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Free transverse oscillations of an elastically mounted circular cylinder with low mass-damping are studied with a focus on the effects of the cylinder end condition on structural oscillations and vortex shedding. While the top end of the cylinder pierces the free surface of a water channel, the lower end is changed to have three end conditions: an attached endplate, an endplate unattached from the cylinder at varying gaps and no endplate. All three response branches are examined, with the reduced velocity sweeping $2 \le {U^\ast } \le 15$ (corresponding to a Reynolds number range of $2000 \le Re \le 14\;700$). Although the cylinder oscillations are unaffected by the end condition in the initial and upper branches, they show significant dependency on the end condition in the lower branch. When the endplate is attached or unattached with a small gap, the upper-to-lower branch transition occurs with a sudden decrease in oscillation amplitude, after which the lower branch maintains a near-constant amplitude. For larger gaps or no endplate, with increasing reduced velocity, the oscillation amplitude decreases gradually from its peak without any discernible sign of transition between the upper and lower branches. The three-dimensional effects of the gap are the basis for these differences in oscillation. Atop the strong tip vortex, a low-magnitude streamwise velocity region develops downstream of the cylinder, which delays upper-to-lower branch transition over the cylinder span that sees this low-velocity region. With increasing gap, this low-velocity region and the delay in transition spread over larger spanwise extents, forcing the overall body to oscillate at larger amplitudes.
Reducing rehospitalization has been a primary focus of hospitals and payors. Recurrence of Clostridioides difficile infection (CDI) is common and often results in rehospitalization. Factors that influence rehospitalization for CDI are not well understood.
Objective:
To determine the risk factors that influence rehospitalization caused by CDI.
Design:
A retrospective cohort study from January 1, 2018, to December 31, 2018, of patients aged ≥18 who tested positive for C. difficile while hospitalized.
Setting:
Academic hospital.
Methods:
The risk of rehospitalization was assessed across exposures during and after the index hospitalization using a Cox proportional hazards model. The primary outcome of this study was 60-day CDI-related rehospitalization.
Results:
There were 559 hospitalized patients with a positive CD test during the study period, and 408 patients were included for analysis. All-cause rehospitalization was 46.1% within 60 days of the index hospital discharge. Within 60 days of discharge, 68 patients developed CDI, of which 72.5% (49 of 68) were rehospitalized specifically for the management of CDI. The risk of rehospitalization in patients with CDI was higher among patients who were exposed to systemic antibiotics ([adjusted hazard ratio] aHR: 2.78; 95% CI, 1.36–5.64) and lower among patients who had post-discharge follow-up addressing C. difficile (aHR: 0.53; 95% CI, 0.28–0.98).
Conclusions:
Exposure to systemic antibiotics increased the risk of rehospitalization due to CDI, while post-discharge follow-up decreased the risk of rehospitalization due to CDI. Comprehensive transitions of care for hospitalized patients with C. difficile may reduce the risk of CDI-related rehospitalization.
This article develops an account of territorial justice to understand what is owed to people at risk of climate displacement. I argue that the aim of territorial justice is to secure a globally recognized status, the status of being an equal common possessor of the earth. As a common possessor, every inhabitant of the globe has a claim to a “place” in the world where they can access minimally just material conditions and political institutions, securely pursue their located practices, and exercise self-determination together with others. I apply this theory to generate prescriptions for a just policy response to the risk of climate displacement. Where possible, I argue that a just response should focus on mandatory global taxation to support in situ adaptation. In cases where relocation becomes inevitable, I outline the implications for how just relocation regime should be structured.
This article focuses on the discussions around female athletes and their emotions in the German and Austrian press of the 1920s. In the course of the sports boom of the interwar years, more and more women participated in public sports competitions and demanded their right to be taken seriously as sportswomen. Their public appearance aroused mixed feelings and heated social debates about how much and what kind of sport was appropriate for women, which were reflected in discussions and narratives around the figure of the “sportsgirl.” Sportsgirls were imbued with a novel emotional style to which ambition and audacity – ways of feeling that were cultivated during competitive sports and that contrasted with traditional bourgeois female feeling rules – were key. Sportsgirls and their emotional style were the subject of many stories, reports, pictures, and articles that were published in the growing sports press of the time – and they were judged and evaluated for the emotional style they embodied. The press was a potent platform and site of the formation of feeling rules; as such, discussions around sportsgirls point to the (embodied) experiences of the athletes and indicate how the emotional style that derived from them was turned into a tool to reshape social conventions and feeling rules for women beyond the sports arena.
Irregular migrants’ flows have, for several years now, been making the news headlines and are at the core of political debates. In a context of polycrisis—characterized by the post COVID-19 pandemic, climate change and its devastating impacts; the disruption of labor markets caused by the fourth industrial revolution and artificial intelligence; or geopolitical tensions in different parts of the globe that threaten the livelihoods of many communities—the desire to move from the developing and emerging world to the West can increase.
