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Wavy topography can exert a significant influence on gravity-driven flows in porous media. Building on the low-dimensional theoretical framework for a wavy topography of height $f(x) = A[1 - \cos (\lambda x)]$, where $A$ is the amplitude and $\lambda$ is the wavenumber of the topography, under small-slope conditions ($A\lambda \ll 1$) Di et al. (2025 J. Fluid Mech., vol. 1016, A16), we extend the framework to constant-flux injection while incorporating uniform drainage and localised leakage through low-permeability substrates. A key dimensionless topographic intensity, emerges as the ratio of the pressure gradient required to overcome topographic slopes to the characteristic viscous gradient driving the flow, thereby quantifying topographic resistance. Our results show that a larger topographic intensity retards current advancement, while drainage, governed by the drainage intensity, imposes an upper bound on propagation distance. Leakage proves highly sensitive to the along-slope position of fissured zones. Comparisons with a macroscopic sharp-interface flow model indicate that the low-dimensional model simplifies the two-phase dynamics in substrates via a Darcy’s sink term, yielding underestimates of propagation during drainage and leakage. Applied to the field of carbon dioxide sequestration, our low-dimensional model reveals how injection flux modulates the early-stage flow dynamics over wavy cap rocks, offering theoretical insights into sequestration performance.
This article traces the union career of Abdoulaye Diallo, born in French West Africa in 1917, from the united World Federation of Trade Unions’ (WFTU) 1947 Pan-African Trade Union Conference in Dakar to the founding of the Union Générale des Travailleurs d’Afrique Noire (UGTAN) in 1957. The Dakar conference was a turning point: African delegates, including Diallo, compelled the WFTU to address colonial labour exploitation, thereby unsettling representatives of empire. Following the 1949 split, the WFTU increasingly amplified and promoted leaders from Africa, Asia, and Latin America, and Diallo was appointed vice-president. Our analysis of Diallo’s publications reveals his fierce anti-colonialism and anti-imperialism. It also shows how, following the split, the WFTU provided a platform for Africans to express their anti-colonial views to a wider audience through newspapers and WFTU publications. His interventions at meetings of the UN’s Economic and Social Council (ECOSOC) in the early 1950s exposed forced labour and repression to representatives of international organizations while offering unwavering, uncritical support for the Soviet Union. At the WFTU’s Third World Congress in Vienna (1953), Diallo stood out as the leading African delegate, urging workers to organize for liberation. Regionally, he mobilized Francophone West African workers against wage discrimination and colonial coercion, navigating tensions between communist internationalism and emerging nationalist priorities. This study reimagines the WFTU as an anti-colonial arena, shaped by African agency during the early Cold War period.
Current research conceptualizes the gender performance of populist leaders in terms of toxic hypermasculinity expressed through their sexist, misogynist, and transphobic rhetoric. This article challenges and complicates this perspective. As hegemonic masculinities, which formerly gained their power through their invisibility, are increasingly contested, they engage in a strategic hybridization by borrowing aesthetic elements from marginalized identities. In contrast to the established hypermasculinity thesis, we contend that right-wing populists, exemplified by Donald Trump, incorporate queer elements in their embodied gender performances. Trump’s masculinity appropriates the subversive spirit of queerness. It conveys reactionary content through rebellious aesthetics, which results in fake subversion. By drawing together insights from populist research with masculinities studies and queer theory, the article makes sense of (1) why Trump employs queer aesthetics, (2) why his followers appreciate his queer performance, (3) why the queer dimension of his masculinity goes unnoticed, and (4) what new light the case of Trump’s queerness sheds on the concept of hybrid masculinities.
