Analytical solution of generalized Burton--Cabrera--Frank equations for growth and post--growth equilibration on vicinal surfaces

We investigate growth on vicinal surfaces by molecular beam epitaxy making use of a generalized Burton--Cabrera--Frank model. Our primary aim is to propose and implement a novel analytical program based on a perturbative solution of the non--linear equations describing the coupled adatom and dimer kinetics. These equations are considered as originating from a fully microscopic description that allows the step boundary conditions to be directly formulated in terms of the sticking coefficients at each step. As an example, we study the importance of diffusion barriers for adatoms hopping down descending steps (Schwoebel effect) during growth and post-growth equilibration of the surface.Comment: 16 pages, REVTeX 3.0, IC-DDV-94-00

An Exploration into the Impact of Social Networking Site (SNS) Use on Body Image and Eating Behavior of Physically Active Men

From SAGE Publishing via Jisc Publications RouterHistory: epub 2020-04-02Publication status: PublishedThe rapid proliferation of social networking sites (SNSs) has transformed the way people now socialize and communicate. SNSs have been recognized to contribute to body image (BI) dissatisfaction and disordered eating behavior (EB). Few qualitative studies have explored this issue in men. The aim of the current study was to investigate male SNS use and possible impacts on BI and EB. One-to-one semi-structured interviews were conducted with eight men in the United Kingdom. Interviews aimed to examine men’s views on the potential impact of SNSs on BI and EB. Data were thematically analyzed. Findings suggested that SNSs may be a useful nutrition idea tool and motivational platform for men to improve their diet and exercise uptake. However, results also indicated that SNS use may contribute to BI dissatisfaction and increased risk of disorder. Future research may identify risk factors of SNS use, male BI concerns, and eating pathology across the lifespan

Topographically specific effects of ELF-1 on retinal axon guidance in vitro and retinal axon mapping in vivo

Peer reviewedPublisher PD

Redistributed manufacturing in healthcare: Creating new value through disruptive innovation

The RiHN White Paper is the first serious attempt to gather expertise and to explore applications in promising areas of healthcare that could benefit from RDM and covers early-stage user needs, challenges and priorities. The UK has an opportunity to lead in this area and RiHN has identified an extensive number of areas for fruitful R&D, crossing production technology, infrastructure, business and organisations. The paper serves as a foundation for discussing future technological roadmaps and engaging the wider community and stakeholders, as well as policy makers, in addressing the potential impact of RDM.The RiHN White Paper is of particular value to policy makers and funders seeking to specify action and to direct attention where it is needed. The White Paper is also useful for the research community, to support their proposals with credible research propositions and to show where collaboration with industry and the public sector will deliver the most benefits.In order to seize the opportunities presented by RDM RiHN proposes a bold new agenda that incorporates a whole healthcare system view of future implementation pathways and wider transformation implications. The priority areas for Future R&D can be summarised as follows: throughAutomated production platform technologies and supporting manufacturing infrastructuresAdvances in analytics and metrologyNew regulatory frameworks and governance pathwaysNew frameworks for business model and organisational transformationThe time to take action is now. Technologies are developing that have the potential to disrupt traditional healthcare pathways and offer therapies tailored to individual needs and physiological characteristics. The challenge is seizing this opportunity and make the UK a world leader in RDM

Recent progress with large-scale ab initio calculations: the CONQUEST code

While the success of density functional theory (DFT) has led to its use in a wide variety of fields such as physics, chemistry, materials science and biochemistry, it has long been recognised that conventional methods are very inefficient for large complex systems, because the memory requirements scale as $N^2$ and the cpu requirements as $N^3$ (where $N$ is the number of atoms). The principles necessary to develop methods with linear scaling of the cpu and memory requirements with system size ($\mathcal{O}(N)$ methods) have been established for more than ten years, but only recently have practical codes showing this scaling for DFT started to appear. We report recent progress in the development of the \textsc{Conquest} code, which performs $\mathcal{O}(N)$ DFT calculations on parallel computers, and has a demonstrated ability to handle systems of over 10,000 atoms. The code can be run at different levels of precision, ranging from empirical tight-binding, through \textit{ab initio} tight-binding, to full \textit{ab initio}, and techniques for calculating ionic forces in a consistent way at all levels of precision will be presented. Illustrations are given of practical \textsc{Conquest} calculations in the strained Ge/Si(001) system.Comment: 12 pages, 7 figures, accepted by phys. stat. sol.

WormBase: a multi-species resource for nematode biology and genomics

WormBase (http://www.wormbase.org/) is the central data repository for information about Caenorhabditis elegans and related nematodes. As a model organism database, WormBase extends beyond the genomic sequence, integrating experimental results with extensively annotated views of the genome. The WormBase Consortium continues to expand the biological scope and utility of WormBase with the inclusion of large-scale genomic analyses, through active data and literature curation, through new analysis and visualization tools, and through refinement of the user interface. Over the past year, the nearly complete genomic sequence and comparative analyses of the closely related species Caenorhabditis briggsae have been integrated into WormBase, including gene predictions, ortholog assignments and a new synteny viewer to display the relationships between the two species. Extensive site-wide refinement of the user interface now provides quick access to the most frequently accessed resources and a consistent browsing experience across the site. Unified single-page views now provide complete summaries of commonly accessed entries like genes. These advances continue to increase the utility of WormBase for C.elegans researchers, as well as for those researchers exploring problems in functional and comparative genomics in the context of a powerful genetic system

Michael Gove’s war on professional historical expertise : conservative curriculum reform, extreme Whig history and the place of imperial heroes in modern multicultural Britain

Six years of continuously baiting his opponents within the history profession eventually amounted to little where it mattered most. UK Secretary of State for Education, Michael Gove, finally backtracked in 2013 on his plans to impose a curriculum for English schools based on a linear chronology of the achievements of British national heroes. His ‘history as celebration’ curriculum was designed to instil pride amongst students in a supposedly shared national past, but would merely have accentuated how many students in modern multicultural Britain fail to recognise themselves in what is taught in school history lessons. Now that the dust has settled on Gove’s tenure as Secretary of State, the time is right for retrospective analysis of how his plans for the history curriculum made it quite so far. How did he construct an ‘ideological’ conception of expertise which allowed him to go toe-to-toe for so long with the ‘professional’ expertise of academic historians and history teachers? What does the content of this ideological expertise tell us about the politics of race within Conservative Party curriculum reforms? This article answers these questions to characterise Gove as a ‘whig historian’ of a wilfully extreme nature in his attachment to imperial heroes as the best way to teach national history in modern multicultural Britain