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We investigate theoretically the steady incompressible viscoelastic flow in a rigid axisymmetric cylindrical pipe with varying cross-section. We use the Oldroyd-B viscoelastic constitutive equation to model the fluid viscoelasticity. First, we derive exact general formulae: for the total average pressure-drop as a function of the wall shear rate and the viscoelastic axial normal extra-stress; for the viscoelastic extra-stress tensor and the Trouton ratio as functions of the fluid velocity on the axis of symmetry; and for the viscoelastic extra-stress tensor along the wall in terms of the shear rate at the wall. Then we exploit the classic lubrication approximation, valid for small values of the square of the aspect ratio of the pipe, to simplify the original governing equations. The final equations are solved analytically using a regular perturbation scheme in terms of the Deborah number, De, up to eighth order in De. For a hyperbolically shaped pipe, we reveal that the reduced pressure-drop and the Trouton ratio can be recast in terms of a modified Deborah number, Dem, and the polymer viscosity ratio, η, only. Furthermore, we enhance the convergence and accuracy of the eighth-order solutions by deriving transformed analytical formulae using Padé diagonal approximants. The results show the decrease of the pressure drop and the enhancement of the Trouton ratio with increasing Dem and/or increasing η. Comparison of the transformed solutions with numerical simulations of the lubrication equations using pseudospectral methods shows excellent agreement between the results, even for high values of Dem and all values of η, revealing the robustness, validity and efficiency of the theoretical methods and techniques developed in this work. Last, it is shown that the exact solution for the Trouton ratio gives a well-defined and finite solution for any value of Dem and reveals the reason for the failure of the corresponding high-order perturbation series for Dem > 1/2.
Turbulent entrainment at the turbulent/non-turbulent interface (TNTI) plays an important role in understanding the turbulent diffusion. While entrainment in fully developed canonical turbulent flows has been extensively studied, the evolution of entrainment in spatially developing flows remains poorly understood. In this work, characteristics of entrainment and the effect of vortices on entrainment of the shear layer separated from a wall-mounted fence are studied by the experiment in a water channel. The shedding vortex experiences a series of stages, including generation, growth, deformation and breakdown into smaller vortices. With the development of the flow, entrainment varies correspondingly. The prograde vortex near the TNTI is found to suppress entrainment but have little effect on the detrainment process, while the retrograde vortex promotes entrainment and suppresses detrainment as well. Consequently, the local entrainment velocity is decreased by the prograde vortex and increased more significantly by the retrograde vortex. Along the streamwise direction, the time-mean entrainment velocity is smallest where the prograde vortex is strongest in the vortex deformation stage. However, the largest time-mean entrainment velocity is located where the enstrophy gradient near the TNTI is greatest after reattachment, rather than where the retrograde vortex is strongest shortly after the breakdown of the shedding vortex, because the scarcity of retrograde vortices in the vicinity of the TNTI makes their long-time cumulative contribution not as significant as their local enhancement. The present study reveals how entrainment evolves in the separated and reattaching flow, and improves our understanding of the effect of vortices on entrainment.
This article serves as an introduction to the special issue on ‘Populism and Right-Wing Legal Mobilization in Europe’. We point to the dependence of populists in power on non-state actors: populist governments have ideological and political reasons to need the support of civil society’s right-wing representatives and have the financial and institutional means to strengthen those organizations. We then map right-wing legal mobilization in Europe based on the analyses in the special issue. By right-wing legal mobilization, we understand the organized efforts, resources, and strategies employed by individuals, groups, or organizations with conservative or right-leaning ideologies to embody their values in positive law and its interpretation. The text concludes with a dynamic normative framework to assess this type of mobilization. Drawing on recent contributions from comparative constitutional law, human rights, and socio-legal studies, we argue that the analysis and evaluation of right-wing legal mobilization could be based on a comprehensive analysis of three bundles of issues: (1) the relationship between mobilizing actors and the courts, as well as the local standard of judicial independence, (2) the relation of right-wing argumentation to systemic linkages and historical trajectories of human rights, (3) the redistributive effect (economic and symbolic) and the potential success of such mobilization on the legal capacities of other actors who may have opposing interests. From this perspective, the problematic part of right-wing legal mobilization in the context of populism is, therefore, not its ideological, conservative character but its influence on the rule of law to gain strategic advantage. In the process, the very idea of the rule of law and the related issue of civic agency may be compromised.
