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Ventilated cavities in the wake of a two-dimensional bluff body are studied experimentally via time-resolved X-ray densitometry. With a systematic variation of flow velocity and gas injection rate, expressed as Froude number ($\textit{Fr}$) and ventilation coefficient ($C_{qs}$), four cavities with different closure types are identified. A regime map governed by $\textit{Fr}$ and $C_{qs}$ is constructed to estimate flow conditions associated with each cavity closure type. Each closure exhibits a different gas ejection mechanism, which in turn dictates the cavity geometry and the pressure in the cavity. Three-dimensional cavity closure is seen to exist for the supercavities at low $\textit{Fr}$. However, closure is nominally two-dimensional for supercavities at higher $\textit{Fr}$. At low $C_{qs}$, cavity closure is seen to be wake-dominated, while supercavities are seen to have interfacial perturbation near the closure at higher $C_{qs}$, irrespective of $\textit{Fr}$. With the measured gas fraction, a gas balance analysis is performed to quantify the gas ejection rate at the transitional cavity closure during its formation. For a range of $\textit{Fr}$, the transitional cavity closure is seen to be characterised by re-entrant flow, whose intensity depends on the flow inertia, dictating the gas ejection rates. Two different ventilation strategies were employed to systematically investigate the formation and maintenance gas fluxes. The interaction of wake and gas injection is suspected to dominate the cavity formation process and not the maintenance, resulting in ventilation hysteresis. Consequently, the ventilation gas flux required to maintain the supercavity is significantly less than the gas flux required to form the supercavity.
Against the proliferation of large language model (LLM) based Artificial Intelligence (AI) products such as ChatGPT and Gemini, and their increasing use in professional communication training, researchers, including applied linguists, have cautioned that these products (re)produce cultural stereotypes due to their training data. However, there is a limited understanding of how humans navigate the assumptions and biases present in the responses of these LLM-powered systems and the role humans play in perpetuating stereotypes during interactions with LLMs. In this article, we use Sequential-Categorial Analysis, which combines Conversation Analysis and Membership Categorization Analysis, to analyze simulated interactions between a human physiotherapist and three LLM-powered chatbot patients of Chinese, Australian, and Indian cultural backgrounds. Coupled with analysis of information elicited from LLM chatbots and the human physiotherapist after each interaction, we demonstrate that users of LLM-powered systems are highly susceptible to becoming interactionally entrenched in culturally essentialized narratives. We use the concepts of interactional instinct and interactional entrenchment to argue that whilst human–AI interaction may be instinctively prosocial, LLM users need to develop Critical Interactional Competence for human–AI interaction through appropriate and targeted training and intervention, especially when LLM-powered tools are used in professional communication training programs.
The RDA for dietary protein is likely to be insufficient for individuals with cystic fibrosis (CF), whereas a higher daily intake of ≥1.2g·kg−1·day−1 may be more appropriate in view of the increased risk of sarcopenia and reduced muscle quality. This study sought to characterise protein intake and diet quality in adults with cystic fibrosis (awCF), before and after elexacaftor/tezacaftor/ivacaftor (ETI) therapy, compared to healthy controls. Dietary intake was assessed by diet diary in awCF at baseline (BL, n=40) and at follow-up >3 months post ETI therapy (FUP, n=40), and in age-matched healthy controls (CON, n=80) free from known disease at a single time point. Protein intake dose and daily distribution, protein quality, protein source and overall diet quality was calculated for each participant. Both CON (1.39±0.47g·kg-1·day-1) and CF (BL: 1.44±0.52g·kg-1·day-1, FUP: 1.12±0.32g·kg-1·day-1) had a higher mean daily protein intake than the protein RDA of 0.75g·kg-1·day-1. There was a significant reduction in daily protein intake in the CF group at FUP (P=0.0003, d=0.73), with levels below the alternative suggested dietary intake of ≥1.2g·kg−1·day−1. There were no sex differences or noticeable effects on protein quality or source following the commencement of ETI therapy when compared to CON (all P>0.05), although overall diet quality decreased between time points (P=0.027, d=0.57). The observed reduction in daily protein intake in the present cohort emphasises the importance of ensuring appropriate dietary protein intake to promote healthy ageing in adults with CF. More research is needed to evidence base dietary protein requirements in this at-risk population.
