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We develop a new method suitable for establishing lower bounds on the ball measure of noncompactness of operators acting between considerably general quasinormed function spaces. This new method removes some of the restrictions oft-presented in the previous work. Most notably, the target function space need not be disjointly superadditive nor equipped with a norm. Instead, a property that is far more often at our disposal is exploited—namely the absolute continuity of the target quasinorm.
We use this new method to prove that limiting Sobolev embeddings into spaces of Brezis–Wainger type are so-called maximally noncompact, i.e. their ball measure of noncompactness is the worst possible.
Sleep is vital for the maintenance of physical and mental health, recovery and performance in athletes. Sleep also has a restorative effect on the immune system and the endocrine system. Sleep must be of adequate duration, timing and quality to promote recovery following training and competition. Inadequate sleep adversely impacts carbohydrate metabolism, appetite, energy intake and protein synthesis affecting recovery from the energy demands of daily living and training/competition related fatigue. Sleep’s role in overall health and well-being has been established. Athletes have high sleep needs and are particularly vulnerable to sleep difficulties due to high training and competition demands, as such the implementation of the potential nutritional interventions to improve sleep duration and quality is commonplace. The use of certain nutrition strategies and supplements has an evidence base i.e. carbohydrate, caffeine, creatine, kiwifruit, magnesium, meal make-up and timing, protein and tart cherry. However, further research involving both foods and supplements is necessary to clarify the interactions between nutrition and the circadian system as there is potential to improve sleep and recovery. Additional research is necessary to clarify guidelines and develop products and protocols for foods and supplements to benefit athlete health, performance and/or recovery. The purpose of this review is to highlight the potential interaction between sleep and nutrition for athletes and how these interactions might benefit sleep and/or recovery.
It is estimated that more than one-tenth of adults aged ≥60 years are now classified as having sarcopenic obesity (SO), a clinical condition characterised by the concurrent presence of sarcopenia (low muscle mass and weakness) and obesity (excessive fat mass). Independently, sarcopenia and obesity are associated with a high risk of numerous adverse health outcomes including CVD and neurological conditions (e.g. dementia), but SO may confer a greater risk, exceeding either condition alone. This imposes a substantial burden on individuals, healthcare systems and society. In recent years, an increasing number of observational studies have explored the association between SO and the risk of CVD; however, results are mixed. Moreover, the pathophysiology of SO is governed by a complex interplay of multiple mechanisms including insulin resistance, inflammation, oxidative stress, hormonal shifts and alteration of energy balance, which may also play a role in the occurrence of various CVD. Yet, the exact mechanisms underlying the pathological connection between these two complex conditions remain largely unexplored. The aim of this review is to examine the association between SO and CVD. Specifically, we seek to: (1) discuss the definition, epidemiology and diagnosis of SO; (2) reconcile previously inconsistent findings by synthesising evidence from longitudinal studies on the epidemiological link between SO and CVD and (3) discuss critical mechanisms that may elucidate the complex and potentially bidirectional relationships between SO and CVD.
In the present article, we study compact complex manifolds admitting a Hermitian metric which is strong Kähler with torsion (SKT) and Calabi–Yau with torsion (CYT) and whose Bismut torsion is parallel. We first obtain a characterization of the universal cover of such manifolds as a product of a Kähler Ricci-flat manifold with a Bismut flat one. Then, using a mapping torus construction, we provide non-Bismut flat examples. The existence of generalized Kähler structures is also investigated.
I raise some questions about Jeremy Fantl's The Limitations of the Open Mind. I ask what type of applied epistemology Fantl's book represents, whether there might be a better conception of open-mindedness than the one he embraces, and whether he is correct that someone's being an amateur makes it easier for their knowledge to survive the dismissal of relevant counterarguments.
The United Nations International Labour Organization (ILO) has recently incorporated driver pay into its guidelines on the promotion of safe and decent work in road transport. ILO guideline 73 states that ‘the remuneration of … CMV [commercial motor vehicle] drivers should be sustainable and take into consideration the attractiveness and sustainability of the industry’. In the spirit of this, we explore the relationship between truck drivers’ relative income and intrastate motor carrier safety performance. We utilise the United States (US) Bureau of Labor Statistics Occupational Employment and Wage data for heavy and tractor-trailer truck driver median annual incomes and the US Census Bureau’s American Community Survey estimates of median household incomes to construct county level relative income ratios for truck drivers. This information is merged with public safety data to analyse the relationship between truck drivers’ relative pay and motor carrier safety performance. We find that, all else constant, carriers located in counties where driver earnings are relatively high tend to experience fewer crashes. This provides evidence that safety performance is better when driver pay is more attractive in the truck driver labour market and, consequently, validates the ILO’s assertion under guideline 73.
