bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluating student levelling based on machine learning model’s performance
Authors: Ghareeb Shatha , Hussain Abir Jaafar , Al-Jumeily Dhiya , Khan Wasiq , Al-Jumeily Rawaa , Baker Thar , Al Shammaa Ahmed , Khalaf Mohammed
Published: May 2022

In this paper, a novel application of machine learning algorithms is presented for student levelling. In multicultural countries such as UAE, there are various education curriculums where the sector of private schools and quality assurance is supervising various private schools for many nationalities. As there are various education curriculums in United Arab Emirates, specifically Abu Dhabi, to meet expats’ needs, there are different requirements for registration and success. In addition, there are different age groups for starting education in each curriculum. Every curriculum follows different education methods such as assessment techniques, reassessment rules, and exam boards. Currently, students who transfer to other curriculums are not correctly placed to their appropriate year group as a result of the start and end dates of each academic year as well as due to their date of birth, in which students who are either younger or older for that year group can create gaps in their learning and performance. In addition, pupils’ academic journeys are not stored which create a gap for the schools to track their learning process. In this paper, we propose a computational framework applicable in multicultural countries such as United Arab Emirates in which multi-education systems are implemented. Machine Learning are used to provide the appropriate student’ level aiding schools to provide a smooth transition when assigning students to their year groups and provide levelling and differentiation information of pupils for a smooth transition between one education curriculums to another, in which retrieval of their progress is possible. For classification and discriminant analysis of pupils levelling, three machine learning classifiers are utilised including random forest classifier, Artificial Neural Network, and combined classifiers. The simulation results indicated that the proposed machine learning classifiers generated effective performance in terms of accuracy.
Implementation of a leisure reintegration programme for people with acquired brain injury in a community rehabilitation programme: a feasibility study
Authors: Alves-Stein Serena , George Stacey , Lannin Natasha A. , Jolliffe Laura
Published: May 2022

Background:

Participation in leisure activities is significantly impacted following acquired brain injury (ABI). Despite this being a common community rehabilitation goal, re-engagement with leisure activities following ABI is poorly addressed within Australian community rehabilitation services, which often cater to a mixed-diagnostic group of both ABI and non-ABI clients.

Objectives:

To evaluate the feasibility and effect of a leisure reintegration group programme within a community rehabilitation service.

Method:

A single-site, pre- and post-test feasibility study was conducted. Three cohorts of a semi-structured leisure group programme were offered, each conducted over eight sessions within 4 weeks. The Nottingham Leisure Questionnaire (NLQ) and Leisure Satisfaction Measure (LSM) were used as primary outcome measures. Measures of acceptability, including adherence, and a post-intervention participant survey were also completed.

Results:

Of the 14 consenting participants, 9 completed all outcome measures. Mean change score for the NLQ was −3.63 (p = 0.11) and the LSM 4.25 (p = 0.46). The programme was well attended (79%), acceptable for ABI and non-ABI participants and able to be implemented within an existing community rehabilitation service.

Conclusion:

Providing a leisure reintegration group programme met an identified need, developed client and carer capacity and could be delivered within a community rehabilitation service for clients with mixed diagnoses including ABI. A larger trial is warranted to examine the effectiveness and cost-effectiveness of this intervention for people with ABI.
PTSD and Depression 8 Years After the 2004 Tsunami in Sri Lanka
Authors: Ranasinghe Padmini D. , Zhang Xueyan , Hwang Jimin , Ranasinghe Pubudu M. , Karunathilake Indika M. , Everly George S.
Published: May 2022

Objectives:

To evaluate prevalence and risk factors of posttraumatic stress disorder (PTSD) and depression among directly exposed (DE) and indirectly or nonexposed (INE) populations in Sri Lanka 8 y after the Indian Ocean Tsunami in 2004.

Methods:

Population-based structured survey study was conducted among Sri Lankan adults living in 5 coastal districts, Hamboantha, Matara, Galle, Kalutara, and Colombo in 2012-2013. A total of 430 individuals, 325 in DE, 105 in INE, participated in the survey. DE and INE groups were compared for demographics and outcomes. Bivariate and multiple logistic regressions with backward selection were used to identify risk factors for partial PTSD and depression.

Results:

The prevalence of PTSD, partial PTSD and depression were 2.8%, 10.5%, and 18.8% in DE group, respectively. In multivariable analyses tsunami exposure, female gender, subjective physical health before the tsunami, previous trauma, and depression were significantly associated with partial PTSD. Female gender, high frequency of religious activity, previous trauma, social support, and PTSD were significantly associated with depression.

