Oftentimes these systems are only statically calibrated. However, wheelchair propulsion is dynamic by nature, requiring a dynamic validation process. The aim of the current project was to present a low-cost portable system for the dynamic metrological verification of wheelchair roller ergometers, based on an instrumented reference wheel. The tangential force on the roller is determined, along with its uncertainty, from the reference wheel properties, and compared with the force measured by the ergometer. Uncertainty of this reference wheel system was found to be lower than the one of the ergometer used, indicating that this novel approach can be used for the metrological verification of ergometers.
DOCUMENT
Light profoundly impacts many aspects of human physiology and behaviour, including the synchronization of the circadian clock, the production of melatonin, and cognition. These effects of light, termed the non-visual effects of light, have been primarily investigated in laboratory settings, where light intensity, spectrum and timing can be carefully controlled to draw associations with physiological outcomes of interest. Recently, the increasing availability of wearable light loggers has opened the possibility of studying personal light exposure in free-living conditions where people engage in activities of daily living, yielding findings associating aspects of light exposure and health outcomes, supporting the importance of adequate light exposure at appropriate times for human health. However, comprehensive protocols capturing environmental (e.g., geographical location, season, climate, photoperiod) and individual factors (e.g., culture, personal habits, behaviour, commute type, profession) contributing to the measured light exposure are currently lacking. Here, we present a protocol that combines smartphone-based experience sampling (experience sampling implementing Karolinska Sleepiness Scale, KSS ratings) and high-quality light exposure data collection at three body sites (near-corneal plane between the two eyes mounted on spectacle, neck-worn pendant/badge, and wrist-worn watch-like design) to capture daily factors related to individuals’ light exposure. We will implement the protocol in an international multi-centre study to investigate the environmental and socio-cultural factors influencing light exposure patterns in Germany, Ghana, Netherlands, Spain, Sweden, and Turkey (minimum n = 15, target n = 30 per site, minimum n = 90, target n = 180 across all sites). With the resulting dataset, lifestyle and context-specific factors that contribute to healthy light exposure will be identified. This information is essential in designing effective public health interventions.
MULTIFILE
News media in The Netherlands show great variety in the extent and ways, in which they realize media accountability online in terms of actor transparency, product transparency and feedback opportunities online. It is suggested that even those news rooms that seem to adhere to transparency and public accountability still need to explore the functionality and application of media accountability instruments (MAI). Both in terms of potentials and pitfalls, news rooms need to consider about what they want to be transparent and in what ways. To the extent that online innovations are visible, traditional news media seem to experiment, as is the case with newsroom blogs or the project of hyper local journalism Dichtbij.nl, part of the Telegraaf Company. Various news media have on-going projects on audience participation, online applications and distribution models. However, since many projects merely aim at finding new applications, processes, platforms and business models, it remains to be seen assess whether projects are indeed reasonably innovative and feasible at the same time. The development of an online and therefore immediate, archived, personalized and interactive context, offers practical and ethical challenges to Dutch journalism. These challenges bring shifts in its role and responsibility to society. It means that changes occur in what journalists are accountable for, as well as ways in how they are accountable. The Dutch media landscape lodges various professional accountability instruments like the press council and both profession-wide and news media specific codes of ethics, but some of these instruments receive only moderate support. Proactive openness is more an exception than the rule and may well be a distinctive indicator for quality journalism. Although news media often acknowledge the importance of media accountability offline and online, they often lack the resources or courage to use them or have different priorities. This ambiguous position may indicate that in relation to media accountability online, Dutch news media are between hope and fear: that it will either improve their relationship with the public and fuel professional quality, or ask too much of resources with too little benefit.
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