Characterization of InGaN and InAlN epilayers by microdiffraction X-Ray reciprocal space mapping

We report a study of InGaN and InAlN epilayers grown on GaN/Sapphire substrates by microfocused three-dimensional X-ray Reciprocal Space Mapping (RSM). The analysis of the full volume of reciprocal space, while probing samples on the microscale with a focused X-ray beam, allows us to gain uniquely valuable information about the microstructure of III-N alloy epilayers. It is found that “seed” InGaN mosaic nanocrystallites are twisted with respect to the ensemble average and strain free. This indicates that the growth of InGaN epilayers follows the Volmer-Weber mechanism with nucleation of “seeds” on strain fields generated by the a-type dislocations which are responsible for the twist of underlying GaN mosaic blocks. In the case of InAlN epilayer formation of composition gradient was observed at the beginning of the epitaxial growth

Optimal Data-Dependent Hashing for Approximate Near Neighbors

We show an optimal data-dependent hashing scheme for the approximate near neighbor problem. For an $n$-point data set in a $d$-dimensional space our data structure achieves query time $O(d n^{\rho+o(1)})$ and space $O(n^{1+\rho+o(1)} + dn)$, where $\rho=\tfrac{1}{2c^2-1}$ for the Euclidean space and approximation $c>1$. For the Hamming space, we obtain an exponent of $\rho=\tfrac{1}{2c-1}$. Our result completes the direction set forth in [AINR14] who gave a proof-of-concept that data-dependent hashing can outperform classical Locality Sensitive Hashing (LSH). In contrast to [AINR14], the new bound is not only optimal, but in fact improves over the best (optimal) LSH data structures [IM98,AI06] for all approximation factors $c>1$. From the technical perspective, we proceed by decomposing an arbitrary dataset into several subsets that are, in a certain sense, pseudo-random.Comment: 36 pages, 5 figures, an extended abstract appeared in the proceedings of the 47th ACM Symposium on Theory of Computing (STOC 2015

How public health teams navigate their different roles in alcohol premises licensing:ExILEnS multistakeholder interview finding

Background: In England and Scotland, local governments regulate the sale of alcohol by awarding licences to premises to permit the sale of alcohol for consumption on or off the premises, under certain conditions; without such a licence, alcohol cannot be legally sold. In recent years, many local public health teams have become proactive in engaging with alcohol licensing, encouraging licensing authorities to act in ways intended to improve population health. Objective: This research aimed to explore and understand the approaches and activities of public health stakeholders (i.e. NHS staff and other public health professionals) in seeking to influence local alcohol licensing policy and decisions, and the views of licensing stakeholders (i.e. licensing officers/managers, police staff with a licensing remit, elected members and licensing lawyers/clerks) on the acceptability and effectiveness of these approaches. Participants: Local public health teams in England and Scotland were directly informed about this multisite study. Scoping calls were conducted with interested teams to explore their level of activity in alcohol licensing from 2012 across several categories. Twenty local authority areas with public health teams active in licensing matters were recruited purposively in England (n = 14) and Scotland (n = 6) to vary by region and rurality. Fifty-three in-depth telephone interviews (28 with public health stakeholders and 25 with licensing stakeholders outside health, such as local authority licensing teams/lawyers or police) were conducted. Interview transcripts were analysed thematically in NVivo 12 (QSR International, Warrington, UK) using inductive and deductive approaches. Results: Public health stakeholders’ approaches to engagement varied, falling into three main (and sometimes overlapping) types. (1) Many public health stakeholders in England and all public health stakeholders in Scotland took a ‘challenging’ approach to influencing licensing decisions and policies. Reducing health harms was felt to necessitate a focus on reducing availability and generating longer-term culture change, citing international evidence on the links between availability and alcohol-related harms. Some of these stakeholders viewed this as being a narrow, ‘nanny state’ approach, whereas others welcomed public health expertise and its evidence-based approach and input. (2) Some public health stakeholders favoured a more passive, ‘supportive’ approach, with some reporting that reducing availability was unachievable. They reported that, within the constraints of current licensing systems, alcohol availability may be contained (at least in theory) but cannot be reduced, because existing businesses cannot be closed on availability grounds. In this ‘supportive’ approach, public health stakeholders supplied licensing teams with data on request or waited for guidance from licensing teams on when and how to get involved. Therefore, public health action supported the licensing team in their aim of promoting ‘safe’ and ‘responsible’ retailing of alcohol and/or focused on short-term outcomes other than health, such as crime. (3) Some public health stakeholders favoured a ‘collaborative’ approach in which they worked in close partnership with licensing teams; this could include a focus on containing availability or responsible retail of alcohol, or both. Conclusions: In engaging with alcohol licensing, public health stakeholders adapted their approaches, sometimes resulting in a diminished focus on public health goals. Sampling did not include lower-activity areas, in which experiences might differ. The extent to which current licensing systems enable achievement of public health goals is questionable and the effectiveness of public health efforts merits quantitative evaluation