A ${\mathcal Z}$-subalgebra $U_{\mathcal Z}^\jmath {(n)}$ (${\mathcal Z}=\mathbb Z[\upsilon ,\upsilon ^{-1}]$) for the i-quantum group ${\mathbf {U}}^{\jmath }(n)$ over the field $\mathbb Q(\upsilon )$ is constructed by two of the authors [‘A new realisation of the i-quantum group $U^\jmath {(n)}$’, J. Pure Appl. Algebra226(1) (2022), Paper no. 106793, 27 pages, Theorem 6.5], using a Beilinson–Lusztig–MacPherson (BLM) type realisation. In this paper, we construct bases for $U_{\mathcal Z}^\jmath {(n)}$, including the monomial basis conjectured in [‘A new realisation of the i-quantum group $U^\jmath {(n)}$’, J. Pure Appl. Algebra226(1) (2022), Paper no. 106793, 27 pages, Remark 6.6(4)]. This proves that the ${\mathcal Z}$-algebra $U_{\mathcal Z}^\jmath {(n)}$ is a free ${\mathcal Z}$-module. Hence, $U_{\mathcal Z}^\jmath {(n)}$ is in fact an integral form of Lusztig type. This construction is further extended to the i-quantum hyperalgebra over a field of any characteristic. By specialising $\upsilon $ to an l th primitive root $\varepsilon $ of $1$ with l odd, a realisation of the quotient of modulo the ideal generated by $d_i^l-1$, for all $1\leqslant i\leqslant n+1$, is also given as a by-product.
In this work, we will present evidence for the incompatibility of smoothed particle hydrodynamics (SPH) methods and eddy viscosity models. Taking a coarse-graining perspective, we physically argue that SPH methods operate intrinsically as Lagrangian large eddy simulations for turbulent flows with strongly overlapping discretisation elements. However, these overlapping elements in combination with numerical errors cause a significant amount of implicit subfilter stresses (SFS). Considering a Taylor–Green flow at $Re=10^4$, the SFS will be shown to be relevant where turbulent fluctuations are created, explaining why turbulent flows are challenging even for current SPH methods. Although one might hope to mitigate the implicit SFS using eddy viscosity models, we show a degradation of the turbulent transition process, which is rooted in the non-locality of these methods.
Flame–wall interaction (FWI) of lean premixed hydrogen/air flames is critical in wall-bounded combustors, where thermodiffusive instabilities strongly influence quenching. To capture these effects efficiently in realistic configurations, reduced-order combustion models such as flamelet tabulation are desirable, as they lower resolution requirements and computational cost. In this study, advanced flamelet manifolds incorporating a mixture-averaged species diffusion model and thermal diffusion are developed to represent the FWI of thermodiffusively unstable lean hydrogen/air flames. A central challenge is the simultaneous capture of intrinsic instabilities and heat losses, each complex in itself. Separate manifolds addressing these effects are first introduced, providing the foundation for joint manifolds that capture both simultaneously. In this context, the choice of flamelet databases is examined by comparing freely propagating flames with exhaust gas recirculation, commonly used in flamelet modelling to represent enthalpy variations, with one-dimensional head-on quenching (HOQ) flames, which are essential for accurate prediction of wall heat flux and pollutant formation in hydrocarbon flames. The models are evaluated through both a-priori and a-posteriori analyses across increasingly complex configurations, culminating in the HOQ of a thermodiffusively unstable flame, where both instability and quenching must be captured simultaneously. Results show excellent agreement with reference simulations using detailed chemistry, accurately reproducing key features of the flame front, thermochemical state and global flame properties such as consumption speed and quenching wall heat flux. This marks a key advance in modelling hydrogen combustion and provides a robust foundation for studying safety-critical phenomena such as flame flashback linked to near-wall flame propagation.
For every natural number n we introduce a new weak choice principle $\mathrm {nRC_{fin}}$:
Given any infinite set x, there is an infinite subset$y\subseteq x$and a selection function f that chooses an n-element subset from every finite$z\subseteq y$containing at least n elements.