Conclusions:

The psychological impacts of the tsunami did wane over time, but still present at lower rate even in 8 y. It is important to address these lingering sequelae and expand access to at risk individuals.
Well-being and burnout in medical students: challenges and solutions
Authors: Bhugra D. , Molodynski A.
Published: May 2022

Medicine (like many others) can be an extremely stressful profession. The pressures faced by clinicians are often related to ‘life and death’ situations that can lead to high levels of stress and distress. Students and trainees in a variety of allied health professions face similar pressures related to study or work environments. The practice of medicine continuously evolves and changes, and so too do the pressures. If the correct support is not accessible, this can result in burnout. Medical students are generally at a vulnerable stage in life (18–24 years) when they are more likely to develop mental health problems. A recent focus on the mental health and well-being of medical students has highlighted various worrying trends with a series of studies from around the world highlighting surprisingly high rates of stress and burnout among medical students, and fairly similar contributory factors. Despite the challenge of defining and measuring burnout, these studies indicate an urgent need for changes in methods of teaching, alongside rapid access to support. In this editorial, we make some proposals that could help the next generation of doctors to look after themselves and their patients. Medical schools have a moral and ethical obligation to ensure the well-being of their students in these stressful times.
Myanmar's 2020 Election: Explaining the Strong Performance of the NLD and Some Ethnic Parties
Authors: Huang Kai-Ping
Published: May 2022

Aung San Suu Kyi's National League for Democracy (NLD) won another landslide victory in the 2020 general election. Although there was widespread dissatisfaction with the government's poor management of the economy and ethnic conflicts, as well as with the pre-electoral coordination of ethnic parties in several states, opposition and ethnic-based parties had failed to gain more seats. Previous explanations had focused on the economy, electoral system bias, weak party institutionalization, and vote splitting among ethnic parties; however, they underestimated the significance of two contextual factors: military dominance of politics and ethnic conflict. This article argues that military dominance hindered normal political development in Myanmar. The anti-military sentiment favored the NLD, which made most Bamar voters disregard the party's poor economic performance. Despite the electoral system's bias, prolonged ethnic conflicts made ethnic parties that had fought for their community's causes more likely to maintain support. These arguments are verified by survey and electoral data sets. The military nullified the 2020 election claiming that electoral fraud was to blame, but the findings indicate that it was the political environment the military created that led to the victory of the NLD and some ethnic parties in the first place.
Direct numerical simulation of supersonic turbulent flows over rough surfaces
Authors: Modesti Davide , Sathyanarayana Srikanth , Salvadore Francesco , Bernardini Matteo
Published: May 2022

We perform direct numerical simulation of supersonic turbulent channel flow over cubical roughness elements, spanning bulk Mach numbers

$M_b=0.3$

–

$4$

, both in the transitional and fully rough regime. We propose a novel definition of roughness Reynolds number which is able to account for the viscosity variations at the roughness crest and should be used to compare rough-wall flows across different Mach numbers. As in the incompressible flow regime, the mean velocity profile shows a downward shift with respect to the baseline smooth wall cases, however, the magnitude of this velocity deficit is largely affected by the Mach number. Compressibility transformations are able to account for this effect, and data show a very good agreement with the incompressible fully rough asymptote, when the relevant roughness Reynolds number is used. Velocity statistics present outer layer similarity with the equivalent smooth wall cases, however, this does not hold for the thermal field, which is substantially affected by the roughness, even in the channel core. We show that this is a direct consequence of the quadratic temperature–velocity relation which is also valid for rough walls. Analysis of the heat transfer shows that the relative drag increase is always larger than the relative heat transfer enhancement, however, increasing the Mach number brings data closer to the Reynolds analogy line due to the rising relevance of the aerodynamic heating.
Belonging in Exile: James Baldwin in Paris
Authors: Siddiqui Mona
Published: May 2022

James Baldwin’s autobiographical essay “Equal in Paris” is a perceptive and often amusing account of the American writer’s first visit to Paris. An aspiring novelist who left America in rage over his experience of the country’s injustice and contempt toward Black Americans, Baldwin is acutely aware of racial prejudice in majority white societies. He tells of his experience of staying in a dilapidated hotel, of being wrongly accused of theft and then imprisoned in a Paris jail for more than a week over Christmas. Baldwin’s astute observations of Parisian life and its institutions, show how as a Black American, he struggles to understand this new cultural environment which like most Western societies, has its own form of racism. But this is also a story of an artist’s search for a new intellectual home where he can breathe freely and write. His new friendships with other artists and observations about cosmopolitan European life, allow him to assess what it means to be an American in Paris. This includes exploring those social attitudes that divide America and Europe and those that are universal.
New Research on the Intihuasi Cave, San Luis, Argentina: Implications for the Peopling of the Southern Cone of South America
Authors: Heider Guillermo , Curtoni Rafael , Borgo Mariangeles , Chiesa Jorge , Oliván Augusto , Martínez Quirós Víctor
Published: May 2022

In this report, we present a new 14C of 9627–9490 cal BC (8640 ± 30 BP) obtained at the Intihuasi Cave, San Luis, Argentina. The sample was obtained during fieldwork conducted as part of a new management plan for tourist use of the site. Intihuasi has played a central role in the history of archaeological investigations in South America. There, in 1951 González applied for the first time a systematic methodology for archaeological excavations in Argentina. Moreover, he complemented his field results with the obtainment of the first radiocarbon dates for the Southern Cone of South America. These achievements allowed him to build the first macroregional chronological sequence, which is still partially used. The new radiocarbon date presented in this article aims to reconsider the importance of the Intihuasi Cave for the discussion of the macroregional peopling of the Southern Cone of South America. We believe that the site ratifies the occurrence of an Andean population vector in the region.
To Whom It Belongs: The Aftermaths of Afrocubanismo and the Power overLo Negroin Cuban Arts, 1938–1958
Authors: García Yero Cary Aileen
Published: May 2022

