Les remariages, de plus en plus nombreux au Québec

Les remariages ont peu fait l’objet d’étude au Québec. Etant relativement peu nombreux et leur proportion étant stable depuis plusieurs années, on comprend pourquoi on ne leur a attaché que peu d’importance jusqu’à présent. Mais depuis 1969, le nombre des divorcés (ées), s’accroissant rapidement, l’importance des remariages est sans cesse grandissante. De 6,0 pour cent qu’était la part relative des remariages en 1969 parmi l’ensemble des mariages, celle-ci atteint 10,9 pour cent (chez les hommes) en 1975. Cette brève étude se penche, sur les principales caractéristiques des personnes qui se remarient, en distinguant les veufs (ves) des divorcés (ées). On met de plus en lumière les possibilités d’analyses offertes par les données tirées des nouveaux formulaires de déclaration de mariage en vigueur depuis 1975

L’enfant et la rupture d’union

Cet article a pour but de présenter quelques données sommaires et générales sur le nombre d’enfants et de couples impliqués dans les ruptures d’union. Nous considérons les trois phénomènes, veuvage, divorce et séparation légale. Pour des raisons de disponibilité de données, nos calculs ne portent que sur la seule année 1975. Notre principale conclusion, c’est que le veuvage est le phénomène qui touche le plus grand nombre d’enfants, suivi d’assez près du divorce et de loin de la séparation légale. Au total, les ruptures d’union ont impliqué en 1975 approximativement 56 000 adultes et 46 000 enfants

Delayed Dynamical Systems: Networks, Chimeras and Reservoir Computing

We present a systematic approach to reveal the correspondence between time delay dynamics and networks of coupled oscillators. After early demonstrations of the usefulness of spatio-temporal representations of time-delay system dynamics, extensive research on optoelectronic feedback loops has revealed their immense potential for realizing complex system dynamics such as chimeras in rings of coupled oscillators and applications to reservoir computing. Delayed dynamical systems have been enriched in recent years through the application of digital signal processing techniques. Very recently, we have showed that one can significantly extend the capabilities and implement networks with arbitrary topologies through the use of field programmable gate arrays (FPGAs). This architecture allows the design of appropriate filters and multiple time delays which greatly extend the possibilities for exploring synchronization patterns in arbitrary topological networks. This has enabled us to explore complex dynamics on networks with nodes that can be perfectly identical, introduce parameter heterogeneities and multiple time delays, as well as change network topologies to control the formation and evolution of patterns of synchrony

Measuring and modeling the (limited) consistency of free choice attitude questions

On average, respondents who give a positive answer to a binary free choice attitude question are NOT more likely, if surveyed again, to respond positively than to response negatively. However, stronger brands obtain more repeated positive answers. Our model shows why these two effects have to happen, even though all brands in a category benefit from the same reliability.survey reliability; attitude measurement; stochastic models; beta-binomial model; brand image; market research

An attempt to use scratch tests to predict the residual lifetime of unplasticised poly(vinyl chloride) pipes,

This paper reports on a procedure that can potentially predict the residual lifetime of low-pressure uPVC pipes in a non-destructive way. Ageing of these materials is characterised by a change in yield stress and fracture behaviour. The search for a method being able to non-destructively evaluate the yield stress and the fracture behaviour led to the study of scratching of the polymer surface. According to an extensive study by Atkins and Liu, the scratching behaviour is a function of yield stress, fracture toughness and the attack angle of the cutting tool. Experiments reported in this paper give an evaluation of the scratched area as a function of the attack angle for uPVC samples having different ageing times. Existing analyses for metals are adapted for polymer specific properties, such as the pronounced strain rate dependence of yield stress and visco-elastic recovery. The suggested adaptations are successful in the sense that the resulting analysis is capable of describing the forces during scratching and the resulting cross-sectional area of the groove. Although the scratching technique was not able to discriminate between differences in the scratch force or cross-sectional area of the groove of the different ageing times, it was possible to get an estimate of the fracture toughness from the analysis. Therefore, scratching is a promising technique to determine the fracture toughness for ductile materials for which it is difficult to obtain accurate results with conventional techniques