Though the Polish rule of law crisis has been on the scholarly agenda since the Law and Justice Party (PiS) took power in 2015, the individual agents of legal disruption within the judiciary have been largely off the radar. This intervention aims to fill this gap. This article analyses the legal mobilisation practices of the Supreme Court (SC) judges appointed by the PiS party in a court-packing manner after 2017. It is argued that this is a specific type of legal mobilisation; because it is conducted from within the legal system by judges, it aims to challenge doctrinal views strategically and to legitimise the status of unlawfully elected judges, which consequently destabilises the legal system. Because the legal tools to solve the conflict appear to have been exhausted, new judges engage in public discourse to convince citizens that they have a right to sit on the bench. In the first part of this paper, I critically analyse this public discourse in order to explain the framing of the rule of law crisis. The analysis of this discourse is drawn from 106 texts produced by new SC judges between 2017 and 2023. It is argued that although the ‘populist’ group of SC judges is internally differentiated and does not exhibit clear ideological linkage with the PiS party, it strategically produces certain legal narratives in which their appointments and judicial practices at the SC conform to the Constitution and to relevant statutes and, as such, are legitimate in legal terms. The new judges’ narratives are based on four populist dichotomies that distinguish them from old judges (legitimacy–lack of legitimacy, autonomy–political dependence, formal rule of law–legal anarchy and accountability–corporatism). In the second part, the article proceeds to analyse selected case law of the Supreme Court to explore whether and how court-packing makes it more responsive to the legal mobilisation of the conservative Christian organisation Ordo Iuris (OI) and helps the governing party maintain its power. It is argued that the judicial mobilisation inside the packed Supreme Court is mostly of a discursive nature, as there is limited evidence that newly appointed judges side ideologically with the government and right-wing organisations in recent case law.
Board of directors (BOD) bring valuable human and relational capital to firms but may act as self-interested agents by design. The purpose of this study is to investigate how the compensation of BOD members in high-technology sectors affects overall firm performance. We tested our specific hypotheses using panel regression methodology on data gathered from the CRSP, Compustat, BoardEx, and ExecuComp databases. Our final sample consisted of 9,127 firm years, and the companies in our sample were all high-tech publicly traded U.S. firms from 1992 to 2019. Our results showed that there is an association between BOD’s pay structure and firm performance (accounting-based return on assets and market-based Tobin’s Q). Our findings demonstrate originality and contribute to the literature since we empirically demonstrate that the level of variable BOD pay has a diminishing effect on return on assets and Tobin’s Q. This study advances our knowledge of executive compensation in the high technology sector.
The respective delivery roles of public and private providers is a key battleground in the ongoing transformation of welfare states. But despite a burgeoning literature on public attitudes to aspects of welfare state activity, delivery has to date received scant attention. This article makes a first step in addressing this knowledge gap. Drawing on original survey data from the United Kingdom, it analyses attitudes towards the delivery of social policies and explores their relationship to other welfare attitudes. We show that views on delivery display less variation than attitudes to welfare generosity and redistribution, that public support for private sector involvement in delivery is limited to certain fields and that there is very little consistent support for outright privatisation. The article thus demonstrates that there is very little congruence between attitudes to ‘welfarism’ and attitudes to ‘statism’.
This study explores the relationship between maternal working hours and a child's emotional well-being using data from the UK Millennium Cohort Study. Child well-being is assessed through self-reported happiness and a well-being index that includes concerns, temperament, bullying, and behaviour. Results show a positive association between maternal employment and child well-being, supported by factor analysis combining child, mother, and teacher reports. The association remains consistent across income levels and is unaffected by commuting time or cohabitation status. These findings highlight the importance of maternal employment and contextual factors in shaping child well-being.
In convergent geometry, the effect of convergence and compression on the Rayleigh–Taylor instability (RTI) and Richtmyer–Meshkov instability (RMI) modifies the growth rate and behaviour of the instabilities. In order to better understand how compression/expansion caused by axial strain rates (i.e. strain rates normal to the interface) change the instability dynamics, axial strain rates are applied to RMI in planar geometry, isolated from the effects of convergence. Potential flow theory for the linear regime shows the growth rate of the instability is modified to include the background velocity difference of the instability's width. Resolved two-dimensional simulations of single-mode RMI showed the potential flow model is accurate whilst the amplitude is small compared with the wavelength. The application of strain rate to an RMI-induced mixing layer was investigated using three-dimensional implicit large eddy simulations (ILES) of the quarter-scale $\theta$-group case by Thornber et al. (Phys. Fluids, vol. 29, 2017, 105107). Whilst the background strain rate contributed to the mixing layer's growth, it was to a smaller extent than expected. The shear production of axial turbulent kinetic energy from the strain rate modified the rate of bulk entrainment, affecting the mixing layer's growth and mixedness, such that the strained simulations no longer attained the same self-similar state. The capability of the buoyancy-drag model by Youngs & Thornber (Physica D, vol. 410, 2020, 132517) to predict the mixing layer width was investigated, using a model calibrated to the unstrained case. New terms were introduced into the buoyancy-drag model, which correspond to the shear production of turbulent kinetic energy.
