Real and rational variants of the h-index and the g-index

The definitions of the rational and real-valued variants of the h-index and g-index are reviewed. It is shown how they can be obtained both graphically and by calculation. Formulae are derived expressing the exact relations between the h-variants and between the g-variants. Subsequently these relations are examined. In a citation context the real h-index is often, but not always, smaller than the rational h-index. It is also shown that the relation between the real and the rational g-index depends on the number of citations of the article ranked g + 1. Maximum differences between h, h_r and h_rat on the one hand and between g, g_r and g_rat on the other are determined.     

Automated LED tracking to measure instantaneous velocities in swimming

In this paper a video-based method to automatically track instantaneous velocities of a swimmer is presented. Single cameras were used to follow a marker (LED) attached to the body. The method is inspired by particle tracking techniques, traditionally used in the field of fluid dynamics, to measure local velocities of a fluid flow. During the validation experiment, a white LED was attached to the hip of a swimmer together with a speedometer. A swimmer performed four different stroke types. The velocity profiles using LED tracking were captured and showed less noise than the speedometer measurements. Only at times when the marker disappeared above the water surface due to body role in front crawl and backstroke swimming did the LED tracking fail to capture the athlete’s motion. The algorithm was tested in a 2D case with a single LED to illustrate the proof of principle, but should be suitable for implementation in a 3D analysis or multiple LED analysis.     

Cultural Values and Social Differentiation: The Catholic pillar and its education system in Belgium and the Netherlands

According to research on 'pillarization', some European countries (such as Belgium and the Netherlands) are internally divided into blocs of different religious and political persuasions. In this article, it is indicated that the success of the pillars has never been unambiguous. In domains of professional services, like education and health care, the pillars were successful. Other societal sectors, which function more impersonally, could escape from their influence. Pillars could flourish in societal sectors, whose functioning depends on face-to-face contacts. This explains why 'religious virtuosos' were able to fulfil such a prominent role in the Catholic pillar, and especially in Catholic education.