Tensile deformation mechanisms of the hierarchical structure consisting of both twin-free grains and nanotwinned grains

A series of large-scale molecular dynamics simulations have been performed to investigate the tensile properties and atomistic deformation mechanisms for the nanostructured Cu with three typical microstructures: the hierarchical structure consisting of both twin-free grains (d?=?70?nm) and grains with bundles of smaller nanotwins (d?=?70?nm, λ?=?10?nm), the fully nanograined structure and the fully nanotwinned structure. The average flow stress of the hierarchically structure is found to be higher than that calculated by rule of mixture. As compared with that of fully nanograined structure, the strength for the twin-free grains in the hierarchical structure is promoted and gives extra hardening due to the increased dislocation density and dislocation behaviours. It is also found that the nanotwin bundles are more deformable than the twin-free grains in the hierarchical structure according to the deviatoric strain invariant contour. This indicates that the fully nanograined structure cannot only be strengthened to a higher level, but also obtain better ductility by embedded with stronger bundles of smaller nanotwins. Thus, a superior strength–ductility synergy could be obtained in this kind of hierarchical structures, and this novel strategy has also been implemented in bulk austenitic steels or copper by recent experiments.     

The Performance of Environmental Science in Research Teams

Scientists' practices rely not only on the discursive production of science but also on routine interactions whereby scientists manage their teams and their publics. The metaphor of the theatre helps explain how researchers perform impressions to different audiences. This metaphor can also help analyse how scientists and researchers cooperate in performance teams in order to manage credibility impressions. How are research teams constructed and maintained? How do team members respond to the challenges of coordinating the team and elaborating a common vision given their differences in aims and understandings? From 2005 to 2007 a scientific team worked together in the city of Tuzla, Bosnia and Herzegovina, to develop land remediation measures for coal waste disposal sites. The team was organised around a common front developed through ongoing negotiation and bargaining. Scientists employed different strategies to maintain the team through the development of the project, such as reciprocity, unanimity and bargaining. To accommodate individual views, the common front emphasised the presentation of results and the process of research over its specific content and impact.     

The fifth field of Ervin Laszlo

Increasingly gaining the attention of evolution theorists and other scientists is the new quantum‐vacuum‐interactive, or QVI‐field theory of Ervin Laszlo. Among other prospective advancements, this theory would add a fifth primary field to the four already identified by physics to account for the existence of the universe and our lives within it. As the physics and other matters involved make this new theory difficult for those other than physicists to understand, this account is written to provide a guide for the generalist and lay person.     

Evolution,green beards,and skin hue wage discrimination

This paper provides an evolutionary rationale for both interracial and intraracial wage differentials by examining the implications of white employers mediating their employer‐employee relationships on the basis of genetic similarity. If in organized labor markets; relationships mediated through genetic similarity are optimal in terms of Darwinian fitness, a fundamental evolutionary implication is that the Marginal Rate of Substitution (MRS) in Darwinian fitness holding extended fitness constant equals the MRS in preferences holding utility constant. Given such an evolutionary equilibrium, results are derived showing that the strength of tastes for discrimination depends upon the skin hue of non‐white workers. The rationale established for racial wage differentials is that where skin hue serves to indicate genetic similarity between employer and employee, wage differentials emerge that are a function of skin hue.     

Early family context and development of adolescent ruminative style: Moderation by temperament

We know very little about the development of rumination, the tendency to passively brood about negative feelings. Because rumination is a risk factor for many forms of psychopathology, especially depression, such knowledge could prove important for preventing negative mental health outcomes in youth. This study examined developmental origins of rumination in a longitudinal sample (N=337; 51% girls) studied in preschool (ages 3½ and 4½ years) and early adolescence (ages 13 and 15 years). Results indicated that family context and child temperament, assessed during the preschool period, were risk factors for a ruminative style in adolescence. Specifically, early family contexts characterised by over-controlling parenting and a family style of negative-submissive expressivity predicted higher levels of later rumination. These associations were moderated by children's temperamental characteristics of negative affect and effortful control. Further, the interaction of these temperament factors exerted an additional influence on later rumination. Implications for prevention and intervention efforts are discussed.     

