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Large-amplitude periodic solutions to the steady Euler equations with piecewise constant vorticity
Get PDFWe consider steady solutions to the incompressible Euler equations in a two-dimensional channel with rigid walls. The flow consists of two periodic layers of constant vorticity separated by an unknown interface. Using global bifurcation theory, we rigorously construct curves of solutions that terminate either with stagnation on the interface or when the conformal equivalence between one of the layers and a strip breaks down in a (Formula presented.) sense. We give numerical evidence that, depending on parameters, these occur either as a corner forming on the interface or as one of the layers developing regions of arbitrarily thin width. Our proof relies on a novel formulation of the problem as an elliptic system for the velocity components in each layer, conformal mappings for each layer, and a horizontal distortion, which makes these mappings agree on the interface. This appears to be the first local formulation for a multi-layer problem, which allows for both overhanging wave profiles and stagnation points.</p
Inelastic behaviour and algebraic characterisation of long cylindrical shells under combined compression and bending
Get PDFLong thin-walled cylindrical metallic shells, widely used in civil engineering infrastructures such as wind turbine towers and pipelines, exhibit complex structural behaviour under combined compression and bending. This complexity arises from interactions between geometric and material nonlinearities, particularly cross-sectional ovalisation under bending. Current design standards, including Eurocode 3 Part 1-6, lack comprehensive guidance for such loading scenarios. As part of the ongoing development of Eurocode 3 Part 1-6, this study investigates the inelastic performance of long cylindrical shells under combined bending and compression through a detailed finite element modelling program. A wide range of geometric parameters, including radius-to-thickness ratios, lengths, and load eccentricities were analysed to assess the influence of nonlinearities on structural response. Based on the modelled results, algebraic calculation methods are proposed to complement existing design rules, offering more accurate predictions for the buckling and ultimate strength of cylindrical shells under combined compression and bending
Coordination Chemistry Approaches for New Synthetic Scaffolds Towards the Assembly of Biosensing Tools
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A scoping review of followership literature in compulsory schooling contexts
Get PDFThis scoping review examines 61 peer-reviewed studies (1984–2024) on followership in compulsory schooling to map existing research and highlight future research areas. Findings show a predominance of quantitative studies, with limited attention to relational and co-constructive frameworks. Middle leadership and cross-cultural contexts are underrepresented. The review highlights a lack of focus on building followership capacity and its impact on school culture. While followership is acknowledged as critical to organizational success, its reciprocal role with leadership remains underexplored. The review calls for diverse methodologies and greater attention to sociocultural factors to inform more collaborative and sustainable leadership practices in schools.</p
AI governance under the second Trump administration:implications for labour
Get PDFThis commentary examines the emerging body of rules, policies and practices governing the development, adoption and use of artificial intelligence (AI) technologies in the United States, and its implications for work and workers. At the federal level, the United States has so far pursued a strategy based on export controls and a relatively permissive regulatory environment with a patchwork of measures to promote responsible AI innovation and use. As the second Trump administration now begins to implement plans to entirely overhaul frameworks adopted under President Biden, however, the situation is more volatile. Major initiatives designed to hold employers accountable and prevent harms to workers, including Biden’s flagship Executive Order, are no longer in place. While some progress can be observed at the state level, many proposals for legislation to strengthen workers’ rights in relation to AI have stalled. A conservative majority in the Supreme Court meanwhile lays the ground for further rulings that could undermine the power of organised labour. Despite these enormous challenges, workers are increasingly regarding AI adoption and use as a site of collective struggle. Alongside jurisdiction case reports on China, Canada, Brazil, India and the EU, the following discussion of the US’s AI regulation, development and governance approaches today is part of the Artificial Intelligence Policy Observatory for the World of Work (AIPOWW) symposium
An Investigation into the Implementation of Distributed Leadership in University Quality Management: The Case of a Sino-Foreign Cooperative University in China
No full textEnhanching Assessment as Learning:The Influence of Language Assessment Literacy on Indonesian EFL Students’ Writing
Get PDFThis study examines the impact of enhancing Language Assessment Literacy (LAL) on Indonesian EFL students’ writing development through Assessment as Learning (AaL) practices. Unlike most research that emphasizes teacher-focused LAL, this study shifts attention to learners, exploring how assessment knowledge, particularly through rubrics, can promote metacognitive awareness, autonomy, and improved writing outcomes. A mixed-methods design was employed with 84 senior high school students randomly assigned to experimental and control groups. Results showed no significant differences between groups prior to the intervention. However, post-test scores indicated a significant advantage for the experimental group (M = 16.69) compared to the control group (M = 8.91), with a large effect size (η² = .82), confirming the effectiveness of LAL-based pedagogy. Qualitative interview data revealed that students’ attitudes toward LAL strongly shaped its classroom integration. Although learners initially reported limited experience, low confidence, and concerns about the reliability of peer assessment, they ultimately expressed positive perceptions of LAL, highlighting its role in clarifying writing expectations, supporting reflection, and fostering learner autonomy. These findings suggest that embedding LAL in EFL writing instruction can transform assessment into a learner-centered process that enhances both writing performance and self-regulated learning. Pedagogically, the study underscores the importance of scaffolding and supportive implementation of student-centered assessment practices. However, the study is limited by its short intervention period and context-specific sample. Future research should adopt longitudinal designs, involve diverse contexts, and explore digital tools to support sustainable LAL integration
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