Application of bag sampling technique for particle size distribution measurements

Bag sampling techniques can be used to temporarily store an aerosol and therefore provide sufficient time to utilize sensitive but slow instrumental techniques for recording detailed particle size distributions. Laboratory based assessment of the method were conducted to examine size dependant deposition loss coefficients for aerosols held in VelostatTM bags conforming to a horizontal cylindrical geometry. Deposition losses of NaCl particles in the range of 10 nm to 160 nm were analysed in relation to the bag size, storage time, and sampling flow rate. Results of this study suggest that the bag sampling method is most useful for moderately short sampling periods of about 5 minutes

Temperature enhanced effects of ozone on cardiovascular mortality in 95 large US communities, 1987-2000 - assessment using the NMMAPS data

A few studies examined interactive effects between air pollution and temperature on health outcomes. This study is to examine if temperature modified effects of ozone and cardiovascular mortality in 95 large US cities. A nonparametric and a parametric regression models were separately used to explore interactive effects of temperature and ozone on cardiovascular mortality during May and October, 1987-2000. A Bayesian meta-analysis was used to pool estimates. Both models illustrate that temperature enhanced the ozone effects on mortality in the northern region, but obviously in the southern region. A 10-ppb increment in ozone was associated with 0.41 % (95% posterior interval (PI): -0.19 %, 0.93 %), 0.27 % (95% PI: -0.44 %, 0.87 %) and 1.68 % (95% PI: 0.07 %, 3.26 %) increases in daily cardiovascular mortality corresponding to low, moderate and high levels of temperature, respectively. We concluded that temperature modified effects of ozone, particularly in the northern region

Psychometric properties of the parenting belief scale in a multi-country sample of parents from high-income countries

Background Parents' beliefs about how private/public their parenting role is and their acceptability of the use of corporal punishment as a disciplinary measure have been associated with how parents raise their children and their willingness to seek support. However, there are no reliable and valid instruments measuring these beliefs. Objective This study evaluated the psychometric properties of the Parenting Belief Scale, a self-reported brief measure targeting parents' perception of parenting as a private concern and their attitudes towards the use of corporal punishment. Participants and setting Participants were 6949 parents from several high-income countries (i.e., Australia, Belgium, Canada, Germany, Hong Kong, Australia, and the UK) who completed the International Parenting Survey, an online cross-sectional survey focused on parents' self-report of their parenting, children, and family. Methods This study evaluated the internal consistency, factor structure (i.e., exploratory and confirmatory factor analyses), and convergent and discriminant validity of the Parenting Belief Scale. Results Findings indicated that this scale was a relatively reliable measure to evaluate parents' perceived privacy in their role and acceptability of corporal punishment. A two-factor structure was confirmed by both exploratory and confirmatory factor analyses. Correlations with scales of parenting practices supported the convergent and discriminant validity of the Parenting Belief Scale. Conclusions This study supported the use of the Parenting Belief Scale across high-income countries to evaluate parenting beliefs in influencing parenting practices and parents' help-seeking behaviours

Acceptability of corporal punishment and use of different parenting practices across high-income countries

Worldwide, many children experience corporal punishment. Most research on corporal punishment has focused on parents' attitudes and use of corporal punishment; however, other relevant parenting factors and practices have rarely been examined. This study explored differences among countries with various levels of progress toward a total legal ban of corporal punishment in parents' acceptability of corporal punishment, perception of parenting as a private concern, relationship with their child and parenting practices: consistency, coercive parenting, use of smacking and positive encouragement. Parents (N = 6760) of 2- to 12-year-old children from Australia, Belgium, Canada, Germany, Hong Kong, Spain, Switzerland and the United Kingdom completed the International Parenting Survey, an online cross-sectional survey. One-way ANOVAs, and MANCOVAs (after controlling for parent age, gender and educational level), indicated significant country differences. Overall, there was no clear link between corporal punishment bans and positive parenting beliefs, practices and behaviours. The two countries where corporal punishment is banned showed different patterns. Parents in Germany showed less acceptability and use of smacking; however, parents in Spain reported the highest use of coercive parenting. Country differences suggest that beyond a legal ban, attention is needed on how to support parents to raise their children in a positive, nurturing environment

Ultrafine particles in cities

Ultrafine particles (UFPs; diameter less than 100 nm) are ubiquitous in urban air, and an acknowledged risk to human health. Globally, the major source for urban outdoor UFP concentrations is motor traffic. Ongoing trends towards urbanisation and expansion of road traffic are anticipated to further increase population exposure to UFPs. Numerous experimental studies have characterised UFPs in individual cities, but an integrated evaluation of emissions and population exposure is still lacking. Our analysis suggests that the average exposure to outdoor UFPs in Asian cities is about four-times larger than that in European cities but impacts on human health are largely unknown. This article reviews some fundamental drivers of UFP emissions and dispersion, and highlights unresolved challenges, as well as recommendations to ensure sustainable urban development whilst minimising any possible adverse health impacts

Ultrafine particles in cities

Peer reviewe

Down-phase auditory stimulation is not able to counteract pharmacologically or physiologically increased sleep depth in traumatic brain injury rats

Modulation of slow-wave activity, either via pharmacological sleep induction by administering sodium oxybate or sleep restriction followed by a strong dissipation of sleep pressure, has been associated with preserved posttraumatic cognition and reduced diffuse axonal injury in traumatic brain injury rats. Although these classical strategies provided promising preclinical results, they lacked the specificity and/or translatability needed to move forward into clinical applications. Therefore, we recently developed and implemented a rodent auditory stimulation method that is a scalable, less invasive and clinically meaningful approach to modulate slow-wave activity by targeting a particular phase of slow waves. Here, we assessed the feasibility of down-phase targeted auditory stimulation of slow waves and evaluated its comparative modulatory strength in relation to the previously employed slow-wave activity modulators in our rat model of traumatic brain injury. Our results indicate that, in spite of effectively reducing slow-wave activity in both healthy and traumatic brain injury rats via down-phase targeted stimulation, this method was not sufficiently strong to counteract the boost in slow-wave activity associated with classical modulators, nor to alter concomitant posttraumatic outcomes. Therefore, the usefulness and effectiveness of auditory stimulation as potential standalone therapeutic strategy in the context of traumatic brain injury warrants further exploration