By constructing new permutation models built on a set of atoms obtained as Fraïssé limits, we will study the relation of $\mathrm {nRC_{fin}}$ to the weak choice principles $\mathrm {RC_m}$ (that has already been studied in [3] and [6]):
Given any infinite set x, there is an infinite subset$y\subseteq x$with a choice function f on the family of all m-element subsets of y.
Moreover, we prove a stronger analogue of the results in [6] when we study the relation between $\mathrm {nRC_{fin}}$ and $\mathrm {kC_{fin}^-}$ which is defined by
Given any infinite family$\mathcal {F}$of finite sets of cardinality greater than k, there is an infinite subfamily$\mathcal {A}\subseteq \mathcal {F}$with a selection function f that chooses a k-element subset from each$A\in \mathcal {A}$.
This article rethinks how colonial presence and foreign settlements reconfigured urban spaces beyond the treaty-port system by examining Chengdu, an inland, non-treaty-port city. Focusing on the 1930 boundary-wall controversy at West China Union University, a missionary college, it shows that anti-imperialism was refracted through local expectations of access to space and how everyday spatial practices had blurred the line between foreign enclave and local community. In the absence of colonial infrastructures, WCUU pursued indigenizing strategies to embed themselves in urban life; its later move to enclose the campus with walls was criticized as imperialist encroachment. Occurring amid heightened nationalism, the controversy drew force both from nationalist idioms and from ordinary residents’ everyday grievances—economic strain, insecurity, and disruptions to daily routines—in a notably turbulent interwar Chengdu. The conflict brought to the fore two visions of Chengdu’s urban identity: one championed by Western-educated local elites and another articulated by local people defending what they understood as public space. Moreover, I demonstrate how missionary institutions in less overtly colonial settings grappled with the contradictions inherent in their liminal status—simultaneously functioning as colonial enclaves and aspiring to integrate into local society.
We explore international reserve accumulation in Emerging Market Economies (EMEs), rationalizing policymakers’ belief that it counteracts the negative effects of capital inflows. Empirical evidence reveals that EMEs accumulate reserves in response to capital inflows driven by global push factors, especially when there are limitations on residents’ investments abroad. We elucidate these findings with a three-period model of a small open economy. In the first period, a large direct investment inflow occurs, prompting an EME to save abroad for consumption smoothing. If frictions hinder private overseas investments, the government can accumulate reserves to supplement insufficient private outflows. The theory highlights the role of reserves in managing capital inflows, as substantiated by our empirical findings.
This article revisits the linguistic periodization of the book of Jonah, focusing on E.B. Pusey’s 1860 commentary and its modern relevance. Pusey challenged claims that Jonah’s unusual lexicon and grammar required a post-exilic date, arguing instead for earlier, non-diachronic explanations such as dialect, foreign influence, and contextual usage. His nuanced treatment anticipated later methodological developments, especially the rule-governed approach of Avi Hurvitz, which identifies diagnostically late linguistic features through late distribution, classical opposition, and extrabiblical confirmation. Applying these criteria, the article surveys more than fifty features in Jonah deemed late by various scholars. Eleven emerge as strong indicators of lateness, while many others show partial or ambiguous significance, often explainable by genre, style-switching, or Phoenician/Aramaic influence. Taken cumulatively, the evidence suggests Jonah’s Hebrew belongs to a late stratum, most plausibly the sixth–fifth century BCE, within the Persian Period, though affinities with Rabbinic Hebrew complicate precise placement. While modern scholarship generally rejects Pusey’s pre-exilic dating, his sensitivity to methodological caution and non-diachronic variety remains instructive. Jonah thus stands as a linguistically peculiar text, chiefly Classical Biblical Hebrew, but with links to Late Biblical Hebrew, Rabbinic Hebrew, and Aramaic, that offers a valuable test case for theories of linguistic periodization.
This essay proposes that the relationship between synodality and sacramental participation runs deep – so deep that one cannot be understood apart from the other. This is to say that there is no synodality apart from an understanding of synodality’s sacramental foundations and its own sacramental character and that the economy of sacramental grace cannot be fully realized by and within the ecclesial community without its fuller integration of synodal journeying together.