Adolescents with severe cardiogenic shock can present to both paediatric and adult centres. We present six adolescent children who had extracorporeal membrane oxygenation consultation fast-tracked with clinical care input from the adult multidisciplinary team, including interhospital transfers on extracorporeal membrane oxygenation. After recovery on conventional cardiogenic shock care or extracorporeal membrane oxygenation, or bridge to transplant, all had favourable neurologic outcome.
The transition from childhood to adolescence presents elevated risks for the onset of psychopathology in youth. Given the multilayered nature of development, the present study leverages the longitudinal, population-based Adolescent Brain Cognitive Development Study to derive ecologically informed risk/resilience profiles based on multilevel influences (e.g., neighborhood and family socioeconomic resources, parenting, school characteristics) and their transition pathways and examine their associations with psychopathology. Latent profile analysis characterized risk/resilience profiles at each time point (i.e., baseline, Year-1, Year-2); latent transition analysis estimated the most likely transition pathway for each individual. Analysis of covariance was used to examine associations between profile membership at baseline (i.e., ages 9–11) and psychopathology, both concurrently and at Year-2 follow-up. Further, we examined the associations between profile transition pathways and Year-2 psychopathology. Four distinct profiles emerged across time – High-SES High-Protective, High-SES Low-Protective, Low-SES High-Family-Risk, and Low-SES High-Protective. Despite reasonably high stability, significant transition over time among profiles was detected. Profile membership at baseline significantly correlated with concurrent psychopathology and predicted psychopathology 2 years later. Additionally, profile transition pathways significantly predicted Year-2 psychopathology, exemplifying equifinality and multifinality. Characterizing and tracing shifts in ecologically informed risk/resilience influences, our findings have the potential to inform more precise intervention efforts in youth.
This paper discusses competing visions of the decolonization of Ghana’s economy during the first decade of the country’s independence from Britain (1957–1966), and the agency and horizon of choice available to the Ghanaian decision-makers in charge of implementing these visions. It focuses on Ghana’s construction industry, both as an important part of the national economy and as a condition for Ghana’s broader social and economic development in the context of colonial-era path-dependencies and Cold War competition. By taking the vantage point of mid-level administrators and professionals, the paper shows how they negotiated British and Soviet technological offers of construction materials, machinery, and design. In response to Soviet claims about the adaptability of their construction resources to Ghana’s local conditions, the practice of adaptation became for Ghanaian architects and administrators an opportunity to reflect on the needs, means, and objectives of Ghana’s construction industry, and on broader visions of Ghana’s economic and social development. Beyond the specific focus on the construction industry, this paper conceptualizes the centrality of adaptation in enforcing technological hegemony during the period of decolonization, and discusses African agency beyond the registers of extraction and resistance that have dominated scholarship on the global Cold War.
This article examines two major recent CCTV documentaries on the Third Front and its afterlives. The Big Third Front (2017) and Vicissitudes of the Third Front (2016) construct strong narratives about the Third Front during the Mao era, depicting it as a heroic struggle against nature which was forced upon China by foreign enemies. However, both documentaries encounter difficulties in adhering to the usual presentation of the Deng era as a resoundingly successful transformation. Vicissitudes ambivalently characterizes the Deng era as one of relative decline in contrast to the glorious early years of the Third Front and the flourishing present. The Big Third Front, meanwhile, conflates historical footage of the 1950s–1990s in a way that undermines the usual official division of PRC history into Mao and reform eras. This paper concludes by suggesting that academic focus on the Third Front can serve as a methodological tool for complicating the periodization of PRC history.
The camber morphing of an aerofoil in ground effect was investigated using the FishBAC method and Detached Eddy Simulations with the k-omega SST turbulence model at a Reynolds number of 320,000. The aerofoil was periodically morphed at a start location of 25% chord from the leading edge with a trailing edge deflection range of 0.1% to 3% and morphing frequencies between a Strouhal number of 0.45 to 4 at a constant ground clearance of 10%. Periodically morphing the aerofoil using a sinusoidal function showed that lift and drag increased on the downstroke and decreased on the upstroke in the cycle, resulting in periodic values of lift and drag throughout the cycle. The amplitude of lift and drag increased as the morphing frequency and/or trailing edge deflection increased. It was found that the wake characteristics varied as a function of trailing edge deflection and morphing frequency. For small trailing edge deflections below 0.4% and frequencies below a 2.2 Strouhal number, Kelvin Helmholtz shedding was observed, and above this the wake became chaotic. Large trailing edge deflections showed Von-Karman shedding, where the interaction between the lower counter-clockwise vortex and the ground plane resulted in a jet-like flow that caused forward thrust. For the maximum deflection and morphing frequency tested in this study, reversed Von-Karman shedding was observed, which caused forward thrust from the interaction of the two-shedding counter-rotating vortices. Von-Karman or reversed Von-Karman shedding shows positive thrust generation, however, chaotic shedding should be avoided due to large drag gains. Varying the Reynolds number caused the Strouhal number to change as they depend on the same variables. It was found that the Strouhal number variation had a large effect on the wake, however, the Reynolds number had a minimal effect.