This article explores the impact of Afrocubanismo on the development of Cuba’s arts during the 1940s and 1950s. The article follows the discursive output of artists, intellectuals, and cultural policymakers of different racial backgrounds over the deployment oflo negroto constructcubanidad. It argues that, if the 1920s and 1930s experienced a movement towards the construction of a homogeneous mestizo Cuba, the following decades reveal an effort by some artists to desyncretizelo cubano. While some intellectuals constructed notions of authenticity that circumscribed black art to black artists, many white Cuban artists in turn embraced elite Hispanic heritage as their main creative language while valorizing some Afro-Cuban artists’ recreations oflo negro. The article also demonstrates that the scholarly debates about cultural appropriation in recent decades have a long history within the Afro-Cuban community. It shows how Afro-Cuban artists and intellectuals pioneered arguments about the exploitative use oflo negroto make national art and the central role of culture in shaping racial inequality.
Transitional Justice: Comparative and Historical Perspectives from Latin America
Authors: Encarnación Omar G.
Published: May 2022

This essay reviews the following works:

Memory’s Turn: Reckoning with Dictatorship in Brazil. By Rebecca J. Atencio. Madison: University of Wisconsin Press, 2014. Pp. xviii + 144. $26.95 paperback. ISBN: 9780299297244.

Human Rights Policies in Chile: The Unfinished Struggle for Truth and Justice. By Silvia Borzutzky. Cham, Switzerland: Palgrave Macmillan, 2017. Pp. 242. $119.99 paperback. ISBN: 9783319536965.

Intermittences: Memory, Justice, and the Poetics of the Visible in Uruguay. By Ana Forcinito. Pittsburgh: University of Pittsburgh Press, 2018. Pp. xii + 257. $29.95 paperback. ISBN: 9780822965664.

Democratization and Memories of Violence: Ethnic Minority Rights Movements in Mexico, Turkey, and El Salvador. By Mneesha Gellman. London: Routledge, 2016. Pp. xv + 242. $52.95 paperback. ISBN: 9781138597686.

Reagan’s Gun-Toting Nuns: The Catholic Conflict over Cold War Human Rights Policy in Central America. By Theresa Keeley. Ithaca, NY: Cornell University Press, 2020. Pp. xiv + 352. $49.95 hardcover. ISBN: 9781501750755.

Sovereign Emergencies: Latin America and the Making of Global Human Rights Politics. By Patrick William Kelly. New York: Cambridge University Press, 2018. Pp. xx + 318. $29.99 paperback. ISBN: 9781316615119.

The Brazilian Truth Commission: Local, National and Global Perspectives. Edited by Nina Schneider. New York: Berghahn, 2019. Pp. 382. $135.00 hardcover. ISBN: 9781789200034.

Phenomenal Justice: Violence and Morality in Argentina. By Eva van Roekel. New Brunswick, NJ: Rutgers University Press, 2020. Pp. 208. $32.95 paperback. ISBN: 9781978800267.

Los pelotones de la muerte: La construcción de los perpetradores del genocidio guatemalteco. By Manolo E. Vela Castañeda. México, DF: Colegio de México, 2015. Pp. 454. $32.03 paperback. ISBN: 9786074623680.

Acts of Repair: Justice, Truth, and the Politics of Memory in Argentina. By Natasha Zaretsky. New Brunswick, NJ: Rutgers University Press, 2020. Pp. 252. $34.95 paperback. ISBN: 9781978807426.
Performance Art, Race, and Contemporaneity in the Dominican Republic
Authors: Garrido Castellano Carlos
Published: May 2022

This essay discusses issues of time and temporality in relation to performance art from the Dominican Republic. It contends that Dominican performance artists are advancing critical understandings of what is to be contemporary. The essay considers the work of David Pérez “Karmadavis,” Sayuri Guzmán, and José Ramia as expressing the role of artists in defining and delving into what it means to make art in and of the present, while simultaneously challenging the presentist understanding of time linked to neoliberalism. From this perspective, the article examines the potential of performance art for criticizing and expanding our understanding of time and temporality.
Revolución de los papeles: Una mirada desde la Revista de la Universidad Técnica del Estado (1969–1973) al proceso de la Reforma Universitaria en Chile
Authors: Torres Vásquez Rita
Published: May 2022

La Revista de la Universidad Técnica del Estado (1969–1973) fue una publicación periódica de carácter académico que tuvo como objetivo difundir el proceso de transformación de esta casa de estudios gracias al movimiento de la Reforma Universitaria. Estuvo inmersa en la transición política del régimen demócrata cristiano de Eduardo Frei Montalva al programa de gobierno de carácter socialista de Salvador Allende. Su producción editorial e impresión estuvo a cargo de la Editorial UTE y el Taller Gráfico UTE respectivamente, áreas de trabajo relacionadas a la labor de extensión de la universidad. Este artículo pretende establecer un diálogo entre esta publicación y su contexto político-educativo, por medio de la revisión de su variedad temática, autoral y formatos de escritura. Finalmente, se busca visibilizar las dinámicas y experiencias del trabajo de diseño de la revista, a través del análisis de su producción visual (portadas y portadillas gráficas) y el rescate testimonial de integrantes del grupo de diseñadores responsables de cada ejemplar, información inédita hasta el momento.
Preservation and Accessibility of the Audiovisual Document of the Trial of the Argentine Military Junta
Authors: Osuna Alarcón Maria R.
Published: May 2022

