Younger adolescents’ perceptions of physical activity, exergaming, and virtual reality:qualitative intervention development study

Background. Novel strategies to promote physical activity (PA) in adolescence are required. The vEngage study aims to test whether a virtual reality (VR) exergaming intervention can engage younger adolescents (13-15 year old) with physical activity. Objective: This study aimed to gather adolescents’ views of using VR to encourage PA and identify the key features they would like to see in a VR exergaming intervention via interviews. Methods: Participants were recruited through two schools in London, UK. Semi-structured interviews were conducted with adolescents about their views on PA and what might work to increase PA, technology, knowledge and experience of VR, and desired features in a VR exergaming intervention. Data were analysed using Framework Analysis. Results: 31 13-15 year olds (58% female, 62% from non-white ethnicities) participated in this interview study. The vast majority had no awareness of government PA recommendations, but felt they should be more thoroughly informed. All participants were positive about the use of VR in PA promotion. Rewards, increasing challenges and a social/multiplayer aspect were identified by participants as crucial aspects to include in a VR exercise game. Barriers were related to cost of high-end systems. Being able to exercise at home was very appealing. VR exergaming was viewed as a way to overcome multiple perceived social and cultural barriers to PA, particularly for girls. Conclusions: Key elements that should be incorporated into a VR for health intervention were identified and described. These also included the use of rewards, novelty and enjoyment in immersive game play, multi-player options, real-world elements, as well as continual updates and new challenge levels. The use of VR to promote PA in adolescents is promising, but some barriers were raised

Oil supply forecasting : a disaggregated process approach

This paper represents a collective effort by the Supply Analysis Group of the M.I.T. World Oil Project which is supported by the U.S. National Science Foundation under Grant no. SIA75-00739.U.S. National Science Foundation under Grant no. SIA75-00739

Sub-5 keV electron-beam lithography in hydrogen silsesquioxane resist

We fabricated 9–30 nm half-pitch nested Ls and 13–15 nm half-pitch dot arrays, using 2 keV electron-beam lithography with hydrogen silsesquioxane (HSQ) as the resist. All structures with 15 nm half-pitch and above were fully resolved. We observed that the 9 and 10-nm half-pitch nested Ls and the 13-nm-half-pitch dot array contained some resist residues. We obtained good agreement between experimental and Monte-Carlo-simulated point-spread functions at energies of 1.5, 2, and 3 keV. The long-range proximity effect was minimal, as indicated by simulated and patterned 30 nm holes in negative-tone resist.United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-SC0001088)National Science Foundation (U.S.) (Grant CMMI-0609241)China Scholarship CouncilNational Science Foundation (U.S.). Graduate Research Fellowshi

Breaking the cycle of maltreatment: The role of safe, stable, and nurturing relationships

Purpose We examine two research questions. First, does a history of child maltreatment victimization significantly increase the likelihood of maltreatment perpetration during adulthood? Second, do safe, stable, and nurturing relationships (SSNRs) during early adulthood serve as direct protective factors, buffering protective factors, or both to interrupt intergenerational continuity in maltreating behaviors? Methods Data come from the Rochester Youth Development Study that followed a community sample from age 14 to 31 with 14 assessments. Maltreatment victimization records covering birth through age 17 were collected from Child Protective Services records as were maltreatment perpetration records from age 21 to 30. Data on five SSNRs were measured during three interviews from ages 21 to 23. Results There is a significant relationship between maltreatment victimization and maltreatment perpetration (odds ratio = 2.57; 95% confidence interval = 1.47–4.50). Three of the five SSNRs investigated—relationship satisfaction, parental satisfaction, and attachment to child—served as direct protective factors, significantly reducing risk for those who had been maltreated. However, none of the interaction terms—between maltreatment victimization and the SSNR—was statistically significant, indicating that the SSNRs did not serve as buffering protective factors Conclusions Although a history of maltreatment significantly increases the risk of subsequent perpetration of maltreatment, enhancing SSNRs with intimate partners and with children during early adulthood can decrease the odds that a victim of maltreatment will become a perpetrator. Mandated reporters and service providers should be aware of the risk posed by earlier maltreatment and be prepared to ameliorate that risk, in part by strengthening supportive social relationships

