Towards a first principles description of phonons in Ni50_{50}Pt50_{50} disordered alloys: the role of relaxation

Using a combination of density-functional perturbation theory and the itinerant coherent potential approximation, we study the effects of atomic relaxation on the inelastic incoherent neutron scattering cross sections of disordered Ni$_{50}$Pt$_{50}$ alloys. We build on previous work, where empirical force constants were adjusted {\it ad hoc} to agree with experiment. After first relaxing all structural parameters within the local-density approximation for ordered NiPt compounds, density-functional perturbation theory is then used to compute phonon spectra, densities of states, and the force constants. The resulting nearest-neighbor force constants are first compared to those of other ordered structures of different stoichiometry, and then used to generate the inelastic scattering cross sections within the itinerant coherent potential approximation. We find that structural relaxation substantially affects the computed force constants and resulting inelastic cross sections, and that the effect is much more pronounced in random alloys than in ordered alloys.Comment: 8 pages, 3 eps figures, uses revtex

Pediatric diabetes training for healthcare professionals in Europe: Time for change.

BACKGROUND: Training for healthcare professionals (HCPs) in Europe who care for children and young people (CYP) with type 1 diabetes and their families is variable depending on the country. Building on the work of SWEET (Better control in Pediatric and Adolescent diabeteS: Working to crEate CEnTers of Reference) and using the German Certified Diabetes Educators (CDEs) curriculum, a European collaboration of pediatric diabetes experts aimed to (1) establish current core elements that should be included in a pediatric diabetes education training course and (2) create a template for a European CDE's training curriculum. METHODS: A qualitative methodology incorporating a survey questionnaire, focus group discussions, individual semi-structured interviews and workshops was employed to explore participants' experiences and opinions. HCPs-pediatric consultants, diabetes nurses, dietitians and psychologists, national and local diabetes leads, academic and education leads and children, and young people with diabetes and families took part in the study. The total number of participants equaled 186. RESULTS: A template for a European Certified Diabetes Educator Curriculum (EU-CDEC) was developed based on the themes that emerged from the participants' expertise and experiences. This provides a model for HCPs' pediatric diabetes training provision. CONCLUSIONS: There is a severe shortage of high quality, standardized training for HCPs across the majority of European countries. Lack of trained HCPs for CYP with diabetes will result in the delivery of suboptimal care and impact on health, wellbeing and clinical and psychological outcomes. The EU-CDEC template can be used to increase access to high quality training provision for all HCPs across Europe and worldwide

Phonons in random alloys: the itinerant coherent-potential approximation

We present the itinerant coherent-potential approximation(ICPA), an analytic, translationally invariant and tractable form of augmented-space-based, multiple-scattering theory in a single-site approximation for harmonic phonons in realistic random binary alloys with mass and force-constant disorder. We provide expressions for quantities needed for comparison with experimental structure factors such as partial and average spectral functions and derive the sum rules associated with them. Numerical results are presented for Ni_{55} Pd_{45} and Ni_{50} Pt_{50} alloys which serve as test cases, the former for weak force-constant disorder and the latter for strong. We present results on dispersion curves and disorder-induced widths. Direct comparisons with the single-site coherent potential approximation(CPA) and experiment are made which provide insight into the physics of force-constant changes in random alloys. The CPA accounts well for the weak force-constant disorder case but fails for strong force-constant disorder where the ICPA succeeds.Comment: 19 pages, 12 eps figures, uses RevTex

Metaphors we die by? Geoengineering, metaphors and the argument from catastrophe

Geoeengineering the climate by reflecting sunlight or extracting carbon dioxide from the atmosphere has attracted increasing attention from natural scientists, social scientists, policy makers and the media. This article examines promotional discourse related to geoengineering from the 1980s to 2010. It asks in particular how this option for dealing with the problems posed by climate change were framed through the use of conceptual and discourse metaphors and whether one can argue that these are metaphors we ‘live by’ or metaphors we might ‘die by’. Findings show that an overarching argument from catastrophe was bolstered by three conceptual master-metaphors, namely The Planet is a body, The Planet is a machine and The planet is a patient/addict, linked to a variety of discourse metaphors, older conceptual metaphors and clichés. This metaphorical landscape began to shift while the article was being written and will have to be closely monitored in the future

Diabetes self-management arrangements in Europe: a realist review to facilitate a project implemented in six countries

