536 research outputs found

    Reinforced oxide throat insert development

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    Wire reinforced zirconium oxide rocket nozzle insert

    Developing the Next Generation of Physics Assessments

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    Science education at all levels is currently undergoing dramatic changes to its curricula and developing assessments for these new curricula is paramount. We have used the basis of many of these new changes (scientific practices, crosscutting concepts, and core ideas) to develop sets of criteria that can be used to guide assessment development for this new curriculum. We present a case study that uses the criteria we have developed to revise a traditional physics assessment item into an assessment item that is much more aligned with the goals of current transformation efforts. Assessment items developed using this criteria can be used to assess student learning of both the concepts and process of science.Comment: Revised version for PERC 2015 Conference Proceeding

    Response to Letter to the Editor: ‘India ink and cartilage’

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    Associations of public transportation use with cardiometabolic health: a systematic review and meta-analysis

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    Public transport provides an opportunity to incorporate physical activity into journeys, but potential health impacts have not been systematically examined. Literature searches were carried out up to December 2017 using Medline, Embase, Transport Database, Scopus, Cochrane Library, opengrey.eu and Google. We identified longitudinal studies which examined associations between public transport and cardio-metabolic health including: adiposity, type II diabetes, and cardiovascular disease. We assessed study quality using the Newcastle-Ottawa Scale for cohort studies and performed meta-analyses where possible. Ten studies were identified, seven investigating use of public transport and three examining proximity to public transport. Seven studies used individual level data on changes in BMI with objective outcomes measured in six studies. Study follow-up ranged from one to ten years with three studies adjusting for non-transport physical activity. We found a consistent association between public transport use and lower BMI. Meta-analysis of data from five comparable studies found that switching from car to public transport was associated with lower BMI: −0.30 kg/m2 (−0.47, −0.14). Few studies have investigated associations between public transport use and non-adiposity outcomes. These findings suggest that sustainable urban design which promotes public transport use may produce modest reductions in population BMI

    Associations of e-cigarette experimentation with support for tobacco control policies in the European Union, 2012-2014

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    Introduction: There are limited data on the potential effects of e-cigarette experimentation on support for tobacco control policies. To bridge this gap, we assessed associations between e-cigarette experimentation and support for tobacco control policies in the European Union 2012-2014. We also investigated variations across tobacco-use status, e-cigarette experimentation and sociodemographic characteristics. Methods: Datasets were used from the Special Eurobarometer for Tobacco surveys performed in 2012 (n=26 751) and 2014 (n=27 801). Tobacco control policies assessed were: banning advertising, policies to keep tobacco out of sight, banning online sales, banning flavors, standardized packaging, tax increases, and policies to reduce illicit trade in tobacco. We use multilevel logistic regression models to assess variations in socio-demographics and tobacco/e-cigarette use with support for these policies in 2014, and examined changes in support for these policies, between 2012 and 2014, separately by tobacco-use status (never, current, and former smokers). Results: Population support for tobacco control policies was high in 2014: policies to reduce illicit trade had the highest level of support at 70.1%, while tax increases were the least likely measure to be supported with 52.3% support. Among never and former smokers, experimentation with e-cigarettes was associated with reduced support for all tobacco control policies assessed. For example, never smokers who had experimented with e-cigarettes were less likely to support either tobacco advertising bans (adjusted odds ratio aOR=0.57, 95% confidence interval 0.46-0.71) or standardized packaging for tobacco (aOR=0.58, 95% CI: 0.47-0.71). Former smokers who had experimented with e-cigarettes were less likely to either support standardized packaging for tobacco (aOR=0.70, 95% CI: 0.60-0.82) or keeping tobacco out of sight (aOR=0.77, 95% CI: 0.65-0.90). Among current smokers, e-cigarette experimentation was not associated with support for the tobacco control policies assessed. Conclusions: E-cigarette experimentation was consistently associated with reduced support for tobacco control policies among never and former smokers but not among current smokers. The implications of these findings for tobacco control are unknown, but the data support concerns that e-cigarette experimentation may affect public support for established tobacco control policies within specific subgroups. Further research is needed to assess potential long-term impacts on tobacco control policies
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