12508 research outputs found
Sort by
Does carbon price uncertainty affect stock price crash risk? Evidence from China
No full textYesThis study examines the effect of carbon price uncertainty on stock price crash risk. Utilizing the dynamic panel model on the data of Chinese listed firms from 2011 to 2018, we find that high carbon price uncertainty increases stock price crash risk. The impact of carbon price uncertainty is more prominent in the heavily polluting industries and during the post-period of the Paris agreement. The two underlying channels through which carbon price uncertainty induces stock price crashes are managers' hoarding of bad news and investors' heterogeneity. Furthermore, reducing information asymmetry inside and outside the firms can mitigate the influence of carbon price uncertainty on stock price crash risk. Our findings demonstrate that carbon price uncertainty as a newly underexplored factor induced by the prevailing curb of catastrophe risks has unintended but important implications on stock prices.This study was supported by the Project of Social Science Achievement Evaluation Committee of Hunan Province (Grant No. XSP22YBZ160), Hunan Provincial Natural Science Foundation of China (Grant No. 2022JJ40644 and No. 2022JJ40647)
Frontline health care workers' mental health and well-being during the first year of the COVID-19 Pandemic: Analysis of interviews and social media data
Get PDFYesThe COVID-19 pandemic has shed light on fractures in health care systems worldwide and continues to have a significant impact, particularly in relation to the health care workforce. Frontline staff have been exposed to unprecedented strain, and delivering care during the pandemic has affected their safety, mental health, and well-being.
This study aimed to explore the experiences of health care workers (HCWs) delivering care in the United Kingdom during the COVID-19 pandemic to understand their well-being needs, experiences, and strategies used to maintain well-being (at individual and organizational levels).
We analyzed 94 telephone interviews with HCWs and 2000 tweets about HCWs' mental health during the first year of the COVID-19 pandemic.
The results were grouped under 6 themes: redeployment, clinical work, and sense of duty; well-being support and HCW's coping strategies; negative mental health effects; organizational support; social network and support; and public and government support.
These findings demonstrate the need for open conversations, where staff's well-being needs and the strategies they adopted can be shared and encouraged, rather than implementing top-down psychological interventions alone. At the macro level, the findings also highlighted the impact on HCW's well-being of public and government support as well as the need to ensure protection through personal protective equipment, testing, and vaccines for frontline workers
Ultra-quantum coherent states in a single finite quantum system
No full textYesA set of n coherent states is introduced in a quantum system with d-dimensional Hilbert space H(d). It is shown that they resolve the identity, and also have a discrete isotropy property. A finite cyclic group acts on the set of these coherent states, and partitions it into orbits. A n-tuple representation of arbitrary states in H(d), analogous to the Bargmann representation, is defined. There are two other important properties of these coherent states which make them ‘ultra-quantum’. The first property is related to the Grothendieck formalism which studies the ‘edge’ of the Hilbert space and quantum formalisms. Roughly speaking the Grothendieck theorem considers a ‘classical’ quadratic form C that uses complex numbers in the unit disc, and a ‘quantum’ quadratic form Q that uses vectors in the unit ball of the Hilbert space. It shows that if C ≤ 1, the corresponding Q might take values greater than 1, up to the complex
rothendieck constant kG. Q related to these coherent states is shown to take values in the ‘Grothendieck region’ (1, kG), which is classically forbidden in the sense that C does not take values in it. The second property complements this, showing that these coherent states violate logical Bell-like inequalities (which for a single quantum system are quantum versions of the Frechet probabilistic inequalities). In this sense also, our coherent states are deep into the quantum region
Young carers’ needs and changing experiences during an era of austerity
Get PDFYesMany children caring for ill or disabled family members remain ‘hidden’ and ‘invisible’ in our communities. This study is the first to explore patterns of change, over time and throughout austerity, for children with caregiving roles to better understand how their lives differ from those of their non-caregiving peers. A survey of 2154 children, aged 9–18 years in the general population, and a further 21 children, aged 8–18 years and known to be young carers from the same English unitary authority, was conducted to gain an in-depth understanding of children’s perceptions and experiences of what they do to help at home. This study shows that children with caregiving roles remain a distinctive group who assume more domestic and caring responsibilities than their peers, and who also perform many of these activities more frequently than young caregivers in 2001. Approximately 19% of the respondents in the general population showed signs of being in a caring role, double the percentage identified by the author in 2001, 72% of whom were from Black and Minority Ethnic backgrounds. Indicating over time higher levels of unmet needs among parents and other family members who are ill or disabled, these findings have important implications for professional policy, planning and practice across adult and children’s services
Process simulation of twin-screw granulator: The effect of screw configuration on size distribution
Get PDFYesThe effect of screw configuration on granule size distribution (GSD) using gPROMS FormulatedProduct (gFP) software to perform optimization, estimation of complex processes, and analyses is evaluated. Twin-screw granulation modeling was used to investigate the contribution of screw configuration and liquid-to-solid (L/S) ratio on GSD. Lactose and Avicel were the granulating materials. Twelve different configurations were investigated under three feed rates as consistent with literature and at various L/S ratios. Results indicate that kneading elements promote the recovery of 100–1000 µm granules while reducing the production of oversized granules. Higher feed rates support the production of fines and agglomerates, while a low feed rate produces 100–1000 µm granules.Ghana Scholarship Secretaria
