Sign determination of the 57 Fe electric-field gradient in Al-based crystals and icosahedral quasicrystals

Abstract

The icosahedral quasicrystals i-AIMn, isomorphically substituted by 28 at.% Fe or by a mixture of (CrFe) atoms, have been studied for the first time by in-field Mössbauer spectroscopy in order to determine the sign and asymmetry parameter of the dominant electric-field gradient (EFG) term. In addition, the orthorhombic o-Al(MnFe) and cubic α- and hexagonal β-Al(MnFe)Si crystalline phases have been studied. We show that the previous Mössbauer results are inadequate for determining whether there are two sites in the quasicrystalline structure in the ratio of the golden number. Our results for i-Al(MnFe) show that the dominant EFG is negative, with an asymmetry parameter of about 0·6. For i-Al(CrFe), essentially no deviations are found from the model of Czjzek or the Gaussian isotropic model. One crystalline phase, the hexagonal β phase, is found to have a very similar quadrupole effect to that found in i-Al(MnFe). In addition it is found that this phase undergoes a change which is at least partly of magnetic origin.     

Psychological intervention with couples coping with breast cancer: A systematic review

Objective: Information about psychological intervention with couples coping with breast cancer is not well-disseminated. This can be explained, at least in part, by the absence of knowledge about the efficacy of this kind of intervention. The aim of the present systematic review is to identify and describe psychological interventions for couples coping with breast cancer and evaluate their efficacy.

Design: Studies identified by a searching multiple literature databases related to health and psychology between 1975 and 2013. Rigorous inclusion and exclusion criteria were utilised.

Results: Of 129 abstracts, 13 were extracted for further analysis and a final ten studies were deemed eligible for inclusion. Data were extracted from each study regarding study sample characteristics, design, results and methodological limitations. The results obtained were mixed in regard to efficacy, although the overwhelming majority of studies (eight studies) found benefits for both women and their partners in some dimensions, such as quality of life, psychological distress, relationship functioning and physical symptoms associated with cancer.

Conclusion: Psychological interventions for couples coping with breast cancer appear to be effective for both women and their partners. However, further studies are needed to evaluate the efficacy of couple-based interventions and, to identify for whom and how they are more effective.     

A Qualitative Exploration of Rural African American Youth Perceptions about the Effect of Dating Violence on Sexual Health

Adolescent dating violence (ADV) remains a significant concern, particularly among rural African Americans. Few studies have explored adolescents’ perceptions about the link between ADV and sexual health and none have targeted this population. Employing qualitative methods based in Community-Based Participatory Research and theory, this study explored rural African American adolescents’ knowledge, perceptions and beliefs about the impact of ADV on sexual health. Secondary data analysis of 20 semi-structured individual interviews, conducted with older adolescents (aged 18–21), revealed participants understood the link between ADV and sexual health consequences, specifically as it related to STI and HIV prevention, condom use, and refusal of sex; and the negative impact refusing sex, communicating about HIV and other STI prevention, and negotiating condom use can have on ADV. This included: (a) negative relationship outcomes, including ADV and fear; and (b) factors that impact one’s ability to refuse sex, communicate about HIV and STI prevention, and negotiate condom use. Findings underscore the need for comprehensive ADV prevention programs for rural African Americans.     

Cross-sex versus same-sex experience and relationship satisfaction: addressing diverse social networks among Orthodox Jews

Romantic experiences in adolescence often predict relationship stability and marital status in adulthood. Religious practice and belief also have been linked to increased marital satisfaction and overall wellbeing. However, certain religions limit cross-sex interaction in areas of education, social and romantic relationships. Although gender segregation has been studied in educational and occupational contexts, no previous research has addressed religious gender segregation and its impact on relationship development, marital satisfaction, and overall wellbeing. The present study addressed the generalisability of data on cross-sex experience derived from normative populations to a religious subculture, outlining predictors for marital satisfaction and wellbeing in an Orthodox Jewish sample. Results showed some similarities between the general population and the Orthodox Jews represented by the study sample. However, some factors illustrated divergent paths and outcomes for this sample. This study demonstrates the influence of societal norms and the importance of addressing cultural context when evaluating marital satisfaction.     

Depth of Field: Using photographs and narratives to explore and reflect on ageing

The learning landscape of the higher education environment is changing, with an increased focus over the past decade on how educators might begin to cultivate reflective skills in health professions students. In addition, changing professional requirements demand that health professionals are adequately prepared to practise in today’s complex healthcare systems, including responding to changing demographics of population ageing. In this educational case study, we will share how we (a group of education, medical and nursing academics) developed ‘Depth of Field: Exploring Ageing’ a digital, consumer-driven, interprofessional reflective learning resource that uses photographs, narrative and small-group work to strengthen reflective capacity in current and/or future health professionals.     

The Development of Hyperactive–Impulsive Behaviors During the Preschool Years: The Predictive Validity of Parental Assessments

The objectives of this study were to establish the different developmental trajectories of hyperactive-impulsive behaviors on the basis of both mother and father ratings at 19, 32, 50, and 63 months, and to examine the predictive validity of these trajectories with respect to later hyperactive-impulsive behaviors, as rated by teachers in the first 2 years of school. Hyperactive-impulsive behaviors were assessed in a population-based sample of 1,112 twins (565 boys and 547 girls) at 19, 32, 50, and 63 months of age. The results revealed a differentiated and consistent view of developmental trajectories of hyperactive-impulsive behaviors derived from these repeated assessments, with 7.1% of children seen by mothers (7% for fathers) as displaying high and stable hyperactive-impulsive behaviors. According to mother ratings, children on a high-chronic trajectory were more likely than other children to display hyperactive-impulsive behaviors at 72 and 84 months according to their teachers. Repeated measures over time and father-based trajectories significantly added to the prediction teacher later ratings of hyperactive-impulsive behaviors. These results support the predictive validity of parental assessment of hyperactive-impulsive behaviors during the preschool years and their use to identify children at risk for further evaluation and possible intervention.