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Pulsatile fluid flows through straight pipes undergo a sudden transition to turbulence that is extremely difficult to predict. The difficulty stems here from the linear Floquet stability of the laminar flow up to large Reynolds numbers, well above experimental observations of turbulent flow. This makes the instability problem fully nonlinear and thus dependent on the shape and amplitude of the flow perturbation, in addition to the Reynolds and Womersley numbers and the pulsation amplitude. This problem can be tackled by optimising over the space of all admissible perturbations to the laminar flow. In this paper, we present an adjoint optimisation code, based on a GPU implementation of the pseudo-spectral Navier–Stokes solver nspipe, which incorporates an automatic, optimal checkpointing strategy. We leverage this code to show that the flow is susceptible to two distinct instability routes: one in the deceleration phase, where the flow is prone to oblique instabilities, and another during the acceleration phase with similar mechanisms as in steady pipe flow. Instability is energetically more likely in the deceleration phase. Specifically, localised oblique perturbations can optimally exploit nonlinear effects to gain over nine orders of magnitude in energy at a peak Reynolds number of ${\textit{Re}}_{\textit{max}}\approx 4000$. These oblique perturbations saturate into regular flow patterns that decay in the acceleration phase or break down to turbulence depending on the flow parameters. In the acceleration phase, optimal perturbations are substantially less amplified, but generally trigger turbulence if their amplitude is sufficiently large.
This article sheds light on the understudied significance of Islam, Communism, and global politics in defining what constituted an acceptable “religion” (shūkyō 宗教) in wartime Japan. An analysis of the Japanese Imperial Diet’s debates on the place of Islam in the Religious Organizations Law of 1939, which defined state-sanctioned religious organizations, reveals that Muslim attention from around the world, international politics, the global spread of Communism, and the relatively short history of Islam in Japan, affected politicians’ decision not to mention Islam as a religious organization in the law. While previous literature on the Religious Organizations Law has not adequately addressed the significance of international and non-Euro-American transnational influences, this article argues that lawmakers viewed the power of transnational Muslim and Communist networks as crucial when defining both officially acceptable “religion” and the Shrine (jinja 神社), or Shrine Shinto, as the national core to be protected under this law. The debates surrounding Islam offer fertile ground for examining the significance of global affairs in determining acceptable forms of “religion” in Japan, as well as the broader implications of what Japanese state officials called “religion” and “thought” (shisō 思想) in wartime Japanese and world politics.
The paper explores the accuracy of WiFi-Round Trip Timing (RTT) positioning in indoor environments. Filtering techniques are applied to WiFi-RTT positioning in indoor environments, enhanced by Residual Signal Strength Indicator (RSSI)-based outlier detection. A Genetic and Grid filter are compared with a Particle filter and single-epoch least-squares across a range of test scenarios. In static scenarios, 67% of trials had sub-metre accuracy and 90.5% had a root mean square error (RMSE) below 2 m. In Non-Line-of-Sight (NLOS) conditions, 38% of trials had sub-metre accuracy, whereas for environments with full Line-of-Sight (LOS) conditions, 95.2% of trials had sub-metre accuracy. In scenarios with motion, 22.2% of trials had sub-metre accuracy. RSSI-based outlier detection in NLOS conditions, provided an average improvement of 41.3% over no outlier detection across all algorithms in the static and 14% in the dynamic tests. The Genetic filter achieved a mean improvement of 49.2% in the static and 47% in the dynamic tests compared with least squares.
Negative dependence in tournaments has received attention in the literature. The property of negative orthant dependence (NOD) was proved for different tournament models with a special proof for each model. For general round-robin tournaments and knockout tournaments with random draws, Malinovsky and Rinott (2023) unified and simplified many existing results in the literature by proving a stronger property, negative association (NA). For a knockout tournament with a non-random draw, they presented an example to illustrate that ${\boldsymbol{S}}$ is NOD but not NA. However, their proof is not correct. In this paper, we establish the properties of negative regression dependence (NRD), negative left-tail dependence (NLTD), and negative right-tail dependence (NRTD) for a knockout tournament with a random draw and with players being of equal strength. For a knockout tournament with a non-random draw and with equal strength, we prove that ${\boldsymbol{S}}$ is NA and NRTD, while ${\boldsymbol{S}}$ is, in general, not NRD or NLTD.
