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Observation of oxygen dimers via energy transfer from silicon nanoparticles
No full textPublication abstract:
Energy transfer from photo-excited excitons confined in silicon nanoparticles to oxygen dimers adsorbed on the nanoparticle surfaces is studied as a function of temperature and magnetic field. Quenching features in the nanoparticle photoluminescence spectrum arise from energy transfer to the oxygen dimers with and without the emission of Si TO(Δ) phonons and, also, with and without the vibrational excitation of the dimers. The dependence of the quenching on magnetic field shows that energy transfer is fast when a dimer is present, allowing an estimate of the proportion of the nanoparticles with adsorbed dimers.
This dataset contains raw data contributing to all figures in this publication.Full methodology is described in the associated publication. For a textbook introduction to the field, see M. J. Sailor "Porous Silicon in Practice", Wiley 2012
Participant transcripts for “The understanding and interpretation of innovative technology-enabled multidimensional physical activity feedback in patients at risk of future chronic disease"
No full textBackground: Innovative physical activity monitoring technology can be used to depict rich visual feedback that encompasses the various aspects of physical activity known to be important for health. However, it is unknown whether patients who are at risk of chronic disease would understand such sophisticated personalised feedback or whether they would find it useful and motivating. The purpose of the present study was to determine whether technology-enabled multidimensional physical activity graphics and visualisations are comprehensible and usable for patients at risk of chronic disease.
Method: We developed several iterations of graphics depicting minute-by-minute activity patterns and integrated physical activity health targets. Subsequently, patients at moderate/high risk of chronic disease (n=29) and healthcare practitioners (n=15) from South West England underwent full 7-days activity monitoring followed by individual semi-structured interviews in which they were asked to comment on their own personalised visual feedback Framework analysis was used to gauge their interpretation and of personalised feedback, graphics and visualisations.
Results: We identified two main components focussing on (a) the interpretation of feedback designs and data and (b) the impact of personalised visual physical activity feedback on facilitation of health behaviour change. Participants demonstrated a clear ability to understand the sophisticated personal information plus an enhanced physical activity knowledge. They reported that receiving multidimensional feedback was motivating and could be usefully applied to facilitate their efforts in becoming more physically active.
Conclusion: Multidimensional physical activity feedback can be made comprehensible, informative and motivational by using appropriate graphics and visualisations. There is an opportunity to exploit the full potential created by technological innovation and provide sophisticated personalised physical activity feedback as an adjunct to support behaviour change.We worked with professional infographics specialists to develop multidimensional physical activity visualisations and then evaluated whether patients and healthcare professionals could comprehend these designs and personal feedback on their physical activity and whether they subsequently found this information useful through qualitative, one-to-one, semi-structured interviews.Digital audio files were transcribed verbatim and any primary or secondary identifiers were removed from the word documents to comply with data protection and confidentiality regulations
Training materials and participant handouts for "Multidimensional individualised physical activity (Mi-PACT): a technology-enabled randomised controlled trial to promote physical activity in primary care"
Get PDFABSTRACT
Background: Low physical activity is a major public health problem. New cost-effective approaches that stimulate meaningful long-term changes in physical activity are required, especially within primary care settings. It is becoming clear that there are various dimensions to physical activity with independent health benefits. Advances in technology mean that it is now possible to generate multidimensional physical activity ‘profiles’ that provide a more complete representation of physical activity and offer a variety of options that can be tailored to the individual. Mi-PACT is a randomised controlled trial designed to examine whether personalised multidimensional physical activity feedback and self-monitoring alongside trainer-supportive sessions increases physical activity and improves health outcomes in at-risk men and women. Methods/design: We aim to recruit 216 patients from within primary care aged 40 to 70 years and at medium or high risk of cardiovascular disease and/or type II diabetes mellitus. Adopting an unequal allocation ratio (intervention: control) of 2:1, participants will be randomised to one of two groups, usual care or the intervention. The control group will receive usual care from their general practitioner (GP) and standardised messages about physical activity for health. The intervention group will receive physical activity monitors and access to a web-based platform for a 3-month period to enable self-monitoring and the provision of personalised feedback regarding the multidimensional nature of physical activity. In addition, this technology-enabled feedback will be discussed with participants on five occasions during supportive one-to-one coaching sessions across the 3-month intervention. The primary outcome measure is physical activity, which will be directly assessed using activity monitors for a 7-day period. Secondary measures include weight loss, fat mass, and markers of metabolic control, motivation and well-being. All measures will be performed at baseline, post intervention and at 12-month follow-up. Discussion: Results from this study will provide insight into the effects of integrated physical activity profiling and self-monitoring combined with in-person support on physical activity and health outcomes in patients at risk of future chronic disease. Trial registration: Current Controlled Trials ISRCTN18008011
DFT study of the reaction between DBU, CO2 and (R)-1,3-butanediol to form cyclic carbonate (R)-4-Methyl-[1,3]-dioxan-2-one
No full textArticle title:
Synthesis of 6-membered cyclic carbonates from 1,3-diols and low CO2 pressure : a novel mild strategy to replace phosgene reagents
Authors:
Georgina Gregory, Marion Ulmann and Antoine Buchard*
DFT study: Optimised structures of local minima and transition states from the potential energy surface of the reaction between DBU, CO2 and (R)-1,3-butanediol.