A review of the configurations, capabilities, and cutting-edge options for multistage solar stills in water desalination
Get PDFYesThe desalination of saltwater is a viable option to produce freshwater. All the desalination processes are energy-intensive and can be carried out on a large scale. Therefore, producing freshwater using renewable energy sources is the most desirable option considering the current energy crisis and the effect that fossil-fuel-based energy has on our carbon footprint. In this respect, the tray-type still, one of several solar power desalination still varieties, is popular owing to its straightforward design, economic materials of construction, and minimal maintenance requirements, especially in isolated island regions with restricted energy and natural water supplies. The traditional tray-type solar power has a few drawbacks, such as the inability to recover latent heat from condensation, reduced thermal convection, a large heat capacity, and comparatively minimal driving power through evaporation. Therefore, the improvement of heat and mass transfer capabilities in tray-type stills has been the subject of many studies. However, there is a lack of a comprehensive review in the open literature that covers the design and operational details of multistage solar stills. The purpose of this paper is to present a thorough overview of the past research on multistage solar stills, in terms of configurations, capabilities, and cutting-edge options. In comparison to a unit without a salt-blocking formation, the review indicates that a multistage distillation unit may run continuously at high radiation and generate pure water that is around 1.7 times higher than a unit without a salt-blocking formation. The most effective deign is found to be “V”-shaped solar still trays that attach to four-stage stills, since they are less expensive and more economical than the “floor” (Λ-shape) design, which requires two collectors. Additionally, it can be stated that the unit thermal efficiency, solar percentage, and collected solar energy (over the course of a year) increase by 23%, 18%, and 24%, respectively, when the solar collectors are increased by 26% (at the constant inflow velocity of the water)
Functional Magnetic Nanoparticles for Protein Delivery Applications: Understanding Protein-Nanoparticle interactions
No full textYesIron oxide nanoparticles (IONPs) surface functionalised with thermo-responsive polymers can encapsulate therapeutic proteins and release them upon heating with an alternating magnetic field above the lower critical solution temperature (LCST). In order to make this delivery system clinically-relevant, we prepared IONPs coated with poly-N-isopropylmethacrylamide (PNIPMAM), a polymer with LCST above human body temperature. The optimal polymer chain length and nanoparticle size to achieve LCST of ca. 45 °C were 19 kDa PNIPMAM and 16 nm IONPs. The PNIPMAM-coated IONPs could encapsulate a range of proteins which were released upon heating above LCST in the presence of a competitor protein or serum. A small amount of encapsulated protein leakage was observed below LCST. The efficiency of protein encapsulation and release was correlated with molecular weight and glycosylation state of the proteins. Magnetic heating resulted in a faster protein release as compared to conventional heating without significant temperature increase of the bulk solution.University of York and Wild Fun
Understanding Disability and Physical Impairment in Early Medieval England: an Integration of Osteoarchaeological and Funerary Evidence
Get PDFYesTHIS PAPER INVESTIGATES physical impairment and disability in the c 5th to 6th centuries ad in England through a combination of osteological and funerary analyses. A total of 1,261 individuals, 33 of whom had osteologically identifiable physical impairment, from nine early medieval cemeteries were included. The funerary data for all individuals in each cemetery was collected, and the individuals with physical impairment were analysed palaeopathologically. The burial treatment of individuals with and without physical impairment was compared both quantitatively and qualitatively, and patterns within and between cemeteries were explored to investigate contemporary perceptions and understandings of impairment and disability. The results suggest that some people with physical impairment and potential disability were buried with treatment that was arguably positive, while others were buried with treatment that was either normative or potentially negative. This suggests that, in the same way as the rest of the community, individuals with physical impairment and potential disability had a variety of identities (that may or may not have been influenced by their impairment or disability) and could occupy different social spaces/statuses
The Effects of Vaporisation Models on the FCC Riser Reactor
Get PDFYesThis work presents a steady-state one-dimensional model of the FCC riser considering the vaporisation of the gas oil feed and subsequent cracking reactions. The evaporation of droplets is studied using three models: the classical homogeneous model and the heterogeneous vaporisation models from the literature. Droplets are modelled using the Lagrangian framework model for particles moving through a fluid. This was coupled with the gas–solid flow field describing the catalyst particulate transport in the riser. Cracking reaction kinetics are modelled using a four-lumped model. The model was then validated against published plant data. The model performed well in terms of gas oil conversion, gasoline yield, pressure drop, and phase temperature profiles. Therefore, it is suitable for use in the design and optimisation of new and existing FCC unit risers, particularly in cost–benefit analysis considering the current push away from petroleum energy sources. It was found that vaporisation models are largely insignificant in terms of gas oil conversion profiles and gasoline yield for usual operation conditions of FCC risers, which is a finding that had yet to be proven in the literature. Vaporisation models are shown to only affect conversion and yield when the initial droplet exceeds 2000 μm