This research note outlines the current state of preservation and accessibility of an audiovisual document that contains complete video footage of the Trial of the Argentine Military Junta, whose verdict in 1985 found the accused guilty of crimes against humanity perpetrated during the last military dictatorship in Argentina (1976–1983).The project of digitization is the result of a joint effort by the University of Salamanca, the Argentine human rights organization Memoria Abierta, and the judges involved in the case, with the support of the Argentine Cámara Nacional de Apelaciones en lo Criminal y Correccional Federal. Its two main objectives are to preserve and provide open access to the audiovisual document. To date only digitized preservation has been attained, a nonetheless remarkable achievement. Despite legislation dates enforcing the protection of the parties involved in the trial, and the absence of legal constraints, open access to the document has not been obtained.
THE BOUNDARY OF THE p-RANK STRATUM OF THE MODULI SPACE OF CYCLIC COVERS OF THE PROJECTIVE LINE
Authors: OZMAN EKIN , PRIES RACHEL , WEIR COLIN
Published: May 2022

We study the p-rank stratification of the moduli space of cyclic degree
$\ell $
covers of the projective line in characteristic p for distinct primes p and
$\ell $
. The main result is about the intersection of the p-rank
$0$
stratum with the boundary of the moduli space of curves. When
$\ell =3$
and
$p \equiv 2 \bmod 3$
is an odd prime, we prove that there exists a smooth trielliptic curve in characteristic p, for every genus g, signature type
$(r,s)$
, and p-rank f satisfying the clear necessary conditions.
Sex Differences in Sexual Desire
Authors: Stegenga Jacob
Published: May 2022

The standard view about sex differences in sexual desire is that males are lusty and loose, while females are cool and coy. This is widely believed and is a core premise of some scientific programs like evolutionary psychology. But is it true? A mountain of evidence seems to support the standard view. Yet, this evidence is shot through with methodological and philosophical problems. Developments in the study of sexual desire suggest that some of these problems can be resolved, and when they are, the standard view looks, at best, to be an exaggeration.
Environmental changes in SW France during the Middle to Upper Paleolithic transition from the pollen analysis of an eastern North Atlantic deep-sea core
Authors: Fourcade Tiffanie , Sánchez Goñi María Fernanda , Lahaye Christelle , Rossignol Linda , Philippe Anne
Published: May 2022

Evaluating synchronies between climate and cultural changes is a prerequisite for addressing the possible effect of environmental changes on human populations. Searching for synchronies during the Middle-Upper Paleolithic transition (ca. 48–36 ka) is hampered by the limits of radiocarbon dating techniques and the large chronological uncertainties affecting the archaeological and paleoclimatic records, as well by their low temporal resolution. Here, we present a high-resolution, pollen-based vegetation record from the Bay of Biscay, sea surface temperature changes, additional14C ages, and a new IRSL date on the fine-sediment fraction of Heinrich Stadial (HS) 6. The IRSL measurements give an age of ca. 54.0 ± 3.4 ka. The paleoclimatic results reveal a succession of rapid climatic changes during the Middle-Upper Paleolithic transition in SW France (i.e. D-O 12–8 and two distinct climatic phases during HS 4). Comparison of the new paleoclimatic record with chronologically well-constrained regional archaeological changes shows that no synchronies exist between cultural transitions and environmental changes. The disappearance of Neanderthals and the arrival ofHomo sapiensin SW France encompassed a long-term forest opening, suggesting thatHomo sapiensmay have progressively replaced Neanderthals from D-O 10 to HS 4 through competition for the same ecological niches.
NEW SAMPLE PREPARATION LINE FOR RADIOCARBON MEASUREMENTS AT THE GXNU LABORATORY
Authors: Shen Hongtao , Tang Junsen , Wang Li , Qi Mingli , Li Zhaomei , Wei Siyu , Sasa Kimikazu , Shi Shulin , Zhang Guofeng , Chen Dingxiong , Qi Linjie , Wang Ning , Zhou Houbing , He Ming , Zhao Qingzhang , He Yun
Published: May 2022

A new system for preparing 14C samples was established for a compact accelerator mass spectrometer (GXNU-AMS) at Guangxi Normal University. This sample preparation system consists of three units: a vacuum maintenance unit, a CO2 purification unit, and a CO2 reduction unit, all of which were made of quartz glass. A series of radiocarbon (14C) preparation experiments were conducted to verify the reliability of the system. The recovery rate of graphite obtained was more than 80%. The carbon content in the commercial toner and wood sample was linearly fitted to the CO2 pressure in the measurement unit of the system. The results showed a good linear relationship, indicating that the reliability of the sample preparation system. AMS measurements were conducted on a batch of standard, wood, and dead graphite samples prepared using this system. The results showed that the beam current of 12C- for each sample was more than 40 μA, the carbon contamination introduced during the sample preparation process was ∼ 2 × 10–15, and that the new sample preparation system is compact, low-contamination, and efficient and meets the GXNU-AMS requirements for 14C samples.
EULER–KRONECKER CONSTANTS FOR CYCLOTOMIC FIELDS
Authors: HONG LETONG , ONO KEN , ZHANG SHENGTONG
Published: May 2022