Law & Society scholars often dismiss Law & Economics (L&E) as insoluble with our core beliefs about distributive justice, culture, and social solidarity. This reaction has yielded missed opportunities for new theory emergent between the fields. One such opportunity came in 1978, when Guido Calabresi and Philip Bobbitt argued that societies make “tragic choices” about scarce resource allocations so as to reconcile such choices with core culture, ethics, and values. In Calabresi’s later words, their book was a “more or less explicit appeal to anthropology for help.”1 Today, sociolegal studies remain well-poised to answer this appeal. Taking theory about moral costs from Calabresi in L&E and adding anthropological thought on the meaning of “value,” this essay presents situated valuation – a contextualized notion of value that accounts for the moral costs of inequalities while supporting principled scrutiny of redistributive policies meant to reduce inequality but sometimes worsening it. This discussion highlights the importance of interpretive social science in the study of distributive inequality, while showcasing a neglected but generative link between mutually imbricated interdisciplinary communities.
Erdös and Selfridge first showed that the product of consecutive integers cannot be a perfect power. Later, this result was generalized to polynomial values by various authors. They demonstrated that the product of consecutive polynomial values cannot be the perfect power for a suitable polynomial. In this article, we consider a related problem to the product of consecutive integers. We consider all sequences of polynomial values from a given interval whose products are almost perfect powers. We study the size of these powers and give an asymptotic result. We also define a group theoretic invariant, which is a natural generalization of the Davenport constant. We provide a non-trivial upper bound of this group theoretic invariant.
The animal protection movement has developed an increasingly close working relationship with the criminal punishment system through lobbying and campaigning for harsher punishments for animal abuse, while at the same time showing an interest in restorative justice (RJ) as a response to harm against animals. In this article, we take a critical position aligned with anti-carceral feminists and prison abolitionists against the carceral systems that fail humans and animals in circumstances of violence. We consider the potential of RJ as an alternative approach to address and prevent harm against animals in abuse cases on an individual level while highlighting the limitations of RJ in achieving the necessary changes on a societal level to end structurally produced violence against animals, such as industrial animal exploitation. We propose that transformative justice (TJ), which involves some RJ processes, is the most promising approach that could achieve justice for both humans and nonhumans in the long term without reproducing traumas and violence for the individuals and communities involved in harm reduction and prevention. Drawing on examples of RJ and TJ as developed and practised in marginalized human communities, we apply their lessons to thinking through similar practices in the context of animal abuse and neglect.
Negative relationships between the parental age and offspring life history traits have been widely observed across diverse animal taxa. However, there is a lack of studies examining the influence of parental age on offspring performance using mites, particularly phytoseiid predators as subjects. This study explored the influence of maternal age on offspring life history traits in Amblyseius herbicolus (Chant) (Acari: Mesostigmata), a phytoseiid predatory mite reproducing through thelytokous parthenogenesis. We hypothesised that increased maternal age negatively impacts offspring traits, including developmental duration, body size, fecundity and lifespan. Amblyseius herbicolus was reared under controlled laboratory conditions, and the life history traits of offspring from mothers of varying ages were analysed using linear mixed-effect models. Our results showed that the increase in maternal age significantly reduced individual egg volume, but did not significantly affect offspring developmental duration, body size, fecundity or lifespan. These findings indicate that while older A. herbicolus females produced smaller eggs, the subsequent performance (i.e. body size, fecundity and lifespan) of offspring remained largely unaffected, suggesting possible compensatory mechanisms in the offspring or alternative maternal provisioning strategies. The results of this study offer useful insights into the reproductive strategies of phytoseiid predators and asexually reproducing species, enhancing our understanding of how maternal age affects offspring fitness. Further studies can examine how offspring of A. herbicolus from mothers of different ages perform under adverse environmental conditions.
Experiments on the Richtmyer–Meshkov instability (RMI) in a dual driver vertical shock tube (DDVST) are described. An initially planar, stably stratified membraneless interface is formed by flowing air from above and sulfur hexafluoride from below the interface location using the method of Jones & Jacobs (Phys. Fluids, vol. 9, issue 1997, 1997, pp. 3078–3085). A random three-dimensional, multi-modal initial perturbation is imposed by vertically oscillating the gas column to produce Faraday waves. The DDVST design generates two shock waves, one originating above and one below the interface, with these shocks having independently controllable strengths and interface arrival times. The shock waves have nominal strengths of $M_L=1.17$ and $M_H=1.18$ for the shock wave originating in the light and heavy gas, respectively, with these strengths chosen to result in arrested bulk interface motion following reshock. The influence of the length of the shock-to-reshock time, as well as the order of shock arrival, on the post-reshock RMI is examined. The mixing layer width grows according to $h\propto t^\theta$, where $\theta _H=0.36\pm 0.018$ (95 %) and $\theta _L=0.38\pm 0.02$ (95 %) for heavy and light shock first experiments, respectively, indicating no strong dependence on the order of shock wave arrival. Volume integrated specific turbulent kinetic energy (TKE) in the mixing layer versus time is found to decay according to $E_{tot}/\bar {\rho }\propto t^p$ with $p_H=-0.823\pm 0.06$ (95 %) and $p_L=-1.061\pm 0.032$ (95 %) for heavy and light shock first experiments, respectively. Notably, the 95 % confidence intervals do not overlap. Analysis on the influence of the shock-to-reshock time on turbulent length scales, transition criteria, spectra and mixing layer anisotropy are also presented.