Published in 1744, Musicaliske Elementer, eller Anleedning til Forstand paa De første Ting udi Musiquen (Musical Elements, or A Guide to Understanding the First Things about Music) is the first music textbook to have been published in Norway (then part of Denmark–Norway) and the first of its kind in the Danish language. It is an important document in the history of music theory in Scandinavia. Its author, Johan Daniel Berlin (1714–1787), was the ‘privileged town musician’ (stadsmusikant) in Trondheim and a central figure in the musical life of eighteenth-century Norway. Berlin was remarkably well-read on contemporary German music theory, owning an impressive collection of then-current theory texts. This article explores Berlin’s textbook through the theoretical-methodological perspective of intercultural transfer and positions its music-theoretical contents in relation to both contemporaneous continental European music theory and later Norwegian and Danish sources. In addition to highlighting possible paths of transfer from German sources to Norway, the article discusses points of local Norwegian difference, such as Berlin’s surprisingly positive attitude towards quintuple metre and the way of naming pitches in Norwegian sources from the eighteenth century.
The treatment of longstanding severe eating disorders is a public concern amid rising service pressures and legal cases. These cases raise complex issues about the interface between legislative schemes, restrictive practices, best interests, treatment refusal and potential interaction with assisted dying legislation, when patients lack capacity yet clearly express wishes.
Large language models (LLMs) like OpenAI’s ChatGPT, Google’s Gemini and Anthropic’s Claude can be useful tools in psychiatric practice, helping with tasks such as searching for information, managing administrative work and supporting education. This article demystifies how these tools work by explaining their core operational principles and noting their key limitations, including the risks of confabulation (fabricating information), sycophancy and knowledge cut-offs. It provides practical guidance on mitigating these risks through structured ‘prompt engineering’ and offers a safety framework for integrating LLMs into low-risk administrative and educational workflows. The article stresses the importance of approaching these technologies with caution by independently verifying information, adhering to UK data protection laws and upholding the principles of best practice in patient care. The goal is to help clinicians use these powerful but fallible technologies wisely, ensuring that patient safety and professional responsibility remain paramount as they explore these new tools.
In this article, a circularly polarized dielectric resonator antenna (DRA) array with conformal characteristics and improved specific absorption rate (SAR) has been proposed for X-band applications. The proposed structure has been fed through the corporate feed network which excites a radiating mode inside DRA, i.e., $TE_{1\delta1}$. This mode has been utilized to enhance the impedance bandwidth which is below −10 dB for both the E- and H-plane so as to meet the requirements of next-generation defense communication and low-cost satellite systems. To generate the axial ratio (AR), the extended off-set feed has been employed to provide the required 90$^{\circ}$ phase shift. Further, in order to enhance the gain and reduce the SAR, an electromagnetic band gap structure has been used as a reflector. Furthermore, multiple arrays have been introduced to extend the coverage area through beam-forming. The proposed design has been fabricated for the experimental validation. The measured IBW and ARBW is 34.74% and 12.2%, respectively. The gain is 10.1 dBic throughout the band of operation along with the radiation efficiency above 85% in various bending conditions. The SAR is much below the permissible limit of 1.6 W/kg. Thus, the proposed array is compact, and it clearly achieves a smaller footprint, better IBW, ARBW and a low SAR with potential prospect for X-band purposes.
In this paper, we investigate a competitive market involving two agents who consider both their own wealth and the wealth gap with their opponent. Both agents can invest in a financial market consisting of a risk-free asset and a risky asset, under conditions where model parameters are partially or completely unknown. This setup gives rise to a nonzero-sum differential game within the framework of reinforcement learning (RL). Each agent aims to maximize his own Choquet-regularized, time-inconsistent mean-variance objective. Adopting the dynamic programming approach, we derive a time-consistent Nash equilibrium strategy in a general incomplete market setting. Under the additional assumption of a Gaussian mean return model, we obtain an explicit analytical solution, which facilitates the development of a practical RL algorithm. Notably, the proposed algorithm achieves uniform convergence, even though the conventional policy improvement theorem does not apply to the equilibrium policy. Numerical experiments demonstrate the robustness and effectiveness of the algorithm, underscoring its potential for practical implementation.
