The abscissa of convergence of the laplace-stieltjes transform of a ph-distribution

If a probability distribution of phase type has an irreducible representation (α,T), the abscissa of convergence of its Laplace-Stieltjes transform is shown to be the eigenvalue of maximum real part of the matrix T.     

Jealousy in Firstborn Toddlers within the Context of the Primary Family Triad

Childhood jealousy has typically been examined in a limited number of jealousy‐evoking contexts and mainly with the mother only, thus providing a narrow view on the manifestations of jealousy. The aim of the present article is to examine childhood jealousy within parent–child dyads and (mother–father–child) triads and across multiple contexts. The sample included 87 Dutch families with a toddler (38 girls, 49 boys, M_age: 23 months). Children were challenged in several jealousy‐evoking situations using social and non‐social objects as rivals during videotaped family play sessions. Children's jealous behavior (e.g., negativity, distraction) and jealous emotions (e.g., anger) were coded. We found the most jealous behavior in contexts including a doll as a rival and the least in the non‐social object conditions. Children showed more jealous behavior toward mothers than fathers. Children showed elevated levels of anger in most jealousy situations.     

Theories of network exchange: Anomalies,desirable properties,and critical networks

The present study evaluates four well-known theories of exchange in networks. In previous research these theories’ predictions were compared for a small set of networks using experimental data. We compared their predictions for all 12,112 networks up to size 8. By comparing these predictions we (i) identified anomalies in theories of network exchange, (ii) investigated to what extent the theories satisfy basic principles of exchange, (iii) identified ‘critical’ networks for which predictions are very different. We conclude that exchange in networks is not yet well understood.     

Verfolgungsnetzwerke

In the literature, the power structures during the rule of National Socialism are characterized as a more or less uncoordinated mix of administrative bodies, which often worked parallel to or even against each other. This structure has been widely labeled as “Polycracy” or even as “Organized Chaos”. It is yet unknown, however, whether these characteristics intensified or mitigated the persecution of the Jewish population in Europe under Nazi rule. Also, an operationalization of the “Polycracy” concept and a subsequent measurement of these specific features of Nazi rule has yet to be done. In the article, the structure of the Nazi government and persecution apparatus is operationalized through division of labor and differentiation of power applying the network concept. These structural characteristics are then measured using quantitative network analysis. This is demonstrated by presenting the case of the persecution of “converted Jews” in the Netherlands from summer 1942 to spring 1943. In the conclusion, the potential of network analysis for holocaust research and the implications of the findings for the overarching questions in this research area are discussed.     

Quebec Sociology: A Discipline and its Object

Quebec sociology and Quebec society are categorically distinct from other sociologies and countries. Both are “communities,” both have French-speaking majorities, and both exist in Anglo-Saxon environments. As well, Quebec sociology has always been and continues to be obsessed by the national question. Interpretations proposed by sociologists—predominantly French-speaking—of and about the Quebec Question have never been independent of the struggles in which they have taken place. In fact, sociological readings of nationalism in Quebec appear to be a direct consequence of their social position and relationship with political power. Through the prism of sociology, the French-speaking collectivity in Canada has been, successively and simultaneously, characterized through categories of race, ethnic group, society, and nation. 2 This article presents five ways in which sociologists have represented Quebec society. First, the Pioneers: Léon Gérin and Marius Barbeau, or the Quebec “Difference” as a handicap. Second, the characterization of Quebec through race, territory, and soul. Third provides the external perspectives of Miner and Hughes. Fourth will examine the Laval (Quebec) School. Finally, this article will examine Quebec Society as either an ethnic or civic nation. Each theme has been set chronologically in specific periods of Quebec sociology: the Pioneers (Part 1 and 2, before 1940); the institutionalization of academic sociology (Part 3 and 4, 1940-1969); and the “nationalization” and professionalization of sociology (Part 5, 1970 to the present).     

Neighborhood does matter!

