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While flow confinement effects on a shear layer of an one-sided or submerged vegetation array’s interface have been widely studied, turbulent interactions between shear layers in channels with vegetation on both sides remain unclear. This study presents laboratory experiments investigating flow adjustments and turbulent interaction within a symmetrical vegetation–channel–vegetation system, considering varying array widths and densities. In the outer shear layer, the shear stress is primarily balanced by the pressure gradient. As the array extends laterally, the outer penetration of the shear layer reduces from a fully developed thickness to the half-width of the open region, resulting in flow confinement. Flow confinement enhances the pressure gradient, which increases the interior velocity and shear stress at the interface. Despite the time-averaged shear stress being zero at the centreline when the shear layer is confined, the shear instabilities from both sides interact, producing significant turbulent events at the centreline with equal contributions from each side. Furthermore, the two parallel vortex streets self-organised and created a wave response with a $\pi$-radian phase shift , where alternating vortex cores amplify the pressure gradient, intensifying coherent structures and facilitating momentum exchange across the channel centreline. Although the turbulent intensity is enhanced, the decreased residence time for turbulent flow events may limit transport distance. Overall, the shear layer that develops on one interface acts as an additional resistance to shear turbulence on the other interface, leading to a more rapid decline of shear stress in the open region, despite a higher peak at the interface.
This study aimed to update the incidence of device-associated healthcare-associated infections (DA-HAIs), and to characterize pathogen distribution and carbapenem-resistant Enterobacteriaceae (CRE) detection among ICU patients in Shanghai, China.
Methods:
Prospective surveillance in 223 ICUs using standardized International Nosocomial Infection Control Consortium methodology (INICC) protocols collected patient-level data on demographics, microbiology, device use, and DA-HAIs. Trends, annual percent change (APC) and average annual percent change (AAPC) were estimated using Joinpoint regression models.
Results:
The overall DA-HAIs incidence density in ICUs was 1.67 per 1000 catheter-days for catheter-associated urinary tract infection (CAUTI) (95% CI: 1.62–1.73), 0.59 per 1000 central line-days for central line-associated bloodstream infection (CLABSI) (95% CI: 0.56–0.63), and 4.63 per 1000 ventilator-days for ventilator-associated pneumonia (VAP) (95% CI: 4.51–4.76). Significant reductions were observed in VAP (AAPC: −15.36%; P < 0.001) and CLABSI (AAPC: −11.23%; P < 0.001). Pathogen distributions varied by infection type, with Enterococcus faecium (17.22%) and Klebsiella pneumoniae (16.63%) predominating in CAUTI patients, Klebsiella pneumoniae (26.87%) in CLABSI patients, and Acinetobacter baumannii (37.60%) in VAP patients. The overall CRE detection rate was 33.67% in CAUTI patients, 37.56% in CLABSI patients, and 35.24% in VAP patients.
Conclusions:
Although DA-HAI rates showed significant declines, the persistently high CRE prevalence underscores substantial antimicrobial resistance challenges in Chinese ICUs.
In the years since the 2016 presidential election, questions of partisan identity and partisan polarization have burst into broader public discourse, and they have invariably been intertwined with curiosity about gender and gendered behavior, especially as it relates to partisanship and voting. What is women’s role in creating and sustaining the current political moment, or is politics as we experience it today shaped entirely by and for men? Political science as a discipline has of course tackled these questions for a much longer time, even though for some scholars, the current political moment has bestowed greater urgency on these long-running discussions and puzzles. However, even within political science, these two phenomena and their related questions have not always been examined in tandem.
Recent literature has shown that appetite loss during ageing can lead to negative health outcomes in older adults, particularly malnutrition and mortality. However, its association with functional decline and the mechanisms driving this relationship are not well explored. This review summarises the current evidence regarding the potential effects of appetite loss on frailty and functional outcomes. Despite the limitations due to heterogeneous methodologies, including study designs, population characteristics and appetite assessments, most studies indicate that older adults with poor appetite tended to exhibit poor physical performance and increased functional limitations. Furthermore, the simultaneous weight loss in individuals experiencing appetite loss was associated with a higher risk of functional impairments. Finally, emerging evidence connects reduced appetite to biomarkers of ageing, including epigenetic alterations, chronic inflammation and the upregulation of GDF-15. Therefore, loss of appetite is a potential earlier marker of loss of function that deserves further investigation. Adopting a geroscience perspective may enhance our understanding of appetite loss during ageing and foster the development of effective interventions.
