Size effects and Hall–Petch relation in polycrystalline cobalt

The mechanical behaviour of polycrystalline hexagonal close-packed cobalt was investigated over a large range of grain size d in order to examine the occurrence of size effects. Crystallographic texture and amount of face centred cubic allotropic phase were maintained unchanged thanks to appropriate heat treatment procedures. The Hall–Petch (HP) relation exhibits two distinct behaviours from the very beginning of plastic strain levels. The conventional HP law is fulfilled for a number of grains across the thickness t higher than a critical value (t/d)_c = 14. For t/d lower than (t/d)_c, a multicrystalline regime is evidenced highlighting a strong reduction in flow stress. The high value of (t/d)_c is related to the low-stacking fault energy of cobalt in the basal plane. The size effect is predominant in the first work hardening stage where slip mechanisms and stacking faults predominate. In the second stage, driven by mechanical twinning processes, this effect is less sensitive. Finally, the size effect could also affect the end of the elastic stage, in link with nonlinear elasticity mechanisms.     

Congregational Diversity and Attendance in a Mainline Protestant Denomination

One of the surprising oversights of existing research on racially/ethnically diverse congregations is the inattention to how racial composition relates to patterns of attendance. Is diversity associated with attendance growth, stability, or decline? A popular assumption from the Church Growth Movement is that cultural homogeneity is a foundation for growth, but recent research challenges this long‐standing belief. We test these competing views with longitudinal data from over 10,000 congregations in the Evangelical Lutheran Church in America (ELCA). We examine the relationship between changes in racial/ethnic diversity and changes in average weekly attendance over a 19‐year time period (1993–2012). In spite of the ELCA's denominational push for racial diversity in its local churches, our analysis finds increasing racial diversity associated with decreasing average attendance, most notably during the 1990s. To conclude, we discuss the implications of our findings for congregations and denominations.     

Toward ethnocultural diversification of higher education

Attitudes toward ethnocultural diversification in higher education mirror attitudes toward paying taxes. Dissenters are opposed to paying taxes or to ethnocultural diversification. Passive Supporters value the benefits of taxes or ethnocultural diversification, but pay taxes or engage in diversity efforts only when required to do so. Active Supporters pay taxes or support diversity efforts even if they are not required to do so. Mandatory approaches to decrease the resistance of Dissenters to ethnocultural diversification may be necessary, whereas compelling voluntary approaches may be useful to mobilize Passive Supporters. Solutions need to be tailored to the needs of European Americans and persons of color. This article offers a conceptual framework for future research and interventions.     

The evolution of intergroup bias: perceptions and attitudes in rhesus macaques

Social psychologists have learned a great deal about the nature of intergroup conflict and the attitudinal and cognitive processes that enable it. Less is known about where these processes come from in the first place. In particular, do our strategies for dealing with other groups emerge in the absence of human-specific experiences? One profitable way to answer this question has involved administering tests that are conceptual equivalents of those used with adult humans in other species, thereby exploring the continuity or discontinuity of psychological processes. We examined intergroup preferences in a nonhuman species, the rhesus macaque (Macaca mulatta). We found the first evidence that a nonhuman species automatically distinguishes the faces of members of its own social group from those in other groups and displays greater vigilance toward outgroup members (Experiments 1-3). In addition, we observed that macaques spontaneously associate novel objects with specific social groups and display greater vigilance to objects associated with outgroup members (Experiments 4-5). Finally, we developed a looking time procedure-the Looking Time Implicit Association Test, which resembles the Implicit Association Test (Greenwald & Banaji, 1995)-and we discovered that macaques, like humans, automatically evaluate ingroup members positively and outgroup members negatively (Experiments 6-7). These field studies represent the first controlled experiments to examine the presence of intergroup attitudes in a nonhuman species. As such, these studies suggest that the architecture of the mind that enables the formation of these biases may be rooted in phylogenetically ancient mechanisms.     

The contribution of short-term memory for serial order to early reading acquisition: evidence from a longitudinal study

Early reading acquisition skills have been linked to verbal short-term memory (STM) capacity. However, the nature of this relationship remains controversial because verbal STM, like reading acquisition, depends on the complexity of underlying phonological processing skills. This longitudinal study addressed the relation between STM and reading decoding acquisition by distinguishing between STM for item information and STM for order information based on recent studies showing that STM for item information, but not STM for order information, recruits underlying phonological representations. If there is a specific link between STM and reading decoding acquisition, STM for order information should be an independent predictor of reading decoding acquisition. Tasks maximizing STM for serial order or item information, measures of phonological abilities, and reading tests were administered to children followed from kindergarten through first grade. We observed that order STM capacity, but not item STM capacity, predicted independent variance in reading decoding abilities 1 year later. These results highlight the specific role of STM for order in reading decoding acquisition and argue for a causal role of order STM capacity in reading acquisition. Mechanisms relating STM for order information and reading acquisition are discussed.     

The Influence of Family Dynamics on Ethnic Identity Among Adult Latinas

The literature on the development of ethnic identity within the young adult years and during childhood is plentiful. There is less research that examines how this development continues beyond young adult or college years. Research suggests that major life events experienced in adulthood could cause individuals to enter a period of identity reconstruction, yet little is known about this process. Because family and/or familism has been established as an important aspect of Latinos’ identities and lived experiences, this study seeks to examine the dimensions around family dynamics and their potential influences on ethnic identity development processes among adult Latinas. Findings indicate that Latinas often make sense of their ethnic identity when major life events associated with family dynamics occur; such as marriage, childbearing, and negotiating relationships with family members as culture is being transmitted across several generations. These findings have implications for understanding adult education students as well as considering the influence of education on the family dynamics of Latinas.     

Psychological support post-release of humanitarian workers taken hostage: the experience of the International Committee of the Red Cross (ICRC)

ABSTRACT

Following release, former hostages face many challenges and may struggle to regain control over their lives. Research and evidence on how to effectively address the needs of hostages during their release and afterwards is lacking. The International Committee of the Red Cross has extensive experience in managing hostage situations and has strengthened the practice of care offered to its own affected staff by developing an inter-professional comprehensive seven phase care model adapted to incidents of extended duration with multiple stressors. This includes strong coordination between the different actors involved, combined with long-term peer, social and organisational support, as well as workplace reintegration with guidance by colleagues, and specialised counselling when necessary, to ensure positive outcomes, and minimise permanent sequelae.     

Neural Processing to Visual Stimuli in a Three-Choice Reaction-Time Task

Some authors have suggested that certain components of the event-related potentials (ERPs) reflect underlying stages in the discrimination process. Previous studies have shown that in an auditive three-choice reaction-time task the discrimination is accomplished as a two-stage process, with the more frequently occurring stimulus discriminated at an earlier point than the rarer stimulus and the subjects could be classified as fast and slow responders in function of their response to the most frequent of the three tones. We continuously recorded the electrocerebral activity (EEG) from the scalp and the electromyographic activity (EMG) from the responding muscles in a visual three-choice reaction-time task in 10 strictly right-handed subjects. EEG and EMG responses were subsequently analyzed off-line by aligning them by the onset of either the stimulus (stimulus-synchronized) or the response (response-synchronized). The results suggest that processes of visual stimuli evaluation and response execution are continuously integrated. The discrimination and response systems to visual stimuli is accomplished as a three-stage process, one to frequent tone, another for rare 1, and the last for rare 2. The subjects were classified as fast and slow responders in function of their response to the most frequent of the three tones.