Understanding sex differences among persons with moderate-to-severe traumatic brain injury (TBI) is critical to addressing the unique needs of both males and females from acute care through to rehabilitation. Epidemiological studies suggest that 7 of every 10 persons with moderate-to-severe TBI are male, with females representing about 30%–33%.
Objective:
To examine the proportion of female and male individuals included in randomized controlled trials (RCTs) of interventions for moderate-to-severe TBI.
Methods:
A systematic review was conducted in line with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines up to and including December 2022 using MEDLINE, PubMed, Scopus, CINAHL, EMBASE and PsycINFO databases. Studies were included if they met the following criteria: (1) human participants with a mean age ≥18 years, (2) ≥50% of the sample had moderate-to-severe TBI and (3) the study design was a RCT. Data extracted included author, year, country, sample size, number of female/male participants and time post-injury.
Results:
595 RCTs met the criteria for inclusion, published between 1978 and 2022, totaling 86,662 participants. The average proportion of female participants was 23.14%, and the percentage increased a small but significant amount over time. There was a significantly lower percentage of female participants in RCTs initiated in the acute phase (≤ 1 month) when compared with RCTs conducted in the chronic phase (≥ 6 months) post-injury (p < 0.001).
Conclusions:
Female participants are underrepresented in RCTs of moderate-to-severe TBI. Addressing this underrepresentation is critical to establish effective treatments for all persons with TBI.
L-carnitine has an important role in the control of oxidative stress and lipid β-oxidation during in vitro culture and cryopreservation of ovarian follicles, oocytes and embryos. This substance balances the acetyl-CoA/CoA ratio, maintains glucose metabolism and increases energy production in mitochondria. It also plays a key role in reducing endoplasmic reticulum stress, by transferring palmitate to mitochondria or eliminating it to avoid toxicity. By eliminating reactive oxygen species, L-carnitine increases the percentages of mature oocytes with uniform mitochondrial distribution and improves embryo post-thaw cryotolerance. Therefore, L-carnitine controls lipid β-oxidation and oxidative stress during in vitro culture of ovarian follicles, oocyte maturation, embryonic development and cryopreservation.
This study examines the changes over time of the twinning rate and infant and child mortality across 17 rural villages in the province of Zaragoza (Spain) over a span of 200 years. The aim is to understand how the twinning rate evolved in conjunction with the processes of economic and social modernization, as well as the demographic transition. During the period analyzed, the twinning rate increased by 10%, rising from 1.26 per 1000 births in the second half of the 18th century to 1.38 per 1000 births in the first half of the 20th century. This rate varied due to hereditary issues, biological factors such as the mother’s age and parity, and socioeconomic features like family occupation and the mother’s education level. In terms of child mortality, twins historically faced a significantly higher mortality rate. However, they benefited greatly from the mortality transition, at least in absolute numbers. While nearly 60% of twins did not survive beyond 5 years of age in earlier periods, the mortality rate for twins decreased to 40% by the first half of the 20th century. The excess mortality was particularly severe for girls, driven by a widespread preference for sons, which led to higher mortality rates for girls in the first 5 years of life, especially in the earliest months. These findings help us understand the improvements in uterine and childhood survival rates for contemporary twins, which can be attributed to the socioeconomic and medical advancements of the 20th century.
Supersonic internal flows often exhibit multiple reflected shocks within a limited distance. These shocks can interact with each other in a complex manner due to the characteristics of the shock wave–turbulent boundary layer interaction (STBLI), including flow distortion and the relaxing boundary layer. This study aims to characterise this type of interaction and to clarify its fluid physics. A separated STBLI zone was established either upstream or downstream, and another weaker STBLI was established in the opposing position to serve as a perturbation. Time-resolved measurements were employed to characterise the mean separation and unsteadiness as the two regions approached each other, as well as their relationship. The experimental results indicated that the STBLI could affect the separation and reattachment of the other STBLI through either the decelerated or relaxing boundary layer. Despite a small deflection angle, the incident shock can amplify the low-frequency oscillations in the downstream STBLI region. Additionally, the interaction in the downstream region can be influenced by both low- and high-frequency oscillations associated with the upstream STBLI through a relaxing boundary layer. Despite the limited correlation observed between the low-frequency fluctuations in the downstream region and the boundary layer flow not far upstream, there still exists some degree of correlation between the low-frequency shock motions even when they are widely separated. Both the ‘upstream mechanism’ and ‘downstream mechanism’ have been observed, and the significance of low-frequency dynamics in the separated flow, relative to that of the upstream flow, is closely associated with interaction intensity.
