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Long viewed as an example of effective multilateralism, UN peace operations are facing mounting challenges. Transformations in the landscape of conflict are outpacing their ability to respond. Rising expectations of peacekeeping have led to disenchantment with what they can deliver, while dis- and misinformation tactics undermine the efforts of the UN to make and build peace. As UN peace operations risk becoming another casualty of intensifying international tensions, great power rivalry, and the erosion of the rules and norms that govern international cooperation, we consider the future of UN peace operations. In the debate between a “pragmatic” and an “adaptive” approach to peacekeeping, we argue that a fundamental question is the ability of both alternatives to address three recurring issues that have shaped the effectiveness and legitimacy of peace operations: the mismatch between ambitious mandates and limited resources; the gap between the protection of civilians objective and its implementation in practice; and growing difficulties in honoring the principles of impartiality. We argue that policymakers and researchers should not lose sight of the fact that peacekeeping's legitimacy depends on its adherence to some version of host-state consent and some kind of restriction on when and how force is used. The expectation of civilian populations that the UN stands for protection also means that the UN must continue to safeguard some key norms associated with peacekeeping.
Deep reinforcement learning (DRL) is employed to develop control strategies for drag reduction in direct numerical simulations of turbulent channel flows at high Reynolds numbers. The DRL agent uses near-wall streamwise velocity fluctuations as input to modulate wall blowing and suction velocities. These DRL-based strategies achieve significant drag reduction, with maximum rates $35.6\,\%$ at $Re_{\tau }\thickapprox 180$, $30.4\,\%$ at $Re_{\tau }\thickapprox 550$, and $27.7\,\%$ at $Re_{\tau }\thickapprox 1000$, outperforming traditional opposition control methods. An expanded range of wall actions further enhances drag reduction, although effectiveness decreases at higher Reynolds numbers. The DRL models elevate the virtual wall through blowing and suction, aiding in drag reduction. However, at higher Reynolds numbers, the amplitude modulation of large-scale structures significantly increases the residual Reynolds stress on the virtual wall, diminishing the drag reduction. Analysis of budget equations provides a systematic understanding of the underlying drag reduction dynamics. The DRL models reduce skin friction by inhibiting the redistribution of wall-normal turbulent kinetic energy. This further suppresses the wall-normal velocity fluctuations, reducing the production of Reynolds stress, thereby decreasing skin friction. This study showcases the successful application of DRL in turbulence control at high Reynolds numbers, and elucidates the nonlinear control mechanisms underlying the observed drag reduction.
The techniques employed to collect and store trematodes vary between research groups, and although these differences are sometimes necessitated by distinctions in the hosts examined, they are more commonly an artefact of instruction. As a general rule, we tend to follow what we were taught rather than explore new techniques. A major reason for this is that there are few technique papers in the published literature. Inspired by a collaborative workshop at the Trematodes 2024 symposium, we outline our techniques and processes for collecting adult trematodes from fishes and discuss the improvements we have made over 40 years of dissections of 20,000+ individual marine fishes. We present these techniques for two reasons: first, to encourage unified methods across the globe, with an aim to produce optimally comparable specimens across temporal periods, across geographic localities, and between research groups; and second, as a resource for inexperienced researchers. We stress the importance of understanding differences in host biology and the expected trematode fauna, which ultimately enables organised and productive dissections. We outline our dissection method for each key organ separately, discuss handling, fixation, and storage methods to generate the most uniform and comparable samples, and explore ethical considerations, issues of accurate host identification, and the importance and potential of clear record keeping.
