To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure no-reply@cambridge.org
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
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 use of camera traps in wildlife conservation and ecological research is a popular method of data capture due in large part to the perceived low interference levels for the animals being studied. However, evidence exists that some species alter their behaviour when exposed to this technology. The primary aim of this study was to address whether researchers working with this technology in the ecology and forestry fields are making considerations for the possible impacts of cameras on animal behaviour. A secondary aim was to investigate how the use of this technology is framed in recent publications. In this rapid systematic literature review, we conducted a search on Web of Science and we identified 267 papers published in the last five years, in the fields of ecology and forestry, that met our inclusion criteria. We screened the studies for mentions of the impact of camera traps on the welfare of wildlife. Surprisingly, only 7.5% of the papers considered the possible animal welfare impacts of camera use on the wildlife species of interest in their study, with most comparing it to invasive methods and therefore framing this technology positively. We strongly encourage researchers working in this field to consider the impact of this technology on the specific species being studied. Whilst we recognise that the use of camera traps avoids direct handling of the animals, the short- and long-term effects of using this technology should not be ignored and should, at a minimum, be acknowledged in the limitations.
Psychotic-like experiences (PLEs) are associated with cognitive impairment and premature mortality, which may be indicative of accelerated biological ageing. Epigenetic clocks provide a measure of biological age based on DNA methylation, yet the long-term relationship between epigenetic ageing and PLEs remains largely unclear. We tested the relationship between epigenetic ageing and PLEs using a 17-year longitudinal approach.
Methods
Epigenetic ageing was calculated using four epigenetic clocks (DunedinPACE, Cortical EpiAge, Horvath, and PCGrimAge) in a sample from the Avon Longitudinal Study of Parents and Children (ALSPAC), a large population-based birth cohort (n = 1840, 56.8% females). We modeled epigenetic ageing from up to three repeated measures collected between ages 7 and 24 using a linear mixed-effects model to calculate (1) average epigenetic age [mean-centered intercept] and (2) rate of epigenetic ageing over this 17-year period [slope]. We then compared these two measures between individuals who developed PLEs in early adulthood (n = 95) against those who did not (n = 1745).
Results
Results showed that a faster rate (slope) of longitudinal PCGrimAge was predictive of PLEs (OR = 1.79, 95% CI [1.13–2.85], p = .014), although this association was no longer significant after adjusting for smoking. There was a non-significant effect in the same direction for other clocks. Average epigenetic age (mean-centered intercept) was not associated with PLEs.
Conclusions
Our findings suggest that the observed association between accelerated rate of epigenetic ageing, measured with PCGrimAge, from childhood to early adulthood, and the development of PLEs in early adulthood may be explained by smoking.
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.
Individuals can intentionally process task-relevant information while ignoring task-irrelevant information. This study aims to investigate how to promote forgetting of task-irrelevant information through noninvasive brain stimulation, utilizing direct suppression and thought substitute inhibition mechanisms.
Methods
Participants were cued to either remember task-relevant information while forgetting task-irrelevant information (IR condition) or to forget task-irrelevant items while remembering task-relevant information (IF condition). High-frequency rTMS was applied to activate the left ventrolateral prefrontal cortex (VLPFC, n = 32), right dorsolateral prefrontal cortex (DLPFC, n = 32), or vertex cortex (control condition, n = 32).
Results
Compared to vertex stimulation, (1) The Left VLPFC stimulation promoted the memory of task-relevant information in the IR condition, and resulted in a memory deficit for the task-irrelevant information in the IF condition (active forgetting). (2) The Right DLPFC stimulation promoted the forgetting of task-irrelevant information in the IF condition (active forgetting) and facilitated the memory of task-relevant information in the IR condition.
Conclusions
Stimulating left VLPFC or right DLPFC can promote active forgetting. Noninvasive brain stimulation can effectively regulate memory control.
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.
This article explores the relationship between Hessenberg varieties associated with semisimple operators with two eigenvalues and orbit closures of a spherical subgroup of the general linear group. We establish the specific conditions under which these semisimple Hessenberg varieties are irreducible. We determine the dimension of each irreducible Hessenberg variety under consideration and show that the number of such varieties is a Catalan number. We then apply a theorem of Brion to compute a polynomial representative for the cohomology class of each such variety. Additionally, we calculate the intersections of a standard (Schubert) hyperplane section of the flag variety with each of our Hessenberg varieties and prove that this intersection possesses a cohomological multiplicity-free property.