Under the leadership of its founding editor, Dante Cicchetti, Development and Psychopathology has been recognized for decades as the foremost journal integrating developmental theory and clinical research programs. Contributors have often highlighted the implications of attachment theory and research for understanding developmental processes and pathways, and as a testing ground for intervention strategies. In this paper we reflect on the strengths and limitations of the traditional developmental perspective. We suggest that behavioral, cognitive, and emotional development are better understood as a process of bricolage (construction within constraints). This perspective is illustrated in an analysis of change mechanisms, and behavioral and representational changes, in attachment development from pre-locomotor infancy to later adulthood. Special emphasis is placed on ordinary learning and cognitive processes, rather than those specific to attachment, and on the roles that socialization pressures and changing circumstances play in shaping the course of attachment development.
Understanding genetic structure and chromosomal characteristics is essential for developing effective breeding programmes and improving plant species. This research compared karyotypic features of 10 plant populations of Populus euphratica from various regions of Iran. Fresh roots grown from cuttings of the populations were used to get metaphase cells. Then several chromosomal parameters were recorded and analysed using a nested statistical model. All the studied populations were diploid, with 2n = 38 chromosomes, consisting of medium and sub-medium chromosome types. Significant differences (P ⩽ 0.01) were observed between the plant populations in chromosomal dimensions and arm ratios, suggesting chromosomal rearrangements. Chromosome lengths in the studied populations ranged from 0.69 to 3.38 μm. Intra-chromosomal index (A1) showed clear asymmetrical differences between the plant populations. Furthermore, using Stebbins's standards, the studied populations classified as 1A and 1B classes, demonstrated more asymmetry than those categorized as 1B and 2B, respectively. Cytological differences between the plant populations, collected from different parts of the country, showed that chromosome structural rearrangements are responsible for the speciation and adaption of the species against the mentioned variable ecological conditions and play a key role in response to diverse climatic and geographical conditions.
The Black-cheeked Lovebird Agapornis nigrigenis has a highly restricted range in dry south-western Zambia, where its distribution is clumped and localised in association with mopane Colophospermum mopane woodland and permanent water pools. Fieldwork and monitoring over 30 months between December 2018 and October 2021 established that the lovebirds’ usage of pools for drinking was higher towards the centre of the bird’s distribution and influenced by the pools’ proximity to mopane woodlands, surrounding tree cover, and level of human activity. Of the four pool types available for use by lovebirds (i.e. mopane, grassland, river, and artificial), mopane and grassland pools were disproportionally susceptible to drying out in the dry season, hence showed greater variation in numbers of visiting birds compared with the other two types. Lovebirds showed a preference for pools with a perimeter of <50 m and tended to avoid those with a perimeter >100 m, consistent with a positive association between pool size and human activity. Convergence between humans and lovebirds in dependence on water resources and mopane woodland points to the need to find ways to overcome potential conflicts. Such ways include creating small, shallow-sided, undisturbed pools in or near mopane woodland, extending water retention in existing mopane pools, and enhancing the capacity of artificial pools to meet the needs of the lovebirds.
Climate change litigation is developing rapidly and pervasively, emerging as a space for legal innovation. Until now, this process has occurred mainly in national courts. The result is a decentralization of the interpretation of human rights relating to climate change. This article argues that such decentralization could, in principle, have a destabilizing impact on claims to the universality of human rights. However, close examination of this litigation shows that a prototype is emerging, certain features of which are becoming ‘hard wired’ through the process of judicial dialogue. By exploring the content of this prototype, its decentralized development, and its self-reinforcing nature, we see a legal space emerging in which environmental human rights sit between the universal and the contextual.
An aberrant right subclavian artery represents the most common aortic arch vascular anomaly. Conventional wisdom states that these anomalies do not result in dysphagia, but rather serve as “red herrings”. Clearly, in the vast majority of cases, this holds true. Nonetheless, one should never say never.
Methods:
Herein, we present a cohort of four children with debilitating dysphagia resulting from an aberrant right subclavian artery. Subclavian reimplantation via a right posterolateral thoracotomy was performed successfully in all cases.
Results:
Dysphagia resolved postoperatively, and all patients were able to advance to a normal diet. They were able to gain appropriate weight postoperatively and continue to do well at most recent clinical follow-up.
Conclusions:
This case series suggests that aberrant right subclavian artery anatomy should be considered a potential aetiology of dysphagia, albeit rarely. Surgical intervention for select patients can provide dramatic resolution of symptoms.