Interfacial waves between two piezoelectric half-spaces with electro-mechanical imperfect interface

We study the propagation of shear horizontal waves between the interface of two piezoelectric materials with an electro-mechanical imperfect contact. Mechanical and electrical imperfections are modeled by means of a spring and a capacitor, respectively. The corresponding mathematical expressions for the imperfect contact are given in this article. The system of differential equations for the waves in the considered half-space is derived and the associate solutions are found. A general expression for the dispersion relation, not reported previously in the literature, is given in an explicit form, with the diverse limit cases analyzed in detail. In some of these limit cases, new expressions are also obtained, which predict the existence of interfacial waves. In the other cases, where already reported results exist, a comparison with them is done. Some physical interpretations are derived from the limit cases. The influence of mechanical and electrical imperfect contacts are shown in some numerical examples.     

Recalled parental bonding,current attachment,and the triarchic conceptualisation of psychopathy

The current investigation examined whether attachment functioning might mediate the effects of parenting on traits associated with psychopathy. Participants completed the Parental Bonding Instrument, the Experiences in Close Relationships Scale, and the Triarchic Psychopathy Measure within a cross-sectional design. Whilst several recalled parenting variables demonstrated significant correlations with the psychopathy subscales, mediation analyses confirmed that the majority of these effects were mediated by current attachment anxiety and avoidance. Only paternal overprotection maintained a significant direct effect on levels of disinhibition. These findings provide support for the argument that attachment dysfunction may represent a potential mechanism through which parenting practices contribute to the emergence of psychopathy-related traits. Inferences regarding causality and mechanisms of effect are naturally constrained by the cross-sectional design of the current investigation, but the preliminary findings presented warrant further examination within prospective designs.     

The Relationship Among Child Maltreatment,Parental Bonding,and a Lifetime History of Major Depressive Disorder in Latino College Students

This study examined the relationship among child maltreatment, parental bonding, and a lifetime history of major depressive disorder (MDD) in a sample of 119 Latino students. Forty-five students reported a lifetime history of MDD and 74 reported not having a lifetime history of MDD. The results indicated that emotional abuse and maternal overprotection were significantly associated with having a lifetime history of MDD. The findings support the importance of examining these factors among depressed Latinos. Future research should continue to explore both the role of child maltreatment and parental bonding in relation to a lifetime history of MDD in this population.     

Social Capital and Community Group Participation: Examining ‘Bridging’ and ‘Bonding’ in the Context of a Healthy Living Centre in the UK

Social capital has been widely advocated as a way of understanding and building community participation in the interest of health improvement. However, the concept as proposed by Putnam, has been criticised for presenting an overly romanticised account of complex community relations. This paper presents analysis from a qualitative evaluation of a Healthy Living Centre (HLC) in the North of England, to examine the utility of the concept of social capital in this context. We found the concepts of ‘bridging’ and ‘bonding’ social capital were useful – though not without limitations – in helping to make sense of the complexities and contradictions in participants’ experiences of community group participation. 'Bridging' helped provide an understanding of how the decline in shared social spaces such as local shops impacts on social relationships. 'Bonding' highlighted how community group membership can have positive and negative implications for individuals and the wider community. It was found that skilled group leadership was key to strengthening bridging capital. Politically, in the UK, community participation is seen as having an essential role in social change, for example, its centrality to the coalition government's idea of the ‘Big Society’. A micro‐examination of this HLC using the lens of social capital provides a valuable critical insight into community participation. It shows that this kind of initiative can be successful in building social capital, given conditions such as an appropriate setting and effective leadership. However, they cannot substitute for other kinds of investment in the physical infrastructure of a community. Copyright © 2012 John Wiley & Sons, Ltd.     

Reintegrative Shaming Theory, moral emotions and bullying

This article investigates the usefulness of Reintegrative Shaming Theory (RST) in explaining the bullying of siblings in families and peers in schools. Questionnaires were completed by 182 children aged 11-12 years in ten primary schools in Nicosia, Cyprus, about sibling and peer bullying. A vignette-based methodology was used to investigate children's expectations of the type of shaming their parents would offer in response to their possible wrong doing. Children were also asked questions about the emotions they would have felt (i.e. shame, remorse, guilt or anger) if they were in the position of the child in the vignette. The level of bonding toward each parent was also examined. In agreement with the theory, a path analysis showed that mother bonding influenced children's expectations of the type of shaming offered by parents. Disintegrative shaming (i.e. shaming offered in a stigmatizing or rejecting way) had a direct effect on the way children managed their shame. Shame management directly influenced sibling and peer bullying. Father bonding had no direct or indirect effects in the model. Against the theory, reintegrative shaming (i.e. shaming offered in the context of approving the wrongdoer while rejecting the wrongdoing) did not have a direct effect on shame management. Beyond the postulates of RST, mother bonding-a plausible indicator of family functioning-had a direct effect on sibling and peer bullying. Mother bonding had a stronger effect for boys than for girls. It is concluded that RST is useful in explaining the link between family factors and bullying, and that RST has cross-cultural applicability.     