The discontinuation of social housing projects has lead to increasing tendencies of social segregation in German cities over the past decades. American and recently also European research has frequently shown that the increasing social segregation of neighbourhoods produces contextual effects on the educational success of children and youths living in the respective neighbourhoods. This contribution draws on data from the Berlin ELEMENT-study to investigate whether socio-cultural neighbourhood characteristics have an effect on the competence development of elementary school children in the time span between 4th and 6th grade. Results indicate that—apart from individual composition effects—living in a socially deprived neighbourhood does not have a negative effect on student’s competence development. On the other hand living in a privileged neighbourhood does in fact have a positive effect on student’s competence development—independently of composition effects. Therefore, educational inequalities are indeed intensified by neighbourhood effects, but not in the way that deprived neighbourhoods have a negative effect on the competence development of students living in them but rather in the way that living in a neighbourhood characterized by a favourable social structure positively affects student’s competence development.     

Gerechtigkeit und Arbeitskontext – Zur Bedeutung situativer Merkmale für die Gerechtigkeitswahrnehmung von Führungskr?ften

Leaders who are perceived to act with fairness can evoke desired employee behaviour in unique ways. Until now, little attention has been paid to the influence of situational factors on judging leader??s fairness in the work context. Based on the event paradigm, this study explores the formation of employee??s perception of leader??s justice in the context of work distribution through a variety of situational factors. Using a factorial survey we show that not only well-known factors such as respectful and reasonable behaviour affect the perception of leader??s fairness but also situational factors such as speech situation, trust between leader and follower, and the quality of the task.     

Who Believes in the Storybook Image of the Scientist?

Do lay people and scientists themselves recognize that scientists are human and therefore prone to human fallibilities such as error, bias, and even dishonesty? In a series of three experimental studies and one correlational study (total N = 3,278) we found that the “storybook image of the scientist” is pervasive: American lay people and scientists from over 60 countries attributed considerably more objectivity, rationality, open-mindedness, intelligence, integrity, and communality to scientists than to other highly-educated people. Moreover, scientists perceived even larger differences than lay people did. Some groups of scientists also differentiated between different categories of scientists: established scientists attributed higher levels of the scientific traits to established scientists than to early-career scientists and Ph.D. students, and higher levels to Ph.D. students than to early-career scientists. Female scientists attributed considerably higher levels of the scientific traits to female scientists than to male scientists. A strong belief in the storybook image and the (human) tendency to attribute higher levels of desirable traits to people in one’s own group than to people in other groups may decrease scientists’ willingness to adopt recently proposed practices to reduce error, bias and dishonesty in science.     

Running on age in a 15-km road run: minor influence of age on performance

The importance of exercise in the elderly is widely recognized, but data on performances and drop-out in short running contests are lacking. This hinders stimulation and coaching of elderly persons in active aging. The aim of the study was to determine age-related changes in running performance in the most popular Dutch road run, and how this is influenced by gender, training, and increased participation rate over the last decade. This is a retrospective analysis of 194,560 participants of a 15-km run from 1995 to 2007. Multiple regression analysis of running time by age, gender, and training was performed. Trends in participation were examined by chi-square tests and ANOVA. Trends in running time and speed were examined by t tests. With aging, running time increased with 0.20% per year (P < 0.001). Running time was on average 13% (P < 0.001) shorter in men than in women and was 15.7% (P < 0.001) shorter in participants who trained on a regular basis. Decline in performance with age was 5.9% larger for men than women (P < 0.01) and 4.5% larger for trained than untrained participants (P < 0.01). Over the last decade, participation numbers increased most for elderly (≥60 years) and female participants, mean running performance declined with 9.9% (P < 0.001). Drop-out number was low at all ages (0.13–0.29%). It appears that aging has only minor negative influences on running performance, which can even be attenuated by training. Our data suggest that exercise by means of running is a safe and rewarding option for improvement of healthy and active aging.