Understanding the challenges of identifying, supporting, and signposting patients with alcohol use disorder in secondary care hospitals, post COVID-19: a qualitative analysis from the North East and North Cumbria, England

Abstract Background Alcohol-related mortality and morbidity increased during the COVID-19 pandemic in England, with people from lower-socioeconomic groups disproportionately affected. The North East and North Cumbria (NENC) region has high levels of deprivation and the highest rates of alcohol-related harm in England. Consequently, there is an urgent need for the implementation of evidence-based preventative approaches such as identifying people at risk of alcohol harm and providing them with appropriate support. Non-alcohol specialist secondary care clinicians could play a key role in delivering these interventions, but current implementation remains limited. In this study we aimed to explore current practices and challenges around identifying, supporting, and signposting patients with Alcohol Use Disorder (AUD) in secondary care hospitals in the NENC through the accounts of staff in the post COVID-19 context. Methods Semi-structured qualitative interviews were conducted with 30 non-alcohol specialist staff (10 doctors, 20 nurses) in eight secondary care hospitals across the NENC between June and October 2021. Data were analysed inductively and deductively to identify key codes and themes, with Normalisation Process Theory (NPT) then used to structure the findings. Results Findings were grouped using the NPT domains ‘implementation contexts’ and ‘implementation mechanisms’. The following implementation contexts were identified as key factors limiting the implementation of alcohol prevention work: poverty which has been exacerbated by COVID-19 and the prioritisation of acute presentations (negotiating capacity); structural stigma (strategic intentions); and relational stigma (reframing organisational logics). Implementation mechanisms identified as barriers were: workforce knowledge and skills (cognitive participation); the perception that other departments and roles were better placed to deliver this preventative work than their own (collective action); and the perceived futility and negative feedback cycle (reflexive monitoring). Conclusions COVID-19, has generated additional challenges to identifying, supporting, and signposting patients with AUD in secondary care hospitals in the NENC. Our interpretation suggests that implementation contexts, in particular structural stigma and growing economic disparity, are the greatest barriers to implementation of evidencebased care in this area. Thus, while some implementation mechanisms can be addressed at a local policy and practice level via improved training and support, system-wide action is needed to enable sustained delivery of preventative alcohol work in these settings

Productivity and convergence in European agriculture

In the paper we investigate relative productivity levels and decompose productivity change for European agriculture between 2004 and 2013. More specifically (1) we contribute to the debate whether agricultural Total Factor Productivity (TFP) has declined or not in the European Union (EU); (2) we compare the relative TFP level across EU member states and investigate the difference between 'old' member states (OMS, i.e. the EU-15) and 'new' member states (NMS) and (3) we test whether TFP is converging or not among member states. The empirical analysis applies the aggregate quantity framework developed in O'Donnell (2008), using country level panel data from the Economic Accounts for Agriculture for 23 EU member states. The results imply that TFP has slightly decreased in the EU over the analysed period; however there are significant differences in this respect between the OMS and NMS and across member states. Finally, our estimations support the productivity convergence hypothesis across the member states

The Scottish economy [July 1981]

The current economic situation is extremely depressed and recent events suggest that, without significant increases in economic activity, the political and social fabric of this country may be several strained. However, as argued in the UK section, the prospects for recovery are bleak and reliance on a purely financial strategy to restore growth is in itself inadequate. The source of real economic growth lies in the ability of labour, capital and enterprise to come together in a manner conducive to increased productivity over time. It is therefore worthwhile examining these factors of production to determine the effect of current policies upon them