The Euler–Mascheroni constant
$\gamma =0.5772\ldots \!$
is the
$K={\mathbb Q}$
example of an Euler–Kronecker constant
$\gamma _K$
of a number field
$K.$
In this note, we consider the size of the
$\gamma _q=\gamma _{K_q}$
for cyclotomic fields
$K_q:={\mathbb Q}(\zeta _q).$
Assuming the Elliott–Halberstam Conjecture (EH), we prove uniformly in Q that
$$ \begin{align*} \frac{1}{Q}\sum_{Q<q\le 2Q} |{\gamma_q - \log q}| = o(\log Q).\end{align*} $$

In other words, under EH, the
$\gamma _q /\!\log q$
in these ranges converge to the one point distribution at
$1$
. This theorem refines and extends a previous result of Ford, Luca and Moree for prime
$q.$
The proof of this result is a straightforward modification of earlier work of Fouvry under the assumption of EH.
ANAMNÊSISASANEURISKEIN, ANAKINEINANDANALAMBANEININ PLATO'SMENO
Authors: Shepardson Douglas A.
Published: May 2022

This article examines the theory of recollection in Plato'sMenoand attempts to unravel some long-standing puzzles about it. What are the prenatal objects of the soul's vision? What are the post-natal objects of the soul's recollection? What is innate in theMeno? Why does Socrates (prima facie) suggest that both knowledge and true opinion are innate? The article pays particular attention to theana-prefix in the verbsaneuriskô,anakineôandanalambanô, and suggests that they are used for two distinct stages of recollection: a phenomenological stage of ‘finding again’ or ‘awakening’ our innate content, which Plato callsdoxa, and an epistemic stage of ‘getting it back’ asepistêmê.Thinking of the verbs with this ‘back/again’ sense of theana-prefix (instead of as ‘up’, in the common translation ofanalambanôas ‘take up’) allows us to understand why Plato would simultaneously imply that our souls had prenatalepistêmê, have post-natal innate true opinion and have the potential toanalambanein epistêmê. He is not talking about ‘taking up’epistêmêthat he also callsdoxa, but about ‘getting back’ theepistêmêwe had prenatally. The article concludes with an examination of what this innate content is, suggesting that it is a type of ‘principle’ and ‘essential’ mental content.
Continuous versus punctuated vein widening in the Marcellus Formation, USA: the fine line between pressure fringes and hydraulic fractures
Authors: Hooker JN , Cartwright J , Stephenson B , Day CC
Published: May 2022

Calcite veins are common in organic-rich mudrocks, but their genesis and ability to transmit fluids are debated. A combined microstructural and isotopic investigation of an array of calcite veins recovered in core from the Marcellus Formation reveals that the veins grew via a combination of continuous fibrous growth and punctuated fracture-opening increments. Continuous opening is the result of pressure-solution creep and involves no mechanical fracturing, but rather the growth of a pressure fringe around a pre-existing, sealed fracture. In contrast, incremental opening is accomplished by overpressured, mineral-saturated fluid, which repeatedly ruptures the rock at the cement / host-rock interface. Punctuated growth increments occurred repeatedly throughout an otherwise protracted, continuous growth history, indicating that the present structures preserve hybrid deformation conditions between brittle, fluid-assisted cracking and plastic strain. Stable isotopic signatures match those of a regional opening-mode fracture set that formed in response to catagenetic fluid overpressures amid a tectonically imposed (Alleghanian) stress field. It is concluded that calcite veins form as opening-mode hydraulic fractures and are susceptible to increments of brittle reactivation, even while inelastic growth processes widen and fill the veins with fibrous cement.
Can cultural values associated with turacos be used to enhance biodiversity conservation in Cameroon?
Authors: Nkengbeza Standly Nkemnyi , Nja Beltin T. , Younchahou Mfonkwet Njiaghait , Nana Eric Djomo
Published: May 2022

Turacos are birds used as status symbols in certain African cultures. Despite this cultural value, turacos are increasingly threatened by habitat loss and illegal hunting. We tested the hypothesis that the high cultural value associated with turacos means local people are willing to conserve them and their habitats. To this end, we examined the traditional uses of turacos and how their cultural value could facilitate conservation interventions. We administered an open-ended questionnaire to 180 households during January 2017–November 2019. We found the feathers of three species of turacos to be associated with qualities such as social esteem and power: Bannerman's turaco Tauraco bannermani (categorized as Endangered on the IUCN Red List), green turaco Tauraco persa (Least Concern) and great blue turaco Corythaeola cristata (Least Concern). People were generally supportive of efforts to protect turacos because of a strong connection between these birds and the local culture, supporting our hypothesis. This particularly applied to people of high social standing such as chiefs and village elders who use turaco feathers to gain public distinction. Feathers were also used by herbalists for traditional medicine, and hunters used the birds’ calls as a time indicator. Feathers are generally obtained through opportunistic collection and a sustainable, traditional hunting system, but we also found that some people hunt turacos to sell them as pets. We recommend that conservation interventions make use of the cultural values associated with these iconic species, together with implementing alternative sources of livelihoods, to promote behaviours that help achieve conservation objectives in the area.
Continuity of psychopathology v. resilience across the transition to adolescence: role of hair cortisol and sensitive caregiving
Authors: Yirmiya Karen , Motsan Shai , Zagoory-Sharon Orna , Schonblum Anat , Koren Lee , Feldman Ruth
Published: May 2022

Background

The transition to adolescence implicates heightened vulnerability alongside increased opportunities for resilience. Contexts of early life stress (ELS) exacerbate risk; still, little research addressed biobehavioral mediators of risk and resilience across the adolescent transition following ELS. Utilizing a unique cohort, we tested biosocial moderators of chronicity in adolescents’ internalizing disorders v. resilience.

