Kinetic-ballooning-mode turbulence in low-average-magnetic-shear equilibria

Kinetic-ballooning-mode (KBM) turbulence is studied via gyrokinetic flux-tube simulations in three magnetic equilibria that exhibit small average magnetic shear: the Helically Symmetric eXperiment (HSX), the helical-axis Heliotron-J and a circular tokamak geometry. For HSX, the onset of KBM being the dominant instability at low wavenumber occurs at a critical value of normalized plasma pressure $\beta ^{\rm KBM}_{\rm crit}$ that is an order of magnitude smaller than the magnetohydrodynamic (MHD) ballooning limit $\beta ^{\rm MHD}_{\rm crit}$ when a strong ion temperature gradient (ITG) is present. However, $\beta ^{\rm KBM}_{\rm crit}$ increases and approaches the MHD ballooning limit as the ITG tends to zero. For these configurations, $\beta ^{\rm KBM}_{\rm crit}$ also increases as the magnitude of the average magnetic shear increases, regardless of the sign of the normalized magnetic shear. Simulations of Heliotron-J and a circular axisymmetric geometry display behaviour similar to HSX with respect to $\beta ^{\rm KBM}_{\rm crit}$ . Despite large KBM growth rates at long wavelengths in HSX, saturation of KBM turbulence with $\beta > \beta _{\rm crit}^{\rm KBM}$ is achievable in HSX and results in lower heat transport relative to the electrostatic limit by a factor of roughly five. Nonlinear simulations also show that KBM transport dominates the dynamics when KBMs are destabilized linearly, even if KBM growth rates are subdominant to ITG growth rates.

Commentary on a “unified approach to behaviours that challenge”: getting it right? A family carer perspective

Purpose The purpose of this paper is to provide an individual family-carer perspective on navigating the complex child, adult, education, health and social care systems focussing on what might be needed to get the right support in the right place at the right time for individuals with learning disabilities who display behaviour that challenges. Design/methodology/approach This is a conceptual analysis, drawing on lived experience, policy and practice. Findings Policy and best practice advocate a holistic, person-centred, outcome-focussed approach to supporting individuals with learning disabilities whose behaviour challenges, but the existing complex multiple organisational structures are not conducive to delivering this. Making the system work for people requires focussed leadership across all levels to co-ordinate and align the component parts. It is certainly possible to achieve, but it is currently unclear who will take responsibility for making this happen. Originality/value Families are often the only constant in the lives of people with disabilities. This commentary highlights what is important to and for families when attempts are made to get the right support in the right place at the right time for individuals with learning disabilities who display behaviour that challenges.

Advantages of social skills for contest resolution

Animal contests are natural interactions that occur to obtain or defend resources such as food and territory. Selection should favour individuals that can win contests with minimal costs in terms of energy expenditure or injuries. We hypothesized that social skills contribute to animals' assessment abilities in a contest situation and thereby will shorten contest duration. Animals were either raised in early life conditions stimulating the development of social skills, termed socialization or not (control). Contests between 342 pigs at eight weeks old (171 dyads) were studied for opponent assessment ability (using a game theoretical approach), examining duration and escalation, social behaviours performed, injuries and outcome. Contesting dyads were from the same treatment group and varied in body weight, a validated measure of resource holding potential (RHP). Socialized animals had shorter contests that were resolved with fewer injuries and they showed more ritualized display behaviour, consistent with mutual assessment. Furthermore, there was evidence of a novel form of opponent assessment in the socialized group revealed by a positive relationship between winner RHP and fight duration. In conclusion, social skills enabled more rapid establishment of dominance relationships at lower cost. Besides its evolutionary relevance, these findings may also contribute towards improving animal welfare.

The Widening Circle: Honour, Shame, and Collectivism in the Parable of the Prodigal Son

This study presents a reading of Jesus’ parable of the Prodigal Son through the context of collectivism. After a brief survey of how honour and shame function in a collectivistic society, the essay examines the parable using Luke’s expressed occasion of the story as a starting point. The three characters are examined, as each display behaviour that is outside the accepted norms of Jewish and Greco-Roman society. The study reveals that a major element of the message of Jesus lies in the re-definition of boundaries. The Lukan Jesus remarkably does not abolish the community-first value of the Pharisees and scribes, but upholds the priority of the collective through expanding the boundaries of those who are honoured. The parable is then situated into the grand Lukan narrative, showing how the Jesus movement as described in Luke-Acts widens the circle of the collective.

The brown anole dewlap revisited: do predation pressure, sexual selection, and species recognition shape among-population signal diversity?

Animal signalling structures are amongst the most variable characteristics, as they are subjected to a diversity of selection pressures. A well-known example of a diverse signalling system in the animal kingdom is the dewlap ofAnolislizards. Dewlap characteristics can vary remarkably among and within species, and also between sexes. Although a considerable amount of studies have attempted to disentangle the functional significance of the staggering dewlap diversity inAnolis, the underlying evolutionary processes remain elusive. In this study, we focus on the contribution of biotic selective pressures in shaping geographic variation in dewlap design (size, colour, and pattern) and dewlap display behaviour at the intraspecific level. Notably, we have tried to replicate and extend previously reported results hereof in both sexes of the brown anole lizard (Anolis sagrei). To do this, we assembled a dataset consisting of 17A. sagreiheterogeneous island populations from the Caribbean and specifically tested whether predation pressure, sexual selection, or species recognition could explain interpopulational variation in an array of dewlap characteristics. Our findings show that in neither males nor females estimates of predation pressure (island size, tail break frequency, model attack rate, presence of predatoryLeiocephaluslizards) or sexual selection (sexual size dimorphism) could explain variation in dewlap design. We did find thatA. sagreimales from larger islands showed higher dewlap display intensities than males from smaller islands, but the direct connection with predation pressure remains ambiguous and demands further investigation. Last, we could show indirect support for species recognition only in males, as they are more likely to have a ‘spotted’ dewlap pattern when co-occurring with a higher number of syntopicAnolisspecies. In conclusion, we found overall limited support for the idea that the extensive interpopulational variability in dewlap design and use inA. sagreiis mediated by variation in their biotic environment. We propose a variety of conceptual and methodological explanations for this unexpected finding.

Assessing Personality–Situation Interplay in Personnel Selection: Toward More Integration into Personality Research

Over the years, the personnel selection field has developed methods to assess trait expression in particular situations, but these approaches have evolved mostly outside the field of personality psychology. In this article, I review available personnel selection evidence regarding two such approaches: (i) situational judgement tests that present short scenarios and ask job candidates how they would handle the situations and (ii) assessment centre exercises requiring candidates to display behaviour in specified interactive situations. I describe these approaches and discuss their relations with personality research. I posit that adapting these approaches to personality research creates methodological diversity to address key research themes related to within–person variability, trait–behaviour links, personality disorders, and personality expression and perception. Copyright © 2017 European Association of Personality Psychology