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We present a theoretical framework and validation for manipulating instability growth in shock-accelerated dual-layer material systems, which feature a light–heavy interface followed by two sequential heavy–light interfaces. An analytical model is first developed to predict perturbation evolution at the two heavy–light interfaces, explicitly incorporating the effects of reverberating waves within the dual-layer structure. The model identifies five distinct control regimes for instability modulation. Shock-tube experiments and numerical simulations are designed to validate these regimes, successfully realising all five predicted states. Notably, the selective growth stagnation of a perturbation at either the upstream or downstream heavy–light interface is realised numerically by tuning the initial separation distances of the three interfaces. This work elucidates the critical role of the wave dynamics in governing interface evolution of a shocked dual layer, offering insights for mitigating hydrodynamic instabilities in practical scenarios such as inertial confinement fusion.
As intelligence technology advances, the boundaries between humans and machines blur, prompting questions regarding human identity and agency. While opera has traditionally explored such existential tensions, contemporary productions often emphasise technological narratives, potentially overshadowing human-centred perspectives. This article investigates music’s expressive potential to bridge these divergent viewpoints, positing it as a distinct form of ‘listening’ to and ‘knowing’ the world. Through a case study of Hao Weiya’s chamber opera AI Variation (2021), it probes how a musical approach communicates intricate ethical and existential questions posed by advancing AI technologies. The findings reveal that music’s non-linguistic nature creates an experiential space to explore, feel and contemplate human experiences. Orchestral voices craft sonic landscapes that invite contemplation on being and perception in an AI-driven world, and music conveys complexities beyond what words alone can express. The article illuminates how music contributes to a humanist response to technological advances, enriching cultural and philosophical discourse.
Studying rotating convection under geo- and astrophysically relevant conditions has proven to be extremely difficult. For the rotating Rayleigh–Bénard system, van Kan et al. (J. Fluid Mech., vol. 1010, 2025,A42)have now been able to massively extend the parameter space accessible by direct numerical simulations. Their progress relies on a rescaling of the governing Boussinesq equations, which vastly improves numerical conditioning (Julien et al., arXiv:2410.02702). This opens the door for investigating previously inaccessible dynamical regimes and bridges the gap to the asymptotic branch of rapidly rotating convection.
We address the anti-trans/queer panic integral to the ascendance of authoritarian politics in America and respond by calling on all political scientists to “queer” political science by undoing the cisheteronormativity of the discipline. We contend that this is not the special obligation of LGBTQ scholars but all political scientists. In this we follow Eve Sedgwick’s orientation away from a “minoritizing” to a “universalizing” epistemological perspective that situates this responsibility relative to resisting democratic decline.
We consider families of special cycles, as introduced by Kudla, on Shimura varieties attached to anisotropic quadratic spaces over totally real fields. By augmenting these cycles with Green currents, we obtain classes in the arithmetic Chow groups of the canonical models of these Shimura varieties (viewed as arithmetic varieties over their reflex fields). The main result of this paper asserts that generating series built from these cycles can be identified with the Fourier expansions of non-holomorphic Hilbert-Jacobi modular forms. This result provides evidence for an arithmetic analogue of Kudla’s conjecture relating these cycles to Siegel modular forms.
Scholars have identified several temporal challenges in foreign policymaking, such as variable time horizons and maintaining commitment or resolve over time. While the behavioural turn has emphasised leaders and their subjective perceptions, research often relies on rationalist conceptions of objective and linear time and struggles to assess leaders’ subjective perceptions of it. This paper theorises time as an intrinsic aspect of narrative reasoning in foreign policy, introducing a ‘temporal definition of the situation’ (TDoS) framework to capture leaders’ situation-specific subjective time perceptions. I then operationalise the TDoS framework’s key temporal features and show how it can be empirically examined. The value of the TDoS is illustrated by assessing the temporal perceptions of Bush and Obama regarding Iran’s nuclear programme, showing how their distinct definitions of the foreign policy situation shaped their subjective time perceptions and their corresponding responses. I conclude by discussing how this advancement can enhance behavioural research, provide insights into the ‘why now?’ questions surrounding leaders’ actions, and challenge existing understandings of time’s impact on foreign policymaking.