Method

Families exposed to chronic war-related trauma, v. controls, were followed. We utilized data from three time-points framing the adolescent transition: late childhood (N = 177, Mage = 9.3 years ± 1.41), early adolescence (N = 111, Mage = 11 0.66 years ± 1.23), and late adolescence (N = 138, Mage = 15.65 years ± 1.31). In late childhood and late adolescence children's internalizing disorders were diagnosed. At early adolescence maternal and child's hair cortisol concentrations (HCC), maternal sensitivity, and mothers’ post-traumatic symptoms evaluated.

Results

War-exposed children exhibited more internalizing disorders of chronic trajectory and mothers were less sensitive and more symptomatic. Three pathways elucidated the continuity of psychopathology: (a) maternal sensitivity moderated the risk of chronic psychopathology, (b) maternal post-traumatic symptoms mediated continuity of risk, (c) trauma exposure moderated the association between child internalizing disorders at late childhood and maternal HCC, which linked with child HCC. Child HCC linked with maternal post-traumatic symptoms, which were associated with child disorders in late adolescence.

Conclusion

Results demonstrate the complex interplay of maternal and child's biosocial factors as mediators and moderators of risk chronicity across the adolescent transition following trauma. Findings are first to utilize maternal and child's HCC as biomarkers of chronic stress v. resilience during adolescence, a period of neural reorganization and personal growth that shapes the individual's lifetime adaptation.
The politics of pain: Medicaid expansion, the ACA and the opioid epidemic
Authors: Shepherd Michael E.
Published: May 2022

Federalism allows state politicians opportunities to undermine or support for federal policies. As a result, voters often have varied impressions of the same federal programmes. To test how this dynamic affects voting behaviour, I gather data on the severity of the opioid epidemic from 2006–2016. I exploit discontinuities between states that expanded Medicaid and those that did not to gain causal leverage over whether expansion affected the severity of the epidemic and whether these policy effects affected policy feedback. I show that the decision to expand Medicaid reduced the severity of the opioid epidemic. I also show that expanding Medicaid and subsequent reductions in the severity of the opioid epidemic increased support for the Democratic Party. The results imply that the Republican Party performed better in places where voters did not have access to Medicaid expansion and where the epidemic worsened, demonstrating an unintended consequence of federalism on policy feedback.
Profiles of diurnal cortisol and DHEA regulation among children: Associations with maltreatment experiences, symptomatology, and positive adaptation
Authors: Handley Elizabeth D. , Rogosch Fred A. , Duprey Erinn B. , Russotti Justin , Cicchetti Dante
Published: May 2022

Person-centered methods represent an important advance in the simultaneous examination of multiple indicators of neuroendocrine functioning and may facilitate a more nuanced understanding of the impact of child maltreatment on hypothalamic–pituitary–adrenal axis dysregulation. The aims of the present study were threefold: (a) identify naturally occurring patterns of diurnal cortisol and dehydroepiandrosterone (DHEA) regulation among a sample of N = 1,258 children with and without histories of maltreatment, (b) investigate which neuroendocrine profiles characterize children with exposure to maltreatment, and (c) examine which profiles are related to adaptive outcomes and symptomatology among children. Cortisol and DHEA were sampled three times per day (9 a.m., 12 p.m., and 4 p.m.) across 5 and 2 days, respectively. Four profiles of cortisol and DHEA regulation were identified. Among females, a pattern marked by high cortisol and low DHEA was associated with more pervasive maltreatment experiences. Furthermore, we found evidence of adaptive interpersonal resilience such that children with maltreatment exposure who evidenced this pattern of high cortisol and low DHEA were viewed as more likeable than maltreated children with other neuroendocrine patterns. Finally, results pointed to higher levels of internalizing symptoms among children who displayed a profile marked by average cortisol and high DHEA.
Sociocultural dimensions of early dual language learning
Authors: Genesee Fred
Published: May 2022

