Identifying early stage precipitation in large-scale atomistic simulations of superalloys

A method for identifying and classifying ordered phases in large chemically and thermally disordered atomistic models is presented. The method uses Steinhardt parameters to represent local atomic configurations and develops probability density functions to classify individual atoms using naïve Bayes. The method is applied to large molecular dynamics simulations of supersaturated Ni-20 at% Al solid solutions in order to identify the formation of embryonic γ'-Ni3Al. The composition and temperatures are chosen to promote precipitation, which is observed in the form of ordering and is found to occur more likely in regions with above average Al concentration producing 'clusters' of increasing size. The results are interpreted in terms of a precipitation mechanism in which the solid solution is unstable with respect to ordering and potentially followed by either spinodal decomposition or nucleation and growth.Support for this work was provided by Rolls Royce plc and EPSRC Doctoral Training Grants EP/J500380/1 and EP/K503009/1

One-dimensional half-metallic interfaces of two-dimensional honeycomb insulators

We study zigzag interfaces between insulating compounds that are isostructural to graphene, specifically II-VI, III-V, and IV-IV two-dimensional honeycomb insulators. We show that these one-dimensional interfaces are polar, with a net density of excess charge that can be simply determined by using the ideal (integer) formal valence charges, regardless of the predominant covalent character of the bonding in these materials. We justify this finding on fundamental physical grounds by analyzing the topology of the formal polarization lattice in the parent bulk materials. First-principles calculations elucidate an electronic compensation mechanism not dissimilar to oxide interfaces, which is triggered by a Zener-like charge transfer between interfaces of opposite polarity. In particular, we predict the emergence of one-dimensional electron and hole gases, which in some cases are ferromagnetic half metallic. © 2013 American Physical Society

Hidden from sight - from the closet to the paywall:A rapid evaluation of restricted and monetized access to LGBTQ+ inclusive palliative, end-of-life, and bereavement care research

Introduction: LGBTQ+ people experience higher burdens of life-limiting illnesses, poorer health outcomes, and multilevel barriers to accessing palliative, end-of-life, and bereavement care. High quality evidence is needed to inform interventions to address these inequities, and inform inclusive practices and policies. Despite global initiatives to improve availability of peer-reviewed journal articles, the minority of research is open access (OA). We aimed to evaluate accessibility of literature related to LGBTQ+ inclusive palliative, end-of-life, and bereavement care. Methods: A rapid review of the evidence regarding LGBTQ+ inclusive palliative, end-of-life, and bereavement care was conducted; OA status of identified articles was assessed. Articles from three published systematic reviews were included (2012, 2016, and 2020). Review articles were updated using the original search and inclusion/exclusion strategies. Results: 66 articles related to LGBTQ+ inclusive palliative, end-of-life and bereavement care were identified between 1990-2022. Of these, only 21% (n=14) were OA. Of the OA articles, 79% were published between 2017 and 2022, and 50% were published between 2020-2022, reflecting more recent shifts towards OA publishing. Discussion: Health and social care professionals and policy makers rely on access to high quality evidence to inform their work. Failing to make articles related to the needs of LGBTQ+ people and populations OA risks further marginalisation and worsened inequities. Innovative journal policies and funding are needed to enable access, particularly for research that foregrounds the needs of marginalised communities. Where articles are currently behind paywalls, there is a need for accessible summaries or policy briefs to inform inclusive policy and practice.</p

Invisible and intangible illness: A qualitative interview study of patients’ experiences and understandings of conservatively managed end-stage kidney disease

Background: Increasing numbers of older adults are living with kidney disease. For those with comorbidities, conservative management of end-stage kidney disease is a viable option: dialysis may afford limited or no survival benefit, and perceived burdens may outweigh benefits. Conservative management focuses on: maintaining remaining kidney function; symptom management; and quality of life. Common symptoms in conservatively managed kidney disease include: fatigue; anorexia; nausea and vomiting; pain and pruritis. Chronic disease is associated with biographical disruption and a loss of sense of self. Coping strategies are shaped by illness perceptions, but little is known of illness perceptions of people living with conservatively managed kidney disease. This study aimed to explore the experience, impact and understanding of conservatively managed end-stage kidney disease among older adults. Methods: Secondary analysis of qualitative interviews analysed using thematic analysis. Twenty people with conservatively managed end-stage kidney disease were recruited from 3 UK renal units: median age was 82 (range, 69–95); 9 women, 11 men.Results: Participants described the invisibility and intangibility of kidney disease, and challenges in attributing symptoms to the disease. They described a spectre-like presence, sapping their energy and holding them down. For some, it was hard to differentiate symptoms of the illness from characteristics of aging, resulting in challenges in illness attribution, and disconnectedness from the illness. Conclusions: Participants described challenges in attributing their symptoms to kidney disease which negatively impacted upon their wellbeing, and ability to accept an adjusted sense of self. Understanding these challenges is critical in the management conditions such as end-stage kidney disease where prognosis may be poor, and where an increase in symptom distress may suggest a marked deterioration in their condition, or a change in phase of illness. Clinical services need to recognize the illness experience (alongside more symptom led approaches), including the invisibility, intangibility, and disconnectedness, and address this through specific interventions focused on improving clinical assessment, communication and education, alongside peer and professional support

The views and experiences of older people with conservatively managed renal failure: A qualitative study of communication, information and decision-making