Formation of omega and Ti2Ni phases in a residual Ti–Ni–Ti multilayer between stainless steel and zirconia after bonding at 1173 K

Stainless steel (316L) and 8 mol pct Y₂O₃-stabilized zirconia (8Y-ZrO₂) were bonded using a Ti–Ni–Ti multilayer at 1173 K (900 °C) for 1 h. Cross-sectional transmission electron microscopy specimens were prepared by an innovative focused ion beam plus lift-out technique. In addition to acicular α-Ti, the dissolution of Fe, Cr, and Ni diffusing outwards from 316L into β-Ti led to the precipitation of the omega (ω) phase with different variants in the residual Ti foil between 316L and Ni. The ω-phase was not found in the residual Ti foil between Ni and 8Y-ZrO₂, while Ti₂Ni precipitates were precipitated in some α-Ti grains owing to the exclusion of Ni from the β-Ti.     

Positive experiences of high arousal martial arts rituals are linked to identity fusion and costly pro-group actions

A cross-sectional study was conducted with 605 practitioners of Brazilian Jiu Jitsu (BJJ) to test the hypothesis that high arousal rituals promote social cohesion, primarily through identity fusion. BJJ promotion rituals are rare, highly emotional ritual events that often feature gruelling belt-whipping gauntlets. We used the variation in such experiences to examine whether more gruelling rituals were associated with identity fusion and pro-group behaviour. We found no differences between those who had undergone belt-whipping and those who had not and no evidence of a correlation between pain and social cohesion. However, across the full sample we found that positive, but not negative, affective experiences of promotional rituals were associated with identity fusion and that this mediated pro-group action. These findings provide new evidence concerning the social functions of collective rituals and highlight the importance of addressing the potentially diverging subjective experiences of painful rituals.     

Risk and protective factors for pre- and postnatal bonding

Since disturbances in the mother–child bond increase the risk of negative consequences for child development, it is important to identify risk and protective factors for bonding as well as longitudinal associations. Previous research has used different bonding instruments during pregnancy and the postnatal phase, leading to inconsistent results. In the current study, the same instrument was used during the various phases. In a large, community-based sample (N = 793), general information, feelings of pre- and postnatal bonding (Pre- and Postnatal Bonding Scale), depressive symptoms (Edinburgh Postnatal Depression Scale), and partner support (subscale Tilburg Pregnancy/Postnatal Distress Scale) were measured at both 32 weeks of pregnancy and 8 months postnatally. Partner support was found to be a protective factor for suboptimal pre- and postnatal bonding, as was the engagement with fetal movements for prenatal bonding. High maternal educational level was a risk factor for suboptimal prenatal bonding, as were depressive symptoms for suboptimal postnatal bonding. The associations between most prenatal determinants and postnatal bonding were mediated by prenatal bonding, which underlines the importance of promoting prenatal bonding. Professionals in clinical practice should be aware of partner support, engagement with fetal movements, and postnatal depressive symptoms: All these factors offer opportunities for improving the bonding processes.     

Bonding social capital and collective action: Associations with residents' perceptions of their neighbourhoods

Neighbourhood perceptions have important implications for individual well‐being, yet there is limited research focused on variables that predict these perceptions. This study proposes that previous engagement in collective action mediates the relationship between neighbourhood bonding social capital and neighbourhood perceptions. Structural equation modelling with a large, nationally representative sample (N = 25,370) is used to test the hypotheses. The findings suggest that bonding social capital has a positive, direct effect on both neighbourhood perceptions and collective action. Collective action has a negative, direct association with neighbourhood perceptions and bonding social capital has a negative, indirect effect on neighbourhood perceptions via collective action. Although the full model explains 28% of the variance in neighbourhood perceptions, bonding social capital only explains 5% of the variance in collective action.     

School bonding in children and adolescents: conceptualization,assessment, and associated variables

School bonding refers to the connections that youth have with their schools and various aspects of their academic lives. School bonding may be an important concept in prevention because it has been linked to various developmental and adjustment outcomes. This paper reviews conceptualizations, measurements, and theories of school bonding. Also considered are empirical studies that have linked school bonding to a variety of outcomes (substance use, delinquency, antisocial behavior, self-esteem). The review includes examination of how school bonding serves as a mediator in these relations and, in turn, is moderated by other variables. Despite inconsistencies in conceptualization and measurement, it is concluded that school bonding is an important construct and an appropriate target for intervention. Recommendations are offered regarding future research on school bonding, especially with respect to positive developmental outcomes and examination of variables that might moderate school bonding.