As the use of computational text analysis in the social sciences has increased, topic modeling has emerged as a popular method for identifying latent themes in textual data. Nevertheless, concerns have been raised regarding the validity of the results produced by this method, given that it is largely automated and inductive in nature, and the lack of clear guidelines for validating topic models has been identified by scholars as an area of concern. In response, we conducted a comprehensive systematic review of 789 studies that employ topic modeling. Our goal is to investigate whether the field is moving toward a common framework for validating these models. The findings of our review indicate a notable absence of standardized validation practices and a lack of convergence toward specific methods of validation. This gap may be attributed to the inherent incompatibility between the inductive, qualitative approach of topic modeling and the deductive, quantitative tradition that favors standardized validation. To address this, we advocate for incorporating qualitative validation approaches, emphasizing transparency and detailed reporting to improve the credibility of findings in computational social science research when using topic modeling.
We introduce a family of polynomials, which arise in three distinct ways: in the large N expansion of a matrix integral, as a weighted enumeration of factorizations of permutations, and via the topological recursion. More explicitly, we interpret the complex Grassmannian $\mathrm {Gr}(M,N)$ as the space of $N \times N$ idempotent Hermitian matrices of rank M and develop a Weingarten calculus to integrate products of matrix elements over it. In the regime of large N and fixed ratio $\frac {M}{N}$, such integrals have expansions whose coefficients count factorizations of permutations into monotone sequences of transpositions, with each sequence weighted by a monomial in $t = 1 - \frac {N}{M}$. This gives rise to the desired polynomials, which specialise to the monotone Hurwitz numbers when $t = 1$. These so-called deformed monotone Hurwitz numbers satisfy a cut-and-join recursion, a one-point recursion, and the topological recursion. Furthermore, we conjecture on the basis of overwhelming empirical evidence that the deformed monotone Hurwitz numbers are real-rooted polynomials whose roots satisfy remarkable interlacing phenomena. An outcome of our work is the viewpoint that the topological recursion can be used to “topologise” sequences of polynomials, and we claim that the resulting families of polynomials may possess interesting properties.
Antimicrobial prescribing differences between physicians and nurse practitioners (NPs) remain poorly characterized. We compared prescribing practices at a safety-net hospital. NPs adhered more to pneumonia guidelines, while physicians had better adherence for abdominal and urinary infections. Ineffective therapy was more common for NPs. These gaps highlight important stewardship opportunities.
Morphological matrices (MMs) have traditionally been used to generate concepts by combining different means. However, exploring the vast design space resulting from the combinatorial explosion of large MMs is challenging. Additionally, all alternative means are not necessarily compatible with each other. At the same time, for a system to achieve long-term success, it is necessary for it to be flexible such that it can easily be changed. Attaining high system flexibility necessitates an elevated compatibility with alternative means of achieving system functions, which further complicates the design space exploration process. To that end, we present an approach that we refer to as multi-objective technology assortment combinatorics. It uses a shortest-path algorithm to rapidly converge to a set of promising design candidates. While this approach can take flexibility into account, it can also consider other quantifiable objectives such as the cost and performance of the system. The efficiency of this approach is demonstrated with a case study from the automotive industry.
The escalating presence of microplastics (<5 mm) in drinking water presents urgent environmental and health challenges, yet the United Nations Environment Programme’s (UNEP) Global Plastics Treaty draft texts, including UNEP/PP/INC.5/4 and the Chair’s Text, lack robust provisions to address this issue. This Letter to the Editor analyzes deficiencies in the treaty’s approach, identifying critical gaps in standardized terminology, globally consistent monitoring methodologies, comprehensive source control and enforceable international regulations. Leveraging insights from California’s innovative microplastics monitoring framework, which employs spectroscopy-based detection and provisional health thresholds, we highlight scalable solutions for global policy. Key obstacles include technological disparities, economic reliance on plastic production, limited toxicological data and geopolitical barriers to unified action. We propose targeted strategies for the Intergovernmental Negotiating Committee (INC-5.2), including adopting precise microplastics definitions, establishing universal detection protocols, regulating both primary and secondary microplastic sources and supporting research and capacity-building in low-resource regions. These measures aim to enhance the treaty’s ability to mitigate microplastic pollution in drinking water, fostering science-driven global cooperation to protect ecosystems and public health.
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.