Background: Older people with advanced kidney disease require information and support from clinicians when deciding whether to have dialysis or conservative (non-dialysis) care. There is evidence that communication practices, information provision and treatment rates vary widely across renal units. However, experiences of communicating with clinicians among patients receiving conservative care are poorly understood. This evidence is essential to ensure support is patient-centred and equitable. Our aim was to explore views and experiences of communication, information provision and treatment decision-making among older patients receiving conservative care.Methods: In-depth qualitative interviews were conducted with patients with stage 5 chronic kidney disease from three UK renal units. Purposive sampling captured variation in age, co-morbidity and functional status. Interviews were analysed thematically.Results: 20 patients were interviewed (11 were men; median age 82 (range 69-95)). Participants described positive experiences of communicating with clinicians and receiving information, but also negative experiences involving insensitivity, rushing or ambiguity. Participants reported clinicians omitting/avoiding conversations regarding diagnosis and prognosis, and described what helped and hindered good communication and support. They wanted information about their treatment options and illness, but expressed ambivalence about knowing details of disease progression. Clinicians’ views and recommendations regarding treatment influenced patients’ decision-making.Conclusions: Older patients report variable quality in communication with clinicians and gaps in the information received. Uncertainty about the disease trajectory and patients’ ambivalence regarding information makes communication particularly challenging forclinicians. Tailoring information to patient preferences and conveying it clearly and sensitively is critical. Renal clinicians require support and training to ensure decision-making support for older patients is patient-centred. Future research should examine how clinicians’ communication practices influence treatment decision-making

Polymorphism in M(H2PO2)3 (M = V, Al, Ga) compounds with the perovskite-related ReO3 structure.

Trivalent metal hypophosphites with the general formula M(H2PO2)3 (M = V, Al, Ga) adopt the ReO3 structure, with each compound displaying two structural polymorphs. High-pressure synchrotron X-ray studies reveal a pressure-driven phase transition in Ga(H2PO2)3 that can be understood on the basis of ab initio thermodynamics

Towards person-centered quality care for children with life-limiting and life-threatening illness: self-reported symptoms, concerns and priority outcomes from a multi-country qualitative study

Abstract Background: Paediatric life-limiting and life-threatening conditionslife-limiting conditions place significant strain on children, families and health systems. Given high service use among this population, it is essential that care addresses their main symptoms and concerns. Aim: This study aimed to identify the symptoms, concerns, and other outcomes that matter to children with life-limiting conditions and their families in sub-Saharan Africa.Setting and participants: Cross-sectional qualitative study in Kenya, Namibia, South Africa and Uganda. Children/caregivers of children aged 0-17 years with life-limiting conditions were purposively sampled by age, sex, and diagnosis. Children aged 7 and above self-reported; caregiver proxies reported for children below 7 and those aged 7 and above unable to self-report.Results: 120 interviews were conducted with children with life-limiting conditions (n=61 age range 7-17 years), and where self-report was not possible caregivers (n=59) of children (age range 0-17). Conditions included advanced HIV (22%), cancer (19%), heart disease (16%) endocrine, blood and immune disorders (13%), neurological conditions (12%), sickle cell anaemia (10%) and renal disease (8%). Outcomes identified included: physical concerns – pain and symptom distress; psycho-social concerns – family and social relationships, ability to engage with age-appropriate activities (e.g., play, school attendance); existential concerns – worry about death, and loss of ambitions,health care quality– child- and adolescent-friendly services. Priority psycho-social concerns and health service factors varied by age.Conclusion: This study bridges an important knowledge gap regarding symptoms, concerns and outcomes that matter to children living with life-limiting conditions and their families and informs service development and evaluation

Ultrastructure of Deinopis egg sac (Araneae: Deinopidae)

Attacks by predators and parasitoids on spider eggs are common. To counteract their negative effect, spiders have evolved a series of behaviours and features related to their egg sacs. In the genus Deinopis (Deinopidae) the tightly woven external layer of the egg sac seems to be an effective barrier. This layer consists of two sub-layers: the outer sub-layer is constructed of thin threads densely woven with an apparently hardened liquid that cements the threads together, and an inner sub-layer that seems to be even more compact and in which threads are not discernible. Threads of the external layer are presumably produced by the cylindrical glands, but other glands may be involved in production of the liquid substance.UCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de Biologí

Microstructural Evolution in Thin Films of Electronic Materials

Contains reports on five research projects and a list of publications and theses.Joint Services Electronics Program Contract DAAL03-89-C-0001Semiconductor Research CorporationNational Science FoundationU.S. Army Research OfficeHitachi LimitedIBM Corporatio

Kidney disease pathways, options and decisions: an environmental scan of international patient decision aids

Background: Conservative management is recognized as an acceptable treatment for people with worsening chronic kidney disease; however, patients consistently report they lack understanding about their changing disease state and feel unsupported in making shared decisions about future treatment. The purpose of this review was to critically evaluate patient decision aids (PtDAs) developed to support patient–professional shared decision-making between dialysis and conservative management treatment pathways. Methods: We performed a systematic review of resources accessible in English using environmental scan methods. Data sources included online databases of research publications, repositories for clinical guidelines, research projects and PtDAs, international PtDA expert lists and reference lists from relevant publications. The resource selection was from 56 screened records; 17 PtDAs were included. A data extraction sheet was applied to all eligible resources, eliciting resource characteristics, decision architecture to boost/bias thinking, indicators of quality such as International Standards for Patient Decision Aids Standards checklist and engagement with health services. Results: PtDAs were developed in five countries; eleven were publically available via the Internet. Treatment options described were dialysis (n = 17), conservative management (n = 9) and transplant (n = 5). Eight resources signposted conservative management as an option rather than an active choice. Ten different labels across 14 resources were used to name ‘conservative management’. The readability of the resources was good. Six publications detail decision aid development and/or evaluation research. Using PtDAs improved treatment decision-making by patients. Only resources identified as PtDAs and available in English were included. Conclusions: PtDAs are used by some services to support patients choosing between dialysis options or end-of-life options. PtDAs developed to proactively support people making informed decisions between conservative management and dialysis treatments are likely to enable services to meet current best practice