The political pluralisation of American evangelicals: how old media built a movement,and why the Internet is poised to change it

Although religious movements are a powerful force in politics, there has been relatively little work that adequately analyses the relationship between communication technologies and Christian political mobilisation in the United States. In addressing this deficit, this article has three interrelated objectives. First, it traces the impact of media technology on the evangelical project, paying specific attention to radio and television, and argues that these two media have had a largely unifying influence. Second, it seeks a better understanding of the impact of the Internet upon evangelical organisations by reviewing relevant academic literature in the context of on-the-ground developments. In doing so, the authors argue that instead of working to facilitate greater unity among evangelicals, as radio and television did in the past, the Internet is instead fragmenting and polarising them. Third, and more speculatively, they discuss implications for a fragmented evangelical community, and call upon scholars to conduct more research into recent developments in communications technology as it relates to Christian political mobilisation in the United States. Combined, these goals work to illustrate the complex relationship between media, religious organisations, and mass political mobilisation.     

Development of Infant Positive Emotionality: The Contribution of Maternal Characteristics and Effects on Subsequent Parenting

The current study examined the influence of maternal characteristics on the development of infant smiling and laughter, a marker of early positive emotionality (PE) and how maternal characteristics and the development of infant PE contributed to subsequent maternal parenting. One hundred fifty‐nine mothers with 4‐month‐old infants participated. Maternal characteristics were assessed 4 months postpartum, infant smiling and laughter were assessed at 4, 6, 8, 10 and 12 months postpartum, and maternal negative parenting was assessed 18 months postpartum. Latent growth modelling was used to test hypotheses regarding the influence of maternal characteristics on the development of infant smiling and laughter, and the contribution of infant smiling and laughter to later maternal parenting. Higher maternal effortful control and PE predicted more initial infant smiling and laughter, whereas more maternal parenting stress predicted lower slopes of infant smiling and laughter. More frequent/intense symptoms of maternal depression predicted higher scores on a measure of negative parenting, whereas higher maternal PE and better effortful control predicted lower negative parenting scores. After accounting for maternal characteristics, higher intercepts and slopes of infant smiling and laughter predicted fewer reports of negative parenting practices. The implications of these findings for future research are discussed. Copyright © 2013 John Wiley & Sons, Ltd.     

Attention Deficit Disorder,Anxiety Disorder,and Learning Disabilities

Abstract

This article details an individualized psychoeducational model designed to treat a child with interrelated psychological and developmental issues whose psychic functioning was deteriorating within the traditional educational system. The team had leeway to function outside of the educational system to create an individualized, remedial, psychoeducational program. At the time we began the program, her diagnostic picture included: Anxiety Disorder, Attention Deficit/Hyperactivity Disorder, and Learning Disabilities. The treatment team consisted of an education specialist, two additional part-time teachers, a clinical social worker, an occupational therapist, a consulting senior child psychoanalyst, and the child's mother. The results at the close of the first school year are examined. Perspectives informing the psychoanalytic aspects of this case include Winnicottian and Fairbairnian Object Relations Theory and therapeutic milieu model.     

Therapeutic Use of Space

ABSTRACT

The project described in this article addresses the therapeutic use of physical space in an outpatient counseling facility. It was theorized that an improved facility environment could be used as a practice tool when working with a vulnerable population. The authors undertook the project with limited time and finances. The process of the change project is discussed in detail in an attempt to encourage other counseling facilities and social service agencies to consider such an effort. Related literature from varied fields is reviewed. The article also relays client and staff feedback regarding the redecorated space and addresses design considerations such as the relative strengths and drawbacks to involving clients and staff in the process.     

Immigrant Children in Austria

ABSTRACT

As a consequence of worldwide waves of immigration there is a permanent increase of ethnically mixed school classes in countries all over the world. However, there is a lack of empirical studies on interethnic relationships which differentiate immigrant children based on their countries of origin. The present paper focuses on these topics and provides data of both negative and positive aspects of interethnic interactions. Direct and indirect forms of bullying, friendship patterns, and peer acceptance in 326 native and 242 immigrant children aged 11 to 14 (57% native Austrian, 22% former Yugoslavian, 14% Turkish/Kurdish, 7% rest group) in 29 ethnically mixed school classes (6th and 7th grades) were examined. Bullying was measured via the Olweus Bully/Victim Questionnaire and via peer nomination techniques, friendship patterns via self-ratings. Peer acceptance was defined by social preference scores on positive and negative sociometric items. According to peer ratings Austrian children were found to be more often victims (9%) and bullies (12%) of direct bullying than immigrant children. Prevalence rates in immigrant children varied depending on their country of origin between 2% and 8% for victims and 3% to 7% for bullies. Results suggested that Turkish/Kurdish children are at risk concerning their social integration in class (e.g., they had the fewest number of friends in class, reported higher levels of loneliness at school, and were less accepted by their peers compared to Austrians and former Yugoslavian children). Friendship patterns differed considerably between native children and children of the three immigrant groups. Findings are discussed concerning differences in integration strategies of immigrant children depending on their country of origin.