Protocol: rωb97xD/6-31+g(d)/ SCRF=(cpcm,solvent= methanol)
Content: Potential Energy Surface diagram and Gaussian09 rev A.02 output filesDFT Protocol: rωb97xD/6-31+g(d)/ SCRF=(cpcm,solvent= methanol)
Software: Gaussian09 rev A.0
Metal influence on the iso- and hetero-selectivity of complexes of bipyrrolidine derived Salan ligands for the polymerisation of rac-lactide
Get PDFData to accompany the paperData:
NMR
GPC
DSC
DFT
X-ray data
Full experimental details and procedures are in the word document
Data for "Solid-state chemistry of glassy antimony oxides"
No full textData to accompany the article "Solid-state chemistry of glassy antimony oxides"
Dataset for "Carbohydrate-rich breakfast attenuates glycaemic, insulinaemic and ghrelin response to ad libitum lunch relative to morning fasting in lean adults"
Get PDFBreakfast omission is associated with obesity and cardiovascular disease/diabetes, but the acute effects of extended morning fasting upon subsequent energy intake and metabolic/hormonal responses have received less attention. In a randomised crossover design, thirty-five lean men (n=14) and women (n=21) extended their overnight fast or ingested a typical carbohydrate-rich breakfast in quantities relative to resting metabolic rate (i.e. 1963±238 kJ), before an ad libitum lunch 3 hours later. Blood samples were obtained hourly throughout the day until 3 hours post-lunch, with subjective appetite measures assessed. Lunch intake was greater following extended fasting (640±1042 kJ, P<0.01) but incompletely compensated for the omitted breakfast, with total intake lower than the breakfast trial (3887±1326 kJ vs 5213±1590 kJ, P<0.001). Systemic concentrations of peptide tyrosine-tyrosine and leptin were greater during the afternoon following breakfast (both P<0.05) but neither acylated/total ghrelin concentrations were suppressed by the ad libitum lunch in the breakfast trial, remaining greater than the morning fasting trial throughout the afternoon (all P<0.05). Insulin concentrations were greater during the afternoon in the morning fasting trial (all P<0.01). There were no differences between trials in subjective appetite during the afternoon. In conclusion, morning fasting caused incomplete energy compensation at an ad libitum lunch. Breakfast increased some anorectic hormones during the afternoon but paradoxically abolished ghrelin suppression by the second-meal. Extending morning fasting until lunch altered subsequent metabolic and hormonal responses but without greater appetite during the afternoon. This study clarifies the impact of acute breakfast omission and adds novel insights into second-meal metabolism
Atomically resolved real-space imaging of hot electron dynamics
No full textThe dynamics of hot electrons are central to understanding the properties of many electronic devices. But their ultra-short lifetime, typically 100 fs or less, and hence their corresponding transport length-scale of a few nanometers severely constrains real space investigations. Here we report variable temperature and voltage measurements of the nonlocal manipulation of adsorbed molecules on the Si(111)-7x7 surface in the scanning tunnelling microscope. The range of the nonlocal effect increases with temperature and, at constant temperature, is invariant over a wide range of electron energies. The measurements probe, in real space, the underlying hot electron dynamics on the 10 nm scale and are well described by a two-dimensional diffusive model with a single decay channel, consistent with 2PPE measurements of the real time dynamics.Please see main paper methods section. For radial distributions we present the raw N/N0 and thermally corrected data as well, again see methods section for details
Dataset for the effective length of columns in multi-storey frames
No full textData set to support the Engineering Structures paper "The effective length of columns in multi-storey frames
Effect of extended morning fasting upon ad libitum lunch intake and associated metabolic and hormonal responses in obese adults-Dataset
No full textDataset for Effect of extended morning fasting upon ad libitum lunch intake and associated metabolic responses in obese adultsData collection method described in full in the associated publication "Effect of extended morning fasting upon ad libitum lunch intake and associated metabolic and hormonal responses in obese adults
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