Transcatheter completion of the extracardiac Fontan provides a minimally invasive option for selected children with single-ventricle physiology who have undergone staged preparation at the time of the bidirectional cavopulmonary connection.
Methods:
We performed a retrospective single-centre review of consecutive patients treated between 2022 and 2025. Candidate selection, cross-sectional imaging, diagnostic catheterisation, procedural steps, early recovery, and follow-up outcomes were collected.
Results:
Five patients underwent transcatheter completion at a median age of 7 years (range 4–17). The interval between the preparatory operation and catheter procedure was 7 months (range 6–9). Median procedure time was 140 minutes (range 120–180). The ICU stay was 2 days (range 1–3), and the total hospital stay was 5 days (range 4–6). Minimal pleural effusions occurred in four patients, none requiring drainage. At a median follow-up of 28 months (range 4–36), all patients were clinically stable; resting oxygen saturation was 96% (range 94% to 97%). One late-presenting patient had biochemical evidence consistent with protein-losing enteropathy but remained asymptomatic without targeted therapy. No thromboembolic events occurred.
Conclusions:
In a programme that couples surgical preparation with later catheter-based completion, the extracardiac Fontan can be performed safely and effectively in carefully selected candidates, with rapid recovery and stable mid-term clinical status. Larger studies are needed to define long-term outcomes and comparative effectiveness versus surgical completion.
We study complete noncompact spacelike mean curvature flow solitons (SMCFS) in a standard static spacetime obeying a suitable constraint on the sectional curvature. In this context, we prove a version of the Omori–Yau generalized maximum principle and apply it to deduce that such an SMCFS must be maximal in the sense that its mean curvature vanishes identically. Next, we use other maximum principles which deal with the notions of convergence to zero at infinity and polynomial volume growth to prove rigidity results for SMCFS. Furthermore, we apply our previous results to establish nonexistence results concerning entire Killing graphs constructed over the Riemannian base of a standard static spacetime. Finally, we also exhibit an example showing the relevance of key hypotheses in our results.
Reconstructing near-wall turbulence from wall-based measurements is a critical yet inherently ill-posed problem in wall-bounded flows, where limited sensing and spatially heterogeneous flow–wall coupling challenge deterministic estimation strategies. To address this, we introduce a novel generative modelling framework based on conditional flow matching for synthesising instantaneous velocity fluctuation fields from wall observations, with explicit quantification of predictive uncertainty. Our method integrates continuous-time flow matching with a probabilistic forward operator trained using stochastic weight-averaging Gaussian, enabling zero-shot conditional generation without model re-training. We demonstrate that the proposed approach not only recovers physically realistic, statistically consistent turbulence structures across the near-wall region but also effectively adapts to various sensor configurations, including sparse, incomplete and low-resolution wall measurements. The model achieves robust uncertainty-aware reconstruction, preserving flow intermittency and structure even under significantly degraded observability. Compared with classical linear stochastic estimation and deterministic convolutional neural network methods, our stochastic generative learning framework exhibits superior generalisation for unseen realisations under same flow conditions and resilience under measurement sparsity with quantified uncertainty. This work establishes a robust semi-supervised generative modelling paradigm for data-consistent flow reconstruction and lays the foundation for uncertainty-aware, sensor-driven modelling of wall-bounded turbulence.
In this article, I study non-material harm in cases of environmental liability. Environmental tragedy does not only come at great economic cost but often also brings about non-material loss – that is, loss that has no market value. In order to better recognize, assess, and measure this type of harm, more insight is needed into its psychological conception and parameters. Departing from the available legal frameworks on non-material harm in Belgium as well as in the Netherlands, I study how environmental psychology can help in recognizing, assessing, and measuring environmental non-material harm. More specifically, I focus on solastalgia, a notion that describes the psychological impact of negatively perceived changes to a familiar environment. Solastalgia describes a crisis of identity as a result of a disturbance in the way in which humans inhabit their environment. It describes a form of ecological grief over the loss of a familiar place – that is, the aggregate meanings, values, familiarity, and predictability attached to a specific environment. Using the available theoretical framework around solastalgia and the available empirical insights in the solastalgia literature, I show that solastalgia qualifies as a valid type of harm and bears significant advantages when implemented in environmental tort law frameworks.