Keck/LRIS Spectroscopic Confirmation of Coma Cluster Dwarf Galaxy Membership Assignments

Keck/LRIS multi-object spectroscopy has been carried out on 140 of some of the lowest and highest surface brightness faint (19 < R < 22) dwarf galaxy candidates in the core region of the Coma Cluster. These spectra are used to measure redshifts and establish membership for these faint dwarf populations. The primary goal of the low surface brightness sample is to test our ability to use morphological and surface brightness criteria to distinguish between Coma Cluster members and background galaxies using high resolution HST/ACS images. Candidates were rated as expected members, uncertain, or expected background. From 93 spectra, 51 dwarf galaxy members and 20 background galaxies are identified. Our morphological membership estimation success rate is ~100% for objects expected to be members and better than ~90% for galaxies expected to be in the background. We confirm that low surface brightness is a very good indicator of cluster membership. High surface brightness galaxies are almost always background with confusion arising only from the cases of the rare compact elliptical galaxies. The more problematic cases occur at intermediate surface brightness. Many of these galaxies are given uncertain membership ratings, and these were found to be members about half of the time. Including color information will improve membership determination but will fail for some of the same objects that are already mis-identified when using only surface brightness and morphology criteria. Compact elliptical galaxies with B-V colors ~0.2 magnitudes redward of the red sequence in particular require spectroscopic follow-up. In a sample of 47 high surface brightness, UCD candidates, 19 objects have redshifts which place them in the Coma Cluster. Redshift measurements are presented and the use of indirect means for establishing cluster membership is discussed.Comment: Accepted for publication in ApJ, 25 pages, 15 figure

Direct measurement of dark matter halo ellipticity from two-dimensional lensing shear maps of 25 massive clusters

We present new measurements of dark matter distributions in 25 X-ray luminous clusters by making a full use of the two-dimensional (2D) weak lensing signals obtained from high-quality Subaru/Suprime-Cam imaging data. Our approach to directly compare the measured lensing shear pattern with elliptical model predictions allows us to extract new information on the mass distributions of individual clusters, such as the halo ellipticity and mass centroid. We find that these parameters on the cluster shape are little degenerate with cluster mass and concentration parameters. By combining the 2D fitting results for a subsample of 18 clusters, the elliptical shape of dark matter haloes is detected at 7\sigma significance level. The mean ellipticity is found to be e = 0.46 \pm 0.04 (1\sigma), which is in excellent agreement with the standard collisionless CDM model prediction. The mass centroid can be constrained with a typical accuracy of ~20" (~50 kpc/h) in radius for each cluster with some significant outliers, enabling to assess one of the most important systematic errors inherent in the stacked cluster weak lensing technique, the mass centroid uncertainty. In addition, the shape of the dark mass distribution is found to be only weakly correlated with that of the member galaxy distribution. We carefully examine possible sources of systematic errors in our measurements, finding none of them to be significant. Our results demonstrate the power of high-quality imaging data for exploring the detailed spatial distribution of dark matter (Abridged).Comment: 17 pages, 10 figures, MNRAS in pres

Does Protein Supplementation Support Adaptations to Arduous Concurrent Exercise Training? A Systematic Review and Meta-Analysis with Military Based Applications

We evaluated the impact of protein supplementation on adaptations to arduous concurrent training in healthy adults with potential applications to individuals undergoing military training. Peer-reviewed papers published in English meeting the population, intervention, comparison and outcome criteria were included. Database searches were completed in PubMed, Web of science and SPORTDiscus. Study quality was evaluated using the COnsensus based standards for the selection of health status measurement instruments checklist. Of 11 studies included, nine focused on performance, six on body composition and four on muscle recovery. Cohen’s d effect sizes showed that protein supplementation improved performance outcomes in response to concurrent training (ES = 0.89, 95% CI = 0.08–1.70). When analysed separately, improvements in muscle strength (SMD = +4.92 kg, 95% CI = −2.70–12.54 kg) were found, but not in aerobic endurance. Gains in fat-free mass (SMD = +0.75 kg, 95% CI = 0.44–1.06 kg) and reductions in fat-mass (SMD = −0.99, 95% CI = −1.43–0.23 kg) were greater with protein supplementation. Most studies did not report protein turnover, nitrogen balance and/or total daily protein intake. Therefore, further research is warranted. However, our findings infer that protein supplementation may support lean-mass accretion and strength gains during arduous concurrent training in physical active populations, including military recruits

