Fracture through cavitation in a metallic glass

The fracture surfaces of a Zr-based bulk metallic glass exhibit exotic multi-affine isotropic scaling properties. The study of the mismatch between the two facing fracture surfaces as a function of their distance shows that fracture occurs mostly through the growth and coalescence of damage cavities. The fractal nature of these damage cavities is shown to control the roughness of the fracture surfaces

Non-classroom special education effectiveness for students with severe developmental, emotional and behavioral disorders

AbstractFew studies exist on the effectiveness of special education day treatment for student youth with emotional and behavioral disorders so severe that they cannot be educated in a day treatment setting. Case studies were performed with two youth who had failed previous special education and day treatment programs. Youth participated in a special education program in a private, non-profit, behavioral health and education agency. Unique to this program were the non-traditional, non-classroom based components of education and therapies. Comprehensive, interdisciplinary interventions resulted in progress for these two youth in areas of medical health, violent /aggressive behavior, communication and social skills, community involvement and educational skills. Additional study needs to be performed on more students along with empirical testing of specific interventions with comparison cases

Emotional distress in infertile women and failure of assisted reproductive technologies: meta-analysis of prospective psychosocial studies

Objective To examine whether pretreatment emotional distress in women is associated with achievement of pregnancy after a cycle of assisted reproductive technology

Developmental associations between victimization and body mass index from 3 to 10 years in a population sample

In the current prospective study, we investigated (1) whether high and low BMI in early childhood puts a child at risk of victimization by their peers, and (2) whether being victimised increases BMI over the short- and long-term, independent of the effect of BMI on victimization. We also examined whether gender moderated these prospective associations. Participants were 1344 children who were assessed yearly from ages 3 -10 years as part of the Québec Longitudinal Study of Child Development (QLSCD). BMI predicted annual increases in victimization for girls aged 6 years and over; for boys aged 7 and 8 years of age, higher BMI reduced victimization over the school year. Further, victimization predicted annual increases in BMI for girls after age 6 years. When these short-term effects were held constant, victimization was also shown to have a three and five-year influence on annual BMI changes for girls from age 3 years. These short- and long-term cross-lagged effects were evident when the effects of family adversity were controlled. The findings support those from previous prospective research showing a link between higher BMI and victimization, but only for girls. Further, being victimised increased the likelihood that girls would put on weight over time, which then increased future victimization. The implications of these prospective findings for interventions are considered

Predicting change in academic achievement : a model of peer experiences and self-system processes

The purpose of this study was to test a model of peer experiences and academic achievement among elementary school children. This model postulates that the quality of children's social relations (e.g., social preference) in the peer group can foster or inhibit feelings of connectedness (e.g., loneliness), which in turn affects children's perceptions of academic competence. Finally, perceptions of academic competence are hypothesized to predict change in academic achievement. Participants were 397 school children (206 girls, 191 boys; mean age = 108 months, range = 88–157 months). Results from structural equation modeling provided support for the proposed model. Discussion centers on the mediational role of self-system processes between children's social relations and change in academic achievement

Possible Indication of Narrow Baryonic Resonances Produced in the 1720-1790 MeV Mass Region

Signals of two narrow structures at M=1747 MeV and 1772 MeV were observed in the invariant masses M_{pX} and M_{\pi^{+}X} of the pp->ppX and pp->p\pi^{+}X reactions respectively. Many tests were made to see if these structures could have been produced by experimental artefacts. Their small widths and the stability of the extracted masses lead us to conclude that these structures are genuine and may correspond to new exotic baryons. Several attempts to identify them, including the possible "missing baryons" approach, are discussed.Comment: 17 pages including 8 figures and 3 tables. ReVte

Conceptual models for describing virtual worlds

A conceptual model of a virtual world is a high-level representation of how the objects behave and how they are related to each other. The conceptual models identify the most essential elements of the reality to be simulated. This is the first and a very important step in the process of designing a virtual world. Afterwards, specific and complex models can be implemented and inserted into these conceptual models. This paper provides an overview of existing conceptual models used to design virtual worlds. A number of existing frameworks and architecture for describing virtual worlds are classified into six kinds of conceptual models: unstructured, graphic-oriented, network-oriented, object-oriented, environment-oriented and relational graph-oriented representations. The advantages and issues regarding virtual world design, management, reusability and interoperability are discussed

Subjective Assessment of Sleep Quality Across the Menstrual Cycle in Women with Premenstrual Dysphoric Disorder

Existing evidence demonstrates that sleep structure varies across the menstrual cycle in healthy women (1). These variations could be more severe in women suffering from premenstrual dysphoric disorder (PMDD) (2). In a previous study of healthy women, subjective sleep quality was shown to be constant across both phases of the menstrual cycle (3). The current study aims to test whether there exists a variation in subjective sleep quality of PMDD sufferers across the follicular and luteal phases of the menstrual cycle