Background: Self-management of long term conditions can promote quality of life whilst delivering benefits to the financing of health care systems. However, rarely are the meso-level influences, likely to be of direct relevance to these desired outcomes, systematically explored. No specific international guidelines exist suggesting the features of the most appropriate structure and organisation of health care systems within which to situate self-management approaches and practices. This review aimed to identify the quantitative literature with regard to diabetes self-management arrangements currently in place within the health care systems of six countries (The United Kingdom, The Netherlands, Norway, Spain, Bulgaria, and Greece) and explore how these are integrated into the broader health care and welfare systems in each country. Methods: The methodology for a realist review was followed. Publications of interest dating from 2000 to 2013 were identified through appropriate MeSH terms by a systematic search in six bibliographic databases. A search diary was maintained and the studies were assessed for their quality and risk of bias. Results: Following the multi-step search strategy, 56 studies were included in the final review (the majority from the UK) reporting design methods and findings on 21 interventions and programmes for diabetes and chronic disease self-management. Most (11/21, 52%) of the interventions were designed to fit within the context of primary care. The majority (11/21, 52%) highlighted behavioural change as an important goal. Finally, some (5/21, 24%) referred explicitly to Internet-based tools. Conclusions: This review is based on results which are derived from a total of at least 5,500 individuals residing in the six participating countries. It indicates a policy shift towards patient-centred self-management of diabetes in a primary care context. The professional role of diabetes specialist nurses, the need for multidisciplinary approaches and a focus on patient education emerge as fundamental principles in the design of relevant programmes. Socio-economic circumstances are relevant to the capacity to self-manage and suggest that any gains and progress will be hard to maintain during economic austerity. This realist review should be interpreted within the wider context of a whole systems approach regarding self-care support and chronic illness management

How to propose an action as objectively necessary: The case of Polish Trzeba x ("One needs to x")

The present study demonstrates that language-specific grammatical resources can afford speakers language-specific ways of organizing cooperative practical action. On the basis of video recordings of Polish families in their homes, we describe action affordances of the Polish impersonal modal declarative construction trzeba x (“one needs to x”) in the accomplishment of everyday domestic activities, such as cutting bread, bringing recalcitrant children back to the dinner table, or making phone calls. Trzeba-x turns in first position are regularly chosen by speakers to point to a possible action as an evident necessity for the furthering of some broader ongoing activity. Such turns in first position provide an environment in which recipients can enact shared responsibility by actively involving themselves in the relevant action. Treating the necessity as not restricted to any particular subject, aligning responsive actions are oriented to when the relevant action will be done, not whether it will be done. We show that such sequences are absent from English interactions by analyzing (a) grammatically similar turn formats in English interaction (“we need to x,” “the x needs to y”), and (b) similar interactive environments in English interactions. We discuss the potential of this research to point to a new avenue for researchers interested in the relationship between language diversity and diversity in human action and cognition

Metaphorizing violence in the UK and Brazil: a contrastive discourse dynamics study

As part of a project investigating responses to uncertainty produced by violence and conflict, the use of metaphor in talk about violence in everyday life is compared across the contexts of terrorism in the UK and urban violence in Brazil. Data come from two studies. The UK study (n = 96) was carried out in 2006, following the July 2005 London bombings. The smaller Brazil study (n = 11) was carried out in 2010 in the north-eastern Brazilian city of Fortaleza which, like many Brazilian cities, has a high level of urban violence, including muggings, kidnappings and street robberies. Participants met in focus groups with a moderator and responded to a series of questions about how terrorism had changed their perceptions of risk, the decisions they made in their daily lives and their attitudes to other social groups. Recordings were transcribed and, in the second study, translated from Brazilian Portuguese into English for a bi-lingual analysis. Metaphor-led discourse analysis (Cameron et al, 2009) identified verbal metaphor vehicles produced when discussing issues around violence. Verbal metaphors were grouped into systematic metaphors. Comparisons were made of metaphor vehicles and of systematic metaphors. Findings show 16 vehicle groupings used with similar frequencies; 15 vehicle groupings used more than twice as often in UK data; and 14 vehicle groupings used more than twice as often in Brazil data. Qualitative analysis shows how the different contexts, cultures, and types of violence are reflected in, and constructed through, use of metaphor

"The post-antibiotic apocalypse" and the "war on superbugs": catastrophe discourse in microbiology, its rhetorical form and political function

Discourses evoking an antibiotic apocalypse and a war on superbugs are emerging just at a time when so-called "catastrophe discourses" are undergoing critical and reflexive scrutiny in the context of global warming and climate change. This article combines insights from social science research into climate change discourses with applied metaphor research based on recent advances in cognitive linguistics, especially with relation to "discourse metaphors." It traces the emergence of a new apocalyptic discourse in microbiology and health care, examines its rhetorical and political function and discusses its advantages and disadvantages. It contains a reply by the author of the central discourse metaphor, "the post-antibiotic apocalypse," examined in the article

Carbon gold rush and carbon cowboys: a new chapter in green mythology?

Individual and collective efforts to mitigate climate change in the form of carbon offsetting and emissions trading schemes have recently become the focus of much media attention. In this paper we explore a subset of the UK national press coverage centered on such schemes. The articles, selected from general as well as specialized business and finance newspapers, make use of gold rush, Wild West and cowboy imagery which is rooted in deeply entrenched myths and metaphors and allows readers to make sense of very complex environmental, political, ethical, and financial issues associated with carbon mitigation. They make what appears complicated and unfamiliar, namely carbon trading and offsetting, seem less complex and more familiar. A critical discussion of this type of imagery is necessary in order to uncover and question tacit assumptions and connotations which are built into it and which might otherwise go unnoticed and unchallenged in environmental communication