Cenobamate (CNB) has shown efficacy in reducing seizures in drug-resistant epilepsy (DRE) in clinical trials. We conducted a retrospective study at the Centre hospitalier de l’Université de Montréal epilepsy clinic to assess CNB’s real-world efficacy and safety. Among 109 patients, follow-up data were available for 68 at 3 months, 53 at 6 months and 54 at 12 months. Median seizure frequency reduction was 50.0%, 57.3% and 73.3%, respectively. Seizure freedom at 12 months was 25.9%. CNB was discontinued in 8.3% of individuals due to adverse events (non-serious) or treatment inefficacy. Our findings support CNB’s effectiveness in a DRE population.
This article examines the relational self-care practices of migrant Chinese women working as massage workers in the United States (hereinafter referred to as Chinese massage workers). Threading both the bodily and the intimate, Chinese massage workers offer care and relaxation for their clients through the modality of touch and quiet comfort. A wealth of scholarly work highlights the complexities of migrant massage workers’ daily lives and their paid labor of care. Thus far, the study of migrant massage workers focuses mainly on their romantic, familial, and work relationships. Little is known about the relational self-care practices that migrant massage workers engage in. Drawing on 20 months of ethnographic fieldwork, this article examines the practice of Chinese massage workers caring for one another through the intellectual genealogy of self-care in Black feminist scholarship. Through an examination of relational self-care performed by and for Chinese massage workers, this article shifts the focus from analyzing the expected performances of care-giving by migrant women massage workers within the economy of racial capitalism to a reconceptualization of self-care as a relational practice.
In this paper, we consider the flow of a nematic liquid crystal in the domain exterior to a small spherical particle. We work within the framework of the $\unicode{x1D64C}$-tensor model, taking into account the orientational elasticity of the medium. Under a suitable regime of physical parameters, the governing equations can be reduced to a system of linear partial differential equations. Our focus is on precise far-field asymptotics of the flow velocity with an emphasis on its anisotropic behaviour. We are able to analytically characterize the flow pattern and compare it with that of the classical isotropic Stokes flow. The expression for velocity away from the particle can be computed numerically or symbolically.
Emerging evidence has led to an interim review of the existing 2022 Canadian Stroke Best Practice Recommendations (CSBPR) for Acute Stroke Management, 7th edition, recommendations for endovascular treatment of acute ischemic stroke. This manuscript presents an update of the recommendations for endovascular treatment, addressing the issues of posterior circulation stroke, stroke with a large core and stroke with medium vessel occlusion (MeVO). These recommendations are a timely opportunity to reassess current processes to ensure efficient access to acute stroke diagnostics, treatments and management strategies, proven to reduce mortality and morbidity. These updated recommendations supersede the endovascular thrombectomy recommendations included in the 2022 publication of the CSBPR acute stroke management module. Additional materials to support timely implementation and quality monitoring of these recommendations are available at www.strokebestpractices.ca
The structural stability of barrier layers is critical for the long-term effectiveness of landfill remediation projects, although leachate pumping and organic contamination can cause structural degradation, reduce remediation performance, and increase the risk of pollutant release. The objectives of this study were to determine the consolidation–rebound mechanisms of sand–bentonite mixtures through standardized tests and to analyze deformation under diesel contamination using multi-scale approaches, including pore-structure characterization, particle-size distribution, cation exchange capacity, and oil-blocking effects. The results revealed that uncontaminated soil (0.0 wt.% diesel) exhibited non-linear compression behavior, with an initial decrease and a subsequent increase with increasing sand content; when the consolidation pressure exceeded 400 kPa, the compression rate decreased markedly. The compression deformation of the contaminated soil increased and was positively correlated with the sand and diesel contents, with accelerated deformation at >4.0 wt.% diesel. The rebound capacity decreased under combined sand–diesel effects. Microstructural analysis indicated that initial compression was controlled by inter-aggregate pores, whereas mid- to late-stage compression was influenced by intra-aggregate pore evolution and particle breakage. Increased diesel content shifted aggregate breakage from single/secondary to tertiary patterns, altering later compression behavior. Coupled hydration reduction and enhanced oil-blocking suppressed rebound significantly, worsening with increasing diesel content. Technical–economic analysis revealed that pure bentonite (0% sand) was optimal under uncontaminated conditions and that a 10% sand mixture was best under contaminated conditions. The sand–bentonite barrier exhibited amplified consolidation–rebound deformation and reduced stability with increasing sand and diesel contents, providing a theoretical basis for long-term landfill remediation assessment.