Breast, prostate and colorectal cancer survivors’ experiences of using publicly available physical activity mobile apps: a qualitative study

Background: Physical activity (PA) can improve a range of outcomes following a cancer diagnosis. These include an improvement in experience of side effects of treatment (e.g. fatigue) and management of comorbid conditions. PA may also increase survival and reduce recurrence. Digital interventions have shown potential for PA promotion among cancer survivors, but most in a prior review were web-based and few studies used smartphone applications (apps). There are many PA apps available for general public use but it is unclear whether these are suitable as a PA intervention after a cancer diagnosis. Objective: This study sought post-treatment, non-metastatic, breast, prostate and colorectal cancer survivors’ opinions of using smartphone apps to promote PA and gathered their views on existing publicly available PA apps to inform a future intervention. Methods: Each participant was randomly assigned to download two of four apps (Human, The Walk, The Johnson & Johnson Official 7 Minute Workout, and Gorilla Workout). Participants used each app for one week consecutively. In-depth semi-structured telephone interviews were then conducted to understand participants’ experiences of using the apps and how app-based PA interventions could be developed for cancer survivors. The interviews were analysed using thematic analysis. Results: 32 participants took part: 16 (50%) had prostate cancer, 8 (25%) had breast and 8 (25%) had colorectal cancer. Three core themes were identified. The first theme was that multiple factors affect engagement with PA apps and this is highly personalised. Factors affecting engagement included participants’ perceptions of i) the advantages and disadvantages of using apps to support PA; ii) the relevance of the app to the user (e.g. in terms of cancer-related factors, their PA goals, the difficulty level of the app, the way in which they interact with their smartphone and the extent to which the app fits with their self-identity), iii) the quality of the app (e.g. usability, accuracy, quality of production, scientific evidence-base), and of iv) the behaviour change techniques used to promote PA. In the second theme, participants recommended that apps that promote walking are most appealing, as walking removes many barriers to PA. Finally, the participants suggested that PA apps should be integrated into cancer care, as they valued guidance and recommendations from healthcare professionals. Conclusions: This sample of breast, prostate and colorectal cancer survivors were receptive to the use of apps to promote PA. Although no publicly available PA app was deemed wholly suitable, many suggestions for adaptation and intervention development were provided. The results can inform the development of an app-based PA intervention for cancer survivors. They also highlight the wide-ranging and dynamic influences on engagement with digital interventions, which can be applied to other evaluations of mHealth products in other health conditions and other health behaviours

The Iron abundance in Galactic Planetary Nebulae

We constrain the iron abundance in a sample of 33 low-ionization Galactic planetary nebulae (PNe) using [Fe III] lines and correcting for the contribution of higher ionization states with ionization correction factors (ICFs) that take into account uncertainties in the atomic data. We find very low iron abundances in all the objects, suggesting that more than 90% of their iron atoms are condensed onto dust grains. This number is based on the solar iron abundance and implies a lower limit on the dust-to-gas mass ratio, due solely to iron, of M_dust/M_gas>1.3x10^{-3} for our sample. The depletion factors of different PNe cover about two orders of magnitude, probably reflecting differences in the formation, growth, or destruction of their dust grains. However, we do not find any systematic difference between the gaseous iron abundances calculated for C-rich and O-rich PNe, suggesting similar iron depletion efficiencies in both environments. The iron abundances of our sample PNe are similar to those derived following the same procedure for a group of 10 Galactic H II regions. These high depletion factors argue for high depletion efficiencies of refractory elements onto dust grains both in molecular clouds and AGB stars, and low dust destruction efficiencies both in interstellar and circumstellar ionized gas.Comment: Accepted for publication in ApJ. 15 pages, 4 Postscript figures, corrected typos, Tables 2 and 3 correcte