Titone and Tiv'sSystems Theory of Bilingualismaims to “urge cognitive scientists and neuroscientists to better embrace sociolinguistic and sociocultural experiences as part of their theoretical and empirical purview”. No stronger case for such a framework can be found than in studies of developmental aspects of bilingualism. In fact, inclusion of sociocultural variation has been a common feature of many studies of dual language learning for some time, especially in studies of pre-school and early-school-age learners (see Genesee, 2019, for a review). Young dual language learners – neonates, infants and toddlers, exposed to more than one language – begin life as virtualtabula rasaand are capable of learning any language with facility. As a result, their language acquisition is necessarily tied to the sociocultural parameters of the learning environments they are exposed to. Moreover, as Titone and Tiv emphasize, the immediate and ultimate purpose of language learning is communication. Thus, young dual language learners must be attuned to and acquire the sociocultural constraints and norms for communicating effectively in more than one language. While sociocultural variation is important for understanding language acquisition even among monolingual children living in relatively homogeneous monocultural environments, sociocultural variation is inherent and, indeed, enhanced in the learning environments of children acquiring more than one language insofar as each language is intimately linked with different socio-cultural parameters. Sociocultural variation can be important for understanding bilingualism in yet another way. In studies of the neuro-cognitive consequences of bilingualism, it has been reported that there is a more pronounced association between dual language exposure and activation of certain brain areas among adolescent bilinguals from relatively low SES backgrounds than bilinguals from relatively high SES backgrounds (Brito & Noble, 2018). Inclusion of sociocultural variation in research on the effects of bilingualism can reveal a more nuanced view than emerges if such variation is not considered.
An Unexpected Alteration Colonic Mucus Appearance in the Constipation Model via an Intestinal Microenvironment
Authors: Gao Han , Gao Chen-chen , Wang Tian-tian , Gao Lei , Li Guang-wen , Jin Liang-yun , He Cheng-wei , Wang Bo-ya , Zhang Lucia , Guo Yue-xin , Hua Rong-xuan , Shang Hong-wei , Xu Jing-dong
Published: May 2022

Due to the lack of research between the inner layers in the structure of colonic mucous and the metabolism of fatty acid in the constipation model, we aim to determine the changes in the mucous phenotype of the colonic glycocalyx and the microbial community structure following treatment with Rhubarb extract in our research. The constipation and treatment models are generated using adult male C57BL/6N mice. We perform light microscopy and transmission electron microscopy (TEM) to detect a Muc2-rich inner mucus layer attached to mice colon under different conditions. In addition, 16S rDNA sequencing is performed to examine the intestinal flora. According to TEM images, we demonstrate that Rhubarb can promote mucin secretion and find direct evidence of dendritic structure-linked mucus structures with its assembly into a lamellar network in a pore size distribution in the isolated colon section. Moreover, the diversity of intestinal flora has noticeable changes in constipated mice. The present study characterizes a dendritic structure and persistent cross-links have significant changes accompanied by the alteration of intestinal flora in feces in models of constipation and pretreatment with Rhubarb extract.
Dynamics around the binary system (65803) Didymos
Authors: Machado Oliveira R. , Winter O. C. , Sfair R. , Valvano G. , Moura T. S. , Borderes-Motta G.
Published: May 2022

Didymos and Dimorphos are primary and secondary, respectively, asteroids who compose a binary system that make up the set of Near Earth Asteroids (NEAs). They are targets of the Double Asteroid Redirection Test (DART), the first test mission dedicated to study of planetary defense, for which the main goal is to measure the changes caused after the secondary body is hit by a kinect impactor. The present work intends to conduct a study, through numerical integrations, on the dynamics of massless particles distributed in the vicinity of the two bodies. An approximate shape for the primary body was considered as a model of mass concentrations (mascons) and the secondary was considered as a massive point. Our results show the location and size of stable regions, and also their lifetime.
Characterization of the stability for trajectories exterior to Jupiter in the restricted three-body problem via closed-form perturbation theory
Authors: Rossi Mattia , Efthymiopoulos Christos
Published: May 2022

We address the question of identifying the long-term (secular) stability regions in the semi-major axis-eccentricity projected phase space of the Sun-Jupiter planar circular restricted three-body problem in the domains i) below the curve of apsis equal to the planet’s orbital radius (ensuring protection from collisions) and ii) above that curve. This last domain contains several Jupiter’s crossing trajectories. We discuss the structure of the numerical stability map in the (a,e) plane in relation to manifold dynamics. We also present a closed-form perturbation theory for particles with non-crossing highly eccentric trajectories exterior to the planet’s trajectory. Starting with a multipole expansion of the barycentric Hamiltonian, our method carries out a sequence of normalizations by Lie series in closed-form and without relegation. We discuss the applicability of the method as a criterion for estimating the boundary of the domain of regular motion.
Oscillations around tidal pseudo-synchronous solutions for circumbinary planets
Authors: Zoppetti F. A. , Folonier H. , Leiva A. M. , Beaugé C.
Published: May 2022

Tidal evolution of low-eccentric circumbinary planets is expected to drive the rotational evolution toward a pseudo-synchronous solution. In this work, we present a study of the oscillation amplitudes around this state by considering that the two central stars exert creep tides on the planet. These amplitudes are computed by direct numerical integrations of the creep equations and also by means of the calculation of the coefficients of the periodic terms in this stationary solution. As in the two-body-problem, the planetary spin and lag-angle are observed to have maximum oscillation amplitudes for stiff bodies and almost null oscillation for the gaseous regime, while the opposite behaviour is observed in the equatorial and polar flattenings. Our analytical approximation shows to be very accurate and specially necessary for very-low eccentric planets. However, the magnitudes of the oscillation amplitudes around the pseudo-synchronous solution in the circumbinary problem appears to be very small respect to the mean value. Thus, considering these oscillation in the computation of the tidal energy dissipation may not have a substantial contribution in the results, at least compared to the case in which only the mean values are taken into account.
Probabilistic evolution of pairs of trans-Neptunian objects in close orbits
Authors: Kuznetsov Eduard , Al-Shiblawi Omar , Gusev Vladislav
Published: May 2022