Human oocyte maturation is a lengthy process that takes place over the course of which oocytes gain the inherent ability to support the next developmental stages in a progressive manner. This process includes intricate and distinct events related to nuclear and cytoplasmic maturation. Nuclear maturation includes mostly chromosome segregation, whereas rearrangement of organelles, storage of mRNAs and transcription factors occur during cytoplasmic maturation.
Human oocyte maturation, both in vivo and in vitro, occurs through a process that is not yet fully understood. However, it is believed that the second messenger, cyclic adenosine monophosphate (cAMP), plays a pivotal role in the upkeep of the meiotic blocking of the human oocyte. Relatively high levels of cAMP in the human oocyte are required to maintain meiosis blocked, whereas lower levels of cAMP in the oocyte enable meiosis to resume. Oocyte cAMP concentration is controlled by a balance between adenylate cyclase and phosphodiesterases, the enzymes responsible for cAMP generation and breakdown.
In addition to nuclear maturation, the female gamete requires a number of complicated structural and biochemical modifications in the cytoplasmic compartment to be able to fertilize normally. According to ultrastructural studies, during the transition from the germinal vesicle stage to metaphase II (MII), several organelles reorganize their positions. The cytoskeletal microfilaments and microtubules found in the cytoplasm facilitate these movements and regulate chromosomal segregation.
The aim of this review is to focus on the nuclear and cytoplasmic maturation by investigating the changes that take place in the process of oocytes being competent for development.
One kind of good listener aspires to be sensitive to the testimony of injustice. Under conditions of oppression, this testimony is silenced. One cause of the silencing is that a dominant rights-based model of distributive justice interferes with our appreciation of a needs-based model of radically egalitarian justice. Another cause is that ambient prejudices threaten to impair the listener. A good listener is not only an individual but also a social animal, one who needs to engage with others in a dialectic of attention in order to undo their own prejudices.
We introduce the concept of ‘irrational paths’ for a given subshift and useit to characterize all minimal left ideals in the associated unital subshift algebra. Consequently, we characterize the socle as the sum of the ideals generated by irrational paths. Proceeding, we construct a graph such that the Leavitt path algebra of this graph is graded isomorphic to the socle. This realization allows us to show that the graded structure of the socle serves as an invariant for the conjugacy of Ott–Tomforde–Willis subshifts and for the isometric conjugacy of subshifts constructed with the product topology. Additionally, we establish that the socle of the unital subshift algebra is contained in the socle of the corresponding unital subshift C*-algebra.
I defend a referential anti-realist solution to the problem of intentional identity. I develop Nathan Salmon's referential realist solution to the problem — according to which mythical objects exist and we can refer to them by using mythical-object names — and consider David Braun's objections to it. I argue that Salmon's solution yields the real identity, rather than the intentional identity, of the objects of multiple subjects’ thoughts. And I develop a referential anti-realist variant of Salmon's view — according to which mythical objects do not exist nor are they otherwise real but we can nevertheless refer to them — which avoids this worry.
Italy often experiences major events, such as earthquakes, floods, and migrant shipwrecks. Current and future global challenges for health workers are made up by climate change, pandemics, and wars. In this work, we will assess the state-of-art of training and interest towards these challenges among Italian post-degree public health schools.
Methods
A cross-sectional survey was conducted in Italy in June 2023 among Italian public health residents. The study investigated training levels and updates regarding emergencies in Italian residencies. It also analyzed interest and importance of topic, impact of the COVID-19 pandemic, and sources of information.
Results
Of 289 respondents, 86.2% deemed the topic important and 74.4% expressed interest. 90.1% pointed out the lack of dedicated courses and 93.1% of specialized master’s programs. Perceived importance in the topic was associated with the desire to attend dedicated conferences. As for COVID-19, 24.6% recognized the importance of this topic pre-pandemic, while 50.9% raised awareness during the pandemic.
Conclusions
This survey shows the need for the offer of emergency training programs in Italian public health schools. Professionals in public health can make a great contribution to emergencies, not only in preparedness, but also in response and recovery phases.
The articles in this volume celebrate the work of Steven Burns. Versions of the articles were presented originally at two sessions organized in Burns's honour at the 2022 meeting of the Atlantic Regional Philosophers’ Association (ARPA), held at Dalhousie University in Halifax. This introduction presents a brief academic biography and summarizes each of the contributions. The articles, by Michael Hymers, Robbie Moser and Darren Bifford, Alice MacLachlan, Jason Holt, and Warren Heiti, address perennial themes in philosophy, such as self-knowledge, attention, friendship, interpretation, and judgement. The collection concludes with some last words by Burns himself.