Ultra-thin liquid sheets generated by impinging two liquid jets are crucial high-repetition-rate targets for laser ion acceleration and ultra-fast physics, and serve widely as barrier-free samples for structural biochemistry. The impact of liquid viscosity on sheet thickness should be comprehended fully to exploit its potential. Here, we demonstrate experimentally that viscosity significantly influences thickness distribution, while surface tension primarily governs shape. We propose a thickness model based on momentum exchange and mass transport within the radial flow, which agrees well with the experiments. These results provide deeper insights into the behaviour of liquid sheets and enable accurate thickness control for various applications, including atomization nozzles and laser-driven particle sources.
Cavitation bubble pulsation and liquid jet loads are the main causes of hydraulic machinery erosion. Methods to weaken the load influences have always been hot topics of related research. In this work, a method of attaching a viscous layer to a rigid wall is investigated in order to reduce cavitation pulsations and liquid jet loads, using both numerical simulations and experiments. A multiphase flow model incorporating viscous effects has been developed using the Eulerian finite element method (EFEM), and experimental methods of a laser-induced bubble near the viscous layer attached on a rigid wall have been carefully designed. The effects of the initial bubble–wall distance, the thickness of the viscous layer, and the viscosity on bubble pulsation, migration and wall pressure load are investigated. The results show that the bubble migration distance, the normalised thickness of the oil layer and the wall load generally decrease with the initial bubble–wall distance or the oil-layer parameters. Quantitative analysis reveals that when the initial bubble–wall distance remains unchanged, there exists a demarcation line for the comparison of the bubble period and the reference period (the bubble period without viscous layer under the same initial bubble–wall distance), and a logarithmic relationship is observed that $\delta \propto \log_{10} \mu ^*$, where $\delta =h/R_{max}$ is the thickness of the viscous layer h normalised by the maximum bubble radius $R_{max}$, $\mu ^* = \mu /({R_{max }}\sqrt {{\rho }{{\mathop {P}\nolimits } _{{atm}}}})$ is the dynamic viscosity $\mu$ normalised by water density $ \rho $ and atmospheric pressure $P_{atm}$. The results of this paper can provide technical support for related studies of hydraulic cavitation erosion.
Conceptual innovation is highly prized in Western Anglophone philosophy. Yet it often stems from a relatively narrow tradition that takes little account of contributions from other cultures and philosophical practices. We illustrate this point using the example of work done by Dalit feminists on identifying and addressing hermeneutical injustice. Despite their relevance, Dalit feminist contributions are virtually unknown and remain unrecognized in Anglophone philosophical discussions of hermeneutical injustice. This article aims to investigate the reasons for this neglect. One potential reason is the generally low status accorded to experiential knowledge in epistemology, which is pivotal to Dalit feminist accounts. Another reason concerns systematic bias against non-Western philosophy, which may reflect prejudicial stereotypes and the privileging of existing disciplinary norms. We argue that these reasons may explain the exclusion of Dalit feminists’ scholarship. In light of this, we offer two modest suggestions. First, philosophers should cultivate greater openness to citing texts by non-philosophers where these texts are relevant to the topic at hand. Second, we argue that a more embedded and extensive practice of cross-cultural philosophy or comparative philosophy is needed. These two suggestions may reduce neglect of philosophically rich traditions such as Dalit feminism.
Recommendations for immunisation practices in children with single ventricle CHD are lacking. A survey of 53 heart centres received responses from 40 centres (33 complete and 7 partial) revealing variability in immunisation recommendations. Only 11% have a written protocol. Immunisations were delayed before cardiopulmonary bypass in 94% (32/34) and after cardiopulmonary bypass in 97% (30/31), with 34% (13/38) re-dosing some immunisations post cardiopulmonary bypass. Further research is needed to develop guidelines.