We have studied the probabilistic evolution of four candidates for young pairs of trans-Neptunian objects: 2003 QL91 – 2015 VA173, 1999 HV11 – 2015 VF172, 2002 CY154 – 2005 EW318 and 2013 SD101 – 2015 VY170 over 10 Myr in the past. All pairs belong to cold Classical Kuiper Belt objects. We concluded that the age of the considered pairs exceeds 10 Myr.
Closed-form perturbation theory in the Sun-Jupiter restricted three body problem without relegation
Authors: Cavallari Irene , Efthymiopoulos Christos
Published: May 2022

We present a closed-form normalization method suitable for the study of the secular dynamics of small bodies inside the trajectory of Jupiter. The method is based on a convenient use of a book-keeping parameter introduced not only in the Lie series organization but also in the Poisson bracket structure employed in all perturbative steps. In particular, we show how the above scheme leads to a redefinition of the remainder of the normal form at every step of the formal solution of the homological equation. An application is given for the semi-analytical representation of the orbits of main belt asteroids.
Satellites’ orbital stability through normal forms
Authors: De Blasi Irene , Celletti Alessandra , Efthymiopoulos Christos
Published: May 2022

A powerful tool to investigate the stability of the orbits of natural and artificial bodies is represented by perturbation theory, which allows one to provide normal form estimates for nearly-integrable problems in Celestial Mechanics. In particular, we consider the orbital stability of point-mass satellites moving around the Earth. On the basis of the J2 model, we investigate the stability of the semimajor axis. Using a secular Hamiltonian model including also lunisolar perturbations, the so-called geolunisolar model, we study the stability of the other orbital elements, namely the eccentricity and the inclination. We finally discuss the applicability of Nekhoroshev’s theorem on the exponential stability of the action variables. To this end, we investigate the non-degeneracy properties of the J2 and geolunisolar models. We obtain that the J2 model satisfies a “three-jet” non-degeneracy condition, while the geolunisolar model is quasi-convex non-degenerate.
New results on orbital resonances
Authors: Malhotra Renu
Published: May 2022

Perturbative analyses of planetary resonances commonly predict singularities and/or divergences of resonance widths at very low and very high eccentricities. We have recently re-examined the nature of these divergences using non-perturbative numerical analyses, making use of Poincaré sections but from a different perspective relative to previous implementations of this method. This perspective reveals fine structure of resonances which otherwise remains hidden in conventional approaches, including analytical, semi-analytical and numerical-averaging approaches based on the critical resonant angle. At low eccentricity, first order resonances do not have diverging widths but have two asymmetric branches leading away from the nominal resonance location. A sequence of structures called “low-eccentricity resonant bridges” connecting neighboring resonances is revealed. At planet-grazing eccentricity, the true resonance width is non-divergent. At higher eccentricities, the new results reveal hitherto unknown resonant structures and show that these parameter regions have a loss of some – though not necessarily entire – resonance libration zones to chaos. The chaos at high eccentricities was previously attributed to the overlap of neighboring resonances. The new results reveal the additional role of bifurcations and co-existence of phase-shifted resonance zones at higher eccentricities. By employing a geometric point of view, we relate the high eccentricity phase space structures and their transitions to the shapes of resonant orbits in the rotating frame. We outline some directions for future research to advance understanding of the dynamics of mean motion resonances.
The Lidov-Kozai resonance at different scales
Authors: Libert Anne-Sophie
Published: May 2022

The Lidov-Kozai (LK) resonance is one of the most widely discussed topics since the discovery of exoplanets in eccentric orbits. It constitutes a secular protection mechanism for systems with high mutual inclinations, although large variations in eccentricity and inclination are observed. This review aims to illustrate how the LK resonance influences the dynamics of the three-body problem at different scales, namely i) for two-planet extrasolar systems where the orbital variations occur in a coherent way such that the system remains stable, ii) for inclined planets in protoplanetary discs where the LK cycles are produced by the gravitational force exerted by the disc on the planet, iii) for migrating planets in binary star systems, whose dynamical evolution is strongly affected by the LK resonance even without experiencing a resonance capture, and iv) for triple-star systems for which the migration through LK cycles combined with tidal friction is a possible explanation for the short-period pile-up observed in the distribution of multiple stars.
Noise, friction and the radial-orbit instability in anisotropic stellar systems: stochastic N–body simulations
Authors: Di Cintio Pierfrancesco , Casetti Lapo
Published: May 2022

By means of numerical simulations we study the radial-orbit instability in anisotropic self-gravitating N–body systems under the effect of noise. We find that the presence of additive or multiplicative noise has a different effect on the onset of the instability, depending on the initial value of the orbital anisotropy.
Weak stability transition region near the orbit of the Moon
Authors: Makó Zoltán , Salamon Júlia
Published: May 2022

This paper provides a study on the weak stability transition region in the framework of the planar elliptic restricted three-body problem. We define the lower boundary curve of the weak stability transition region and as a particular case, we determine this curve in the Sun-Earth system. The orbit of the Moon is near the lower boundary of the weak stability transition region.