Realisation of micro-speckle patterns for digital image correlation on dental implants

In vitro experiments and finite element analyses can be used to investigate the mechanical performance of dental implant structures. But before experimental and mechanical evaluations can be carried out, the right material properties, test methods and measurement techniques should be pointed out. The material properties of dental implants and characteristics of the jaw bone are widely documented. Concerning the right experimental setup and measurement techniques no conclusive description is given. Digital Image Correlation (DIC) is currently a widespread method. It uses random speckle patterns that are correlated to accurately measure displacement and strains of 3D-structures. If accurate results are pursued, first a thorough optimisation of this measuring technique must be accomplished. The choices are made based on the expected effect of load application on a dental implant. In literature the expected displacements are quite small, magnitude 100μm, which requires high accuracy measurements. The possibilities of using DIC on micro-scale for titanium components is discussed in this paper

La logique interne du paradoxe dans la dialectique de Soren Kierkegaard

Doctorat en philosophie et lettres (philosophie) (ISP 3)--UCL, 199

Facebook au regard de la législation européenne relative à la protection de la vie privée et des données à caractère personnel

Master [120] en droit, Université catholique de Louvain, 201

Explorative study of the neuropsychological effects of lead in Belgian urban children

cosponsored by CEC, WHO, EPA etcinfo:eu-repo/semantics/nonPublishe

Mood and sleep. I. Effects of the menstrual cycle

4 female subjects were studied during 8 nights each at corresponding days of the menstrual cycle. No clear cycle effects could be discerned in the sleep variables of the subjects as a group. In one subject, however, a U-shaped course of negative mood was found during the menstrual cycle, together with an enhanced percentage of stage 2 sleep and a lowered percentage of slow wave sleep at the time of the menses. In the 3 other subjects' cycles no such cyclic variations in the mood or sleep variables were found.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The emotional brain and sleep: an intimate relationship. Sleep Med

s u m m a r y Research findings confirm our own experiences in life where daytime events and especially emotionally stressful events have an impact on sleep quality and well-being. Obviously, daytime emotional stress may have a differentiated effect on sleep by influencing sleep physiology and dream patterns, dream content and the emotion within a dream, although its exact role is still unclear. Other effects that have been found are the exaggerated startle response, decreased dream recall and elevated awakening thresholds from rapid eye movement (REM)-sleep, increased or decreased latency to REM-sleep, increased REMdensity, REM-sleep duration and the occurrence of arousals in sleep as a marker of sleep disruption. However, not only do daytime events affect sleep, also the quality and amount of sleep influences the way we react to these events and may be an important determinant in general well-being. Sleep seems restorative in daily functioning, whereas deprivation of sleep makes us more sensitive to emotional and stressful stimuli and events in particular. The way sleep impacts next day mood/emotion is thought to be affected particularly via REM-sleep, where we observe a hyperlimbic and hypoactive dorsolateral prefrontal functioning in combination with a normal functioning of the medial prefrontal cortex, probably adaptive in coping with the continuous stream of emotional events we experience. Ó 2010 Elsevier Ltd. All rights reserved. Introduction Even though the relationship between pre-sleep emotional experiences and quality of sleep, as well as the reason why we sleep, seems intuitively evident, until recently this topic has gotten increased attention. The scarce amount of research is surprising given the importance of sleep in emotional well-being and the occurrence of disturbed sleep in many psychological and psychiatric disorders. In this review, the scope will concentrate on the relationship between emotion and sleep, particularly rapid eye movement (REM)-sleep and its emotion modulatory and even emotion regulatory functions in especially healthy individuals. In the first part, we review how to understand how emotional situations affect sleep and how sleep affects emotional processing of affective information. In the second part, the discussed findings are evaluated in light of neurophysiological insights. Research findings appear to confirm our own life-experience where daytime events, especially emotionally stressful events, have an impact on the quality of our sleep and well-being. Daytime emotional stress may have a twofold effect on sleep: first by influencing sleep physiology and second by influencing dream patterns, dream content and the emotion within a dream, although its exact role still is unclear. Even social phenomena such as reduced social support and increased patterns of avoidance in a person's emotion regulation, appear to result in psychological distress and sleep complaints. 1 Furthermore, the association between cortical and emotional arousal and disrupted sleep in individuals with insomnia suggests a strong relationship between daytime events and disrupted sleep. As a matter of evidence, it is clear that the individual's response and coping with the emotional stress associated with daytime events involves the capacity to de-arouse or disengage from active wake processing interfering with the normal initiation of sleep processes

A regression analysis study of the Brussels lead and IQ data

Published for the European Communities and the U.S. Environmental Protection Agencyinfo:eu-repo/semantics/publishe