Asymptotic Capture-Number and Island-Size Distributions for One-Dimensional Irreversible Submonolayer Growth

Using a set of evolution equations [J.G. Amar {\it et al}, Phys. Rev. Lett. {\bf 86}, 3092 (2001)] for the average gap-size between islands, we calculate analytically the asymptotic scaled capture-number distribution (CND) for one-dimensional irreversible submonolayer growth of point islands. The predicted asymptotic CND is in reasonably good agreement with kinetic Monte-Carlo (KMC) results and leads to a \textit{non-divergent asymptotic} scaled island-size distribution (ISD). We then show that a slight modification of our analytical form leads to an analytic expression for the asymptotic CND and a resulting asymptotic ISD which are in excellent agreement with KMC simulations. We also show that in the asymptotic limit the self-averaging property of the capture zones holds exactly while the asymptotic scaled gap distribution is equal to the scaled CND.Comment: 4 pages, 1 figure, submitted to Phys. Rev.

Supramolecular systems at liquid-solid interfaces: general discussion

status: publishe

A multi-center individual-randomized controlled trial of screening and brief alcohol intervention to prevent risky drinking in young people aged 14–15 in a high school setting

Background: Young people are a greater risk of problem drinking and are vulnerable to the effects of alcohol consumption, linked to early drinking and also the physiological and social consequences of alcohol use. The SIPS JR-HIGH study is a multicenter Randomized Controlled Trial (RCT) aiming to assess the effectiveness and cost-effectiveness of alcohol screening and brief intervention to reduce risky drinking in those aged 14–15 years in the English high school setting. Materials and methods: Thirty schools in England were recruited into the trial: 4 in London; 6 in the North West, 7 in Kent, and 13 in the North East. A baseline survey was undertaken between December 2015 and June 2016 by young people in school. Young people who screened positive for risky drinking using a single item screen (ASAQ) were allocated with equal probability to either a control arm consisting of usual school-based education on alcohol issues, or to the intervention arm augmenting usual education with a 30 min brief intervention, both delivered by school pastoral staff. At 12-month follow-up the primary outcome of total alcohol consumed is being measured using the Timeline Follow Back (TLFB). Qualitative interviews with young people, parents, and school staff supplement the main trial, by exploring the barriers and facilitators to the effectiveness and implementation of the intervention. Results: In total, 4587 young people were surveyed at baseline, with 586 randomized. So far, thirty-one (n = 109) percent of the target (n = 352) follow-up sample have completed a survey at their 12 month time point, with ongoing follow-ups continuing until June 2017. In total, 27 qualitative interviews with school staff were conducted in 2016, and interviews with young people and parents are currently being conducted. Conclusions: Of 4587 young people surveyed, 1044 young people scored positive for risky drinking, and 586 are taking part in the trial. Qualitative interviews with school staff have indicated that they see the benefit of the intervention to schools, that there is staff support for the intervention, and that is easy to undertake by school staff and to roll-out in schools should it be shown to be effective and cost-effective