulent reconnection include multiple magnetic flux ropes interacting to generate thin current sheets which undergo reconnection, leading to mixing and magnetic merging and growth of coherent structures, unstable reconnection current layers that fragment and turbulent reconnection outflows. All of these processes act across, and encompass, multiple reconnection sites. We use Magnetospheric Multi Scale four-point satellite observations to characterize the magnetic field line topology within a single reconnection current layer. We examine magnetopause reconnection where the spacecraft encounter the Electron Diffusion Region (EDR). We find fluctuating magnetic field with topology identical to that found for dynamically evolving vortices in hydrodynamic turbulence. The turbulence is supported by an electron-magnetohydrodynamic (EMHD) flow in which the magnetic field is effectively frozen into the electron fluid. Accelerated electrons are found in the EDR edge where we identify a departure from this turbulent topology, towards two-dimensional sheet-like structures. This is consistent with a scenario in which sub-ion scale turbulence can suppress electron acceleration within the EDR which would otherwise be possible in the electric field at the X-line.
Poor sleep quality, COPD severity and survival according to CASIS and Pittsburgh questionnaires
Authors: Sampol Júlia , Miravitlles Marc , Sáez María , Pallero Mercedes , Sampol Gabriel , Ferrer Jaume
Published: October 2023

Poor sleep quality is frequent among COPD patients and it has been related to worse outcomes. The objective of this study was to compare the COPD and Asthma Sleep Impact Scale (CASIS) and the generic Pittsburgh Sleep Quality Index (PSQI) questionnaires as reliable tools for evaluating sleep quality and its relationship with COPD characteristics and survival. Stable COPD patients were prospectively evaluated. Anthropometric, sociodemographic, comorbidity, lung function and treatment data were collected. All patients completed CASIS and PSQI, mMRC dyspnea severity scale, COPD Assessment Test (CAT), sleep apnoea STOP-Bang and Hospital Anxiety and Depression Scale (HADS) questionnaires. Body mass index, airflow Obstruction, Dyspnea and Exacerbations (BODEx) index was calculated. Life status was determined after a mean follow-up of 3.7 (SD 1) years. We included 200 patients, 69.5% male, mean age 65.8 (9) years. Poor sleep was detected in 100 (50%) and 84 patients (42%) according to PSQI and CASIS questionnaires, respectively, with an agreement of 63%. Poor sleep was related to female gender, more severe dyspnea and worse BODEx, HADS and CAT scores according to both questionnaires. PSQI was associated to chronic pain or inferior urinary tract symptoms and CASIS to exacerbations, shorter walked distance in the 6-min walking test and treatment with oral corticosteroids or chronic oxygen. Thirty nine (19.5%) patients died during follow-up. Mortality was not associated to PSQI nor CASIS results. Unlike PSQI, CASIS is more related to COPD severity and its results are not influenced by comorbidities with known impact on sleep quality. In our sample, poor sleep quality was not associated with increased mortality.