In compressible turbulent boundary layers (CTBLs), the strong Reynolds analogy (SRA) refers to a set of quantitative relationships between temperature and velocity fluctuations. The essence of the SRA is the linear relationship between these fluctuations in large-scale motions. We investigate the transport processes of the second-order statistical moments associated with temperature and velocity fluctuations to reveal the physical mechanisms underlying this linear correlation. An important finding is that there exists a strong linear mechanism between the turbulent production of velocity and temperature fluctuations. Nonlinear mechanisms, such as the viscous-thermal dissipation, the work contribution, and particularly the pressure term, lead to the failure of the existing SRAs in the outer layer. Based on the above findings, a refined SRA (RSRA) is proposed, which better describes the quantitative relation between the temperature and velocity fluctuation intensities. An approximate expression for the turbulent Prandtl number under different Mach numbers and wall-cooling conditions is derived with the newly proposed RSRA. The relations proposed in this paper are validated through the direct numerical simulation data of flat-plate zero-pressure-gradient CTBLs at different Mach numbers and wall temperatures.
This article examines the recent transformation of marriage rituals in Turkey from the perspective of young brides. Based on ethnographic research conducted in Istanbul and Bursa in 2017–19, it discusses how young women construct their marital imaginaries through extravagant ceremonies and festivities such as proposals, photographs, henna nights, and weddings. Drawing from the theory of ritual economy, the article argues that their gendered desire for lavish spending does not position brides as victims of either traditional Turkish customs or the consumer market. Rather, the article emphasizes young women’s aspirations to romance and a sense of uniqueness, and their desire to feel as if they are “living a fairy tale.” These bridal imaginaries reflect the rise of neoliberal individualism, upward social mobility, and status-seeking in Bourdieu’s sense. The article’s findings contribute to the hitherto limited scholarship on changing marriage rituals and the wedding industry in Turkey.
Persistent physical symptoms (PPS) are associated with functional impairment, psychological distress and high healthcare costs. They often span multiple diagnostic categories, resulting in substantial challenges for patients and healthcare systems. Understanding the shared processes underlying PPS is crucial to improving outcomes. PPS are shaped by complex and interacting psychological and physiological mechanisms, which interact to perpetuate the condition. A transdiagnostic approach, which targets shared underlying processes, may offer a more efficient and effective framework for treatment compared with traditional disorder-specific interventions. This article describes the theory for a transdiagnostic approach and evidence for its effectiveness. We describe several theoretical models and approaches to understanding the underlying mechanisms of PPS, including central sensitisation, avoidance behaviours, emotion dysregulation and cognitive distortions. We describe interventions, particularly those incorporating key principles of cognitive–behavioural therapy. The proposed approach integrates these insights to inform a comprehensive treatment model.
This article argues that the image of the ‘bad German’ and the animus that accompanied it was tempered by that of the defeated German and the pity Italians in liberal and Catholic circles expressed for German misery. Such sympathetic expressions were not confined to the ruling elite but circulated broadly in media representations and in accounts given by Italians who travelled north in the early postwar years. To view Germans as objects of pity was an empowering act and a humanising one. As an emotion and a practice, pity provided a blueprint for how to think and feel about the former enemy – and oneself – that, in Italy, reinforced Catholic and liberal frameworks for political and social reconstruction. Important to constructions of East–West difference and to the Christian democratic groundings of Western Europe, pity continues to shape debates on European identity, immigration and humanitarian aid.
The enhanced computing power of the onboard flight control system and the low flapping frequency have made real-time position and attitude control possible for large flapping-wing flying robots (LFWFRs). Therefore, it is necessary to design an efficient flapping load calculation method to provide the load situation of the flapping wings. To address this problem, we establish a three-dimensional aeroelastic model by coupling the finite element method and state-space airloads theory. This model considers the interaction between aerodynamic loads, inertial loads, and flapping-wing structural elasticity during the flapping motion, which could quickly calculate the instantaneous aerodynamic loads and inertial loads of flapping wings under different flight conditions. The accuracy of the model was verified through vacuum and wind tunnel experiments. Experiments under various flight conditions demonstrate the effectiveness and reliability of the proposed method, and the method could be used to guide the rapid iterative upgrade and control law design of LFWFRs.