This article examines the historical transformation of childhood vaccination in the Netherlands between 1872 and 1959. It analyses how vaccination was reframed from an individual parental responsibility to a collective practice through the establishment of the ‘Rijksvaccinatieprogramma’ (National Immunisation Programme). I analyse this historical trajectory as a case of ‘public health atomism’, a strategy that achieves collective health by prioritizing individual health outcomes and local action. Rather than relying on top-down state mandates, the ‘Rijksvaccinatieprogramma’ was a consequence of co-operation between general practitioners, municipal health officials, civil society organisations, and volunteers. Drawing from published medical sources, parliamentary records, and material from local and national archives, this article provides a detailed historical account of how local governance and autonomy shaped vaccination practices, highlighting the role of the ‘entgemeenschap’ (vaccination community) as a key organisational model for situated collaboration. As such, it revisits childhood vaccination as an archetypical example of biopolitical state intervention, demonstrating how localised, flexible co-operation was instrumental in integrating vaccination into Dutch society.
This article explores how memories of Muslim-Tibetan alliances predating Communist rule still shape social dynamics in Amdo. Based on ethnographic fieldwork in Northwest China, it analyzes narratives about relationships between Muslim Xidaotang merchants and Tibetan religious or secular institutions. These accounts reinterpret the past to make sense of present relationships, reshaping the meaning of historical interactions. The paper examines the emblematic case of the offering of a large cauldron to a Tibetan monastery – an act of alliance rooted in local conflict-resolution practices. This tradition of gift-giving is traced within a broader inter-institutional economy sustained by reciprocal hospitality and protection. The Tibetan designation of Xidaotang merchants as Chösoma (“new religion/teachings”) highlights the role of ethical reputation and technical skill in building trust. The paper concludes by examining the evolution of Xidaotang’s Tian Xing Long commercial label amid China’s ongoing economic reforms. The narratives reveal a trading culture grounded in moral valuation, shared responsibilities, and economic collaboration.
To review the historical, conceptual, and ethical foundations of intelligence testing in neuropsychology and to consider whether alternative cognitive performance labels offer greater conceptual precision while reducing stigma.
Method:
We conducted a narrative review of early twentieth century cognitive assessments, tracing the evolution of intelligence testing and its intersections with eugenic ideology. Key examples include the Army Alpha and Beta tests administered during World War I and Ellis Island immigration assessments, which were frequently interpreted without consideration of cultural or educational influences. We examine how these practices informed early interpretations of neuropsychological performance, particularly in individuals with epilepsy, and shaped initial characterizations of neurologically based cognitive abilities.
Results:
Early intelligence testing was grounded in the belief that intelligence was a fixed and directly genetically determined trait. Test performance was interpreted as an index of biological superiority, lending scientific legitimacy to eugenic ideologies and reinforcing stigma toward individuals with epilepsy. Although modern frameworks emphasize multidimensional cognitive abilities, intelligence-based characterization persists and continues to be frequently reported as a primary outcome of neuropsychological testing.
Conclusions:
In contexts that require a single summary indicator of cognitive performance, labels such as Total Cognitive Composite are recommended since they avoid implying a fixed or unitary capacity. Continued reliance on the construct of “intelligence” is inconsistent with contemporary models of cognition, reflects outdated theoretical assumptions, and carries enduring psychosocial stigma. Moreover, its circular and internally inconsistent definitions substantially limit its validity and appropriateness within contemporary adult clinical neuropsychological practice.