Dynamic behaviour of soils used for natural turf sports surfaces

The modulus and damping properties of soils in compression are a function of soil type, water content, stress history and loading rate. To model human–surface interaction with natural turf sports surfaces, stiffness and damping properties must be determined at dynamic loading rates. Two contrasting soil types, a Sand and a Clay Loam, commonly used in sports surfaces were loaded uniaxially to 2 kN at loading rates between 0.6 and 6 kN s⁻¹ in modified dynamic soil testing apparatus. Soils were compacted prior to loading but initial cycles resulted in viscoplastic deformation, with strain accumulation with repeated cycles of loading. Ultimately a resilient, viscoelastic steady-state equilibrium with loading was established. Resilient modulus and damping ratio varied with soil type, water content, stress history and increased significantly with loading rate. The resilient modulus of the Sand soil, typical of modern free-draining sand construction natural turf sports surfaces, was significantly greater than that of a Clay Loam soil more characteristic of traditional natural turf surfaces; reducing water content caused an increase in modulus and a decrease in damping ratio in the Clay Loam soil. Determination of these properties provides initial data for the modelling natural turf surface behaviour in terms of both ball and human interactions, with further research required to determine the effect of both grass roots and leaves on mechanical behaviour.     

Perceptions of national identity and attitudes toward immigrants and immigration in Canada and Germany

In the current research, we examined whether promoting an inclusive national ingroup that includes both immigrants and nonimmigrants would improve attitudes toward immigrants and immigration among members of receiving societies. We also determined whether one's nation of citizenship and individual differences in social dominance orientation would moderate the effects. Participants were 126 Canadian students and 282 German students, who completed a measure of social dominance orientation and were then asked to respond to a series of questions designed to heighten the salience of national identity (national identity), promote a national ingroup that includes immigrants (common national ingroup), or irrelevant questions (control). The dependent measures included attitudes toward immigrants and immigration, and subtle prejudice toward immigrants. Results revealed that the manipulation of a common national ingroup successfully promoted more positive attitudes toward immigrants and immigration among higher social dominance oriented Canadian participants, but tended to have detrimental effects on the attitudes of higher social dominance oriented German participants. Results are discussed in terms of the importance of considering the context in which groups are situated, as well as implications for developing strategies to promote harmony between immigrants and members of receiving societies.     

"Beyond the pale of ordinary criticism": eccentricity and the fossil books of Thomas Hawkins

Thomas Hawkins wrote two books about his extraordinary collection of fossil reptiles: Memoirs of Ichthyosauri and Plesiosauri (1834) and The Book of the Great Sea-Dragons (1840). When contemporary readers explicitly labeled these books "eccentric," they were making use of a new discourse that aimed to make sense of phenomena that appeared to transgress the boundaries of an increasingly ordered and structured world. Some modern-day commentators have dismissed Hawkins's books because of their perceived eccentricities. This essay, by contrast, uses techniques of close reading and reception analysis to investigate them precisely as specimens of "eccentric" literature. It argues that, like other eccentric phenomena, the books were perceived to be liminal--they were felt to undermine the generic boundaries that governed the production and interpretation of the different kinds of literary work. Eccentricity as a social and cultural phenomenon has received surprisingly little attention from scholars until very recently. Through analyzing and contextualizing Hawkins's books, and the varied responses they provoked, this essay aims to contribute to our understanding both of eccentricity and of the generic conventions shaping varieties of scientific writing in the nineteenth century and beyond.     

A Century of John and Evelyn Dewey's Schools of To-morrow: Rousseau,Recorded Knowledge,and Race in the Philosopher's Most Problematic Text

A century ago, John Dewey and his daughter Evelyn published Schools of To-morrow to nearly universal acclaim. However, over the course of the 20th century, critics of Dewey have drawn upon Schools of To-morrow to accuse him of being an uncritical disciple of French philosopher, Jean Rousseau, of being opposed to the transmission of content to students, and most recently of endorsing a curriculum that patronized Black students. As a result, the text has become John Dewey's most controversial and problematic. In this historical study, we seek to place Schools of To-morrow in its historical, intellectual, and social context. The first part of the study traces the writing and publication of the text, as well as its changing reception over the past century. The second part of the study directly responds to the three criticisms previously cited: that Dewey was a disciple of Rousseau, that Dewey was opposed to the transmission of content knowledge, and that Dewey endorsed the racially segregated school system of Indianapolis depicted in the text. Drawing upon Dewey's other writings, his course syllabi, his personal correspondence, and lecture notes, we argue that the first two accusations are unfounded, but the third is partially accurate, although incomplete. We conclude that Schools of To-morrow is an undervalued text in the Dewey cannon that warrants closer study.     

The mediating role of social relationships in the association of adolescents’ individual school self-concept and their school engagement,belonging and helplessness in school

It is well known that teachers frequently observe a decline in the scholastic motivation of many adolescent students, which in turn is often associated with a decline in students’ individual school self-concept. In contrast, less is known about the association between students’ individual school self-concept and school engagement, or the related concepts of school belonging and helplessness in school. The current study explored social relationships as mediators in the association between individual school self-concept and adolescents’ school engagement, belonging to school and helplessness in school in a large sample of 7th and 8th grade students (N?=?1088; M_Age?=?13.7) in secondary schools in Brandenburg, Germany. The results of two structural equation models showed that the teacher–student relationship mediated the association between individual school self-concept and school engagement, belonging to school and helplessness in school, respectively. In contrast, the student–student relationship did not mediate any of these associations.