This article explores the shift in mental health recovery from mere symptom management to a holistic approach via the CHIME framework. It delves into the author’s experience, beginning with the loss of his father, a war veteran with mental health struggles, at 16, thrusting him into the role of primary caregiver for his mother, who also battled mental health issues and eventually took her own life. These events spotlight the shortcomings of traditional mental health care and the urgent need for empathetic, multifaceted services. Advocating for co-creation in mental health services, the article outlines a transition towards a system that integrates recovery principles through stages from co-ideation to co-evaluation, emphasising holistic, person-centred care. It calls for a reimagined mental healthcare system that respects individual journeys and is rooted in co-creation, signalling a critical move towards systemic change.
While I believe that the authors, Emiline Smith and Erin Thompson, have legitimate concerns regarding the theft of cultural objects, I consider that, in the article “A Case Study of Academic Facilitation of the Global Illicit Trade in Cultural Objects: Mary Slusser in Nepal”, International Journal of Cultural Property (2023), 1–20, the authors present a number of serious misrepresentations.
The day has arrived that genetic tests for educational outcomes are available to the public. Today parents and students alike can send off a sample of blood or saliva and receive a ‘genetic report’ for a range of characteristics relevant to education, including intelligence, math ability, reading ability, and educational attainment. DTC availability is compounded by a growing “precision education” initiative, which proposes the application of DNA tests in schools to tailor educational curricula to children’s genomic profiles. Here I argue that these happenings are a strong signal of the geneticization of education; the process by which educational abilities and outcomes come to be examined, understood, explained, and treated as primarily genetic characteristics. I clarify what it means to geneticize education, highlight the nature and limitations of the underlying science, explore both real and potential downstream bioethical implications, and make proposals for mitigating negative impacts.
A 10-year-old child with stabilised idiopathic dilated cardiomyopathy was admitted to the hospital with sudden worsening of heart failure. Further analysis showed increased NT-proBNP and positive for COVID-19. Myocarditis secondary to COVID-19 was assumed. Recurrent hospitalizations with inotropic support were required due to the progressive worsening of cardiac function. Seven months after SARS-CoV-2 myocarditis, she underwent heart transplantation.
This paper investigates the intricate interplay between tax expenditures (TEs) and social policy. Leveraging the Global Tax Expenditures Database (GTED), we carry out the first data-driven comparative assessment of direct spending and TEs for social welfare across countries to shed light on this often-overlooked aspect of fiscal policy. Our research reveals prevalent TE usage for social purposes and substantial costs in terms of revenue forgone worldwide, averaging over 1 per cent of Gross Domestic Product (GDP) and 6 per cent of tax revenue. Our analysis showcases varying strategies employed by countries, particularly emphasizing the reliance of high-income economies on TEs granted through personal income taxes, and low/middle-income countries predominantly using value-added tax-related TEs for social objectives. Our results also highlight the importance of functions such as housing in contributing significantly to social spending through TEs with the ratio tax expenditure/direct spending reaching roughly 365 per cent in the US and 203 per cent in France. Hence, our study underlines the necessity for meticulous evaluation and efficient design of TEs to better align TE regimes with governments social policy objectives as well as to minimise unintended social or economic consequences.
This article examines the complex relationship between Sufism, secularity, and psychiatry through Refik Halid Karay’s 1956 novel, Kadınlar Tekkesi (Women’s Lodge). The article argues that Kadınlar Tekkesi recontextualizes Sufism by medicalizing and pathologizing it through psychiatry and psychopathology. This analysis draws upon discourse analysis and Michel Foucault’s exploration of abnormality and power dynamics. The article contends that this approach diverges from previous anti-Sufi agendas of Turkish novels, which were primarily motivated by religious and moralistic criticisms. The article argues that the application of psychiatric terminology to Sufism suggests a shift in Turkish secularism’s attitude toward Sufism, which transitions from dismissing Sufism as obsolete to engaging with it systematically through scientific study. Informed by modern scientific rationality, this shift signifies a redefined interaction between knowledge and power and the gendered aspects of the medicalization process. The article underscores that interactions between the discourses of secularism, Sufism, and psychopathology suggest a new regime of truth based on secular and scientific thought, while implicitly supported by orthodox Islamic principles.