There has been limited consideration of the training and support needs of therapists from minoritised ethnic backgrounds. This study quantitatively evaluates a novel application of self-practice/self-reflection (SP/SR) to CBT therapists from minoritised ethnic backgrounds. The study aimed to explore the impact of the SP/SR programme on (1) therapists’ skills in working with ethnicity in their clinical practice; (2) their ethnic identity development; and (3) their perceived levels of personal and professional wellbeing, during the intervention and at follow-up. A multiple baseline single case experimental design was adopted. Measures were developed and adapted for this evaluation and weekly outcomes relating to therapist skill development, ethnic identity development, and personal and professional wellbeing were collected. The outcomes of six participants were analysed using visual and statistical analysis. The results indicated that the SP/SR programme significantly improved therapist skills in identifying and addressing similarities and differences in ethnicity within therapy during the intervention. Improvements were also seen across other skills, ethnic identity developmental and wellbeing outcomes between the baseline and SP/SR phases, with some participants showing significant improvements. Outcomes from the follow-up phase presented a more mixed picture. Therefore, the findings give some support for the SP/SR programme in developing therapist skills in working with ethnicity, as well as highlighting differential outcomes for participants related to their levels of experience and engagement. The findings may have possible implications for the personal and professional development of ethnically minoritised therapists, as well as future quantitative SP/SR research.
Key learning aims
(1) To provide an overview of self-practice/self-reflection (SP/SR) and its theoretical underpinnings.
(2) To summarise the current issues around the development of cultural competence, particularly for therapists from minoritised ethnic backgrounds.
(3) To introduce and describe a novel SP/SR programme for CBT therapists from minoritised ethnic backgrounds.
(4) To highlight the importance of considering ethnicity within clinical practice, both in terms of the provision of culturally competent therapy as well as to support the personal and professional development of therapists from minoritised ethnic backgrounds.
We study the effect of turbulence on collisions between a finite-size bubble and small inertial particles based on interface-resolved simulations. Our results show that the interaction with the flow field around the bubble remains the dominant effect. Nonlinear dependencies in this process can enhance the turbulent collision rate by up to 100 % compared to quiescent flow. Fluctuations in the bubble slip velocity during the interaction with the particle additionally increase the collision rate. We present a frozen-turbulence model that captures the relevant effects providing a physically consistent framework to model collisions of small inertial particles with finite-sized objects in turbulence.
Women political leaders, research shows, have been able to use stereotypically feminine traits to their advantage in their response to the pandemic, thus overcoming usual double binds of performing femininity and political leadership. But what, more precisely, accounts for women politicians’ successful performance of pandemic leadership? In this paper, we argue that public perceptions of women leaders’ credibility are negotiated through news media and further mediated by specific events and broader cultural contexts. Using a mixed methodology of media readings and focus group interviews, we show how prime ministers Erna Solberg of Norway and Mette Frederiksen of Denmark both performed a persona of the “mother of the nation,” but only Solberg succeeded in doing so authentically, leading to the public’s celebration of her credibility while Frederiksen was chided for being inauthentic and strategic.
Informal social protection systems (ISPs) continue to play a significant role where government-sanctioned social security measures do not reach vulnerable populations. Despite their essence and utility, they remain marginalised in social policy, theory, and practice, and thus many call for their integration. However, research has often overlooked factors embedded in the integration process particularly how these can affect the future performance of ISPs if they are to interact with formal systems. Adopting an argumentative conceptual approach, and a synthesis of social policy literature on ISPs, we provide a framework for managing relationships with actors to optimise the interaction between ISPs and formal social welfare systems through a conceptual framework that utilises design thinking and community development principles. We outline three essential conditions for effective engagement with ISPs to achieve social impact, urging government and others to engage with empathy; treat communities as equal collaborators; and keep a social justice focus.
As Black Lives Matter protests swept across the United States in recent years, protesters encountered a mix of police reactions: Some news reports described police in military gear and widespread arrests, whereas others reported minimal police involvement. We developed an original dataset of BLM protests that shows that police reactions varied widely, even when comparing protests with similar messages and tactics. We then investigated this variation with a survey experiment and found that observers are more likely to describe protesters as violent when a protest is met with a heavy police presence. These findings highlight the role of the police in shaping public perceptions of violence and social movements and extend a growing body of empirical research on BLM by shifting the focus from protest activity to the impact of protest policing.