Diet quality has been linked to socioeconomic status. However, evidence within rural and regional populations is lacking. This cross-sectional study examined the relationship between diet quality and socioeconomic position in adults living in rural and regional areas of Australia. The Australian Recommended Food Score (ARFS; range 0-73) measured diet quality (total and subscale scores). Area-level socioeconomic position was determined by postcode-linked Socio-Economic Index for Areas (SEIFA), Index of Relative Social Advantage and Disadvantage (IRSAD) scores, stratified into quintiles. The mean total ARFS (34.7; SD=9.1; n=836) was classified as “getting there”. Findings showed significantly lower mean total ARFS between SEIFA quintile 1 (1= lowest; mean total ARFS = 30.4; SD=10.2; categorised as ‘needs work’) compared to all other SEIFA quintiles (F (44,831) = 8.44, p = < 0.001). Linear regression, adjusting for age, sex, income, education, employment status, and household composition demonstrated significantly lower overall diet quality for SEIFA quintile 1 compared to SEIFA quintile 3 (B=-3.9; 95%CI [-6.2, -1.5]; p<0.001), and lower subscale scores for vegetables (B=-1.6; 95%CI [-2.7, -0.6]; p=0.003), fruit (B=-0.9; 95%CI [-1.6, -0.1]; p=0.018), and grains (B=-0.6; 95%CI [-1.3, -0.0]; p=0.050). After adjusting for individual confounders of diet quality, results indicate that lower area-level socioeconomic position remained associated with poorer diet quality in this sample of rural and regional Australian adults. This suggests that broader social and environmental factors unique to these areas may impact diet quality and amplify individual barriers to achieving a healthy diet.
The resilience of international supply chains is increasingly becoming a policy objective within international trade law making. Unilaterally, States have resorted to a myriad of trade tools to achieve this objective, including subsidizing domestic industries, facilitating critical minerals, and imposing tariffs on dominant supplying States to encourage supply diversification. In this context, the Indo-Pacific Economic Framework for Prosperity Supply Chain Agreement is the first major international trade agreement primarily aimed at achieving regional supply chain resilience. This Research Note explores the WTO compatibility of the economic interventions that underpin the Supply Chain Agreement’s ‘managed trade’ approach to supply chain resilience. First, it outlines the firm-centred governance approach that is central to supply chain management under the Supply Chain Agreement. Second, it explores the likely challenges and justifications of the envisaged interventions under GATT 1994 and Agreement on Safeguards. Finally, it reflects on the potential role of the WTO to shape cooperative supply chain governance interventions.
Assessing dimensions of neighborhoods could aid identification of contextual features that influence psychopathology in children and contribute to uncovering mechanisms underlying these associations.
Method:
The ABCD sample included 8,339 participants aged 9–10 from 21 U.S. sites. Mixed effect and structural equation models estimated associations of self-reported neighborhood threat/safety and county-level neighborhood threat (i.e., crime) and tract-level deprivation with psychopathology symptoms and indirect effects. Hypothesized mechanisms included emotion processing (adaptation to emotional conflict, task-active ROIs for emotional n-back) and cognition (EF and task-active ROIs for the stop-signal task); exploratory analyses included neural function (of amygdala to network and within-network resting state connectivity).
Results:
Associations of neighborhood deprivation and all symptoms were mediated by EF; links with psychotic-like experiences (PLEs) were mediated by retrosplenial temporal and dorsal attention within-network connectivity. In contrast, neighborhood threat was associated with attention difficulties, internalizing problems, and PLEs uniquely via default mode within-network connectivity; with attention difficulties, externalizing symptoms, and PLEs through amygdala-dorsal attention within-network connectivity, with PLEs and externalizing symptoms through visual within-network connectivity; with PLEs and attention difficulties through amygdala-sensorimotor connectivity, and with PLEs through amygdala-salience network connectivity.
Conclusion:
Neighborhood deprivation and threat predicted symptoms through distinct neural and cognitive pathways, with implications for prevention and intervention efforts at contextual levels.