Clifford代数与Minkowski平面几何

以Clifford代数为工具，讨论Minkowski平面的几何性质，指明应用Clifford代数在计算机上实现Minkowski几何研究的可行性。     

Depending on the kindness of strangers: current national data initiatives and developmental research

This article provides a brief review of current large-scale, longitudinal data collection initiatives focusing on children. These studies will be available for secondary data analyses in the twenty-first century. In addition to child outcome data, process-oriented information is being collected on child-parent interactions, quality of child care, elementary school teacher reports and classroom observations, accessibility and use of health, educational and social services, parental mental health, family violence, fathering, parental residence patterns, income and income sources, child support, employment patterns, and community characteristics. Several of these studies are randomized trials of the efficacy of early childhood intervention services and housing mobility programs. The usefulness of these efforts for exploring policy-relevant issues (child support enforcement, work requirements for welfare recipients, antipoverty strategies, housing subsidies and relocation, availability of child care, child-care subsidies) are discussed.     

Professional ideology and physicians’ perceived disclosure patterns toward cancer patients

This study examined differences in physicians’ perceptions of their disclosure patterns toward cancer patients based on their professional ideological orientation. Adapting Strauss et al.’s (1964) sociotherapeutic (SCT) and somatotherapeutic (SMT) ideologies, it was hypothesized that physicians who strongly identified with the SCT ideology would perceive themselves as more willing to disclose the diagnosis to cancer patients and that there would be differences in the way and types of information presented depending on physicians’ ideological orientation. The findings suggest that physicians perceive choosing particular disclosure patterns based, in part, on their professional ideological orientations. Those who identify with a strong SCT orientation perceive themselves as more willing to disclose the diagnosis and provide some additional information to cancer patients and their families. Implications of these findings and directions for future research are discussed.     

Prolegomena to the Study of Personality by Physical Educators

On the premise that profession does not know where it stands in regard to the developing body of knowledge in the many subdisciplinary and subprofessional aspects of sport and physical education, it is recommended that an inventory of scientific finding arranged as ordered generalizations be developed to help the field's many professional practitioners — be it as teacher, coaches, performers, scholars and researchers, superviosor, or administrators. This paper discusses the 20th century development of the field. Based on this development, the discussion will consider what a comprehensive taxonomy of the profession's knowledge base should include, how a plan was formulated for an inventory of scientific finding and how that inventory would be constructed, why a systems approach is needed now to consolidate the evolving profession's future status and what is needed as the profession develops in the next few years. A concluding statement explains that this golden opportunity to achieve true professional status must be exploited very soon or it may never be available again.     

Learning,Theories of Learning,and Units of Analysis in Research

Over the past decades research on learning has become more diverse and complex. The concern expressed by Alexander, Schallert, and Reynolds (2009 Alexander, P. A., Schallert, D. L. and Reynolds, R. E. 2009. What is learning anyway? A topographical perspective considered. Educational Psychologist, 44: 176–192. this issue[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]/this issue) is that this diversity of theoretical perspectives has resulted in a fragmentation that is destructive to the field. Although it is important to engage in explicit discussions of how learning is construed in different traditions, Alexander et al. do not give sufficient recognition to the significant epistemological and theoretical differences between traditions; differences that make them incompatible in important respects, for instance, with respect to their units of analysis. An acceptance of incompatibilities in perspectives is not necessarily a problem. In fact, such a situation may, if the debates are grounded in a mutual acceptance of the diverse manners in which knowing and learning may be theorized, give us a richer frame of reference from which to analyze learning in its various manifestations in complex societies.     

Intergenerational continuity in child maltreatment: mediating mechanisms and implications for prevention

In the interest of improving child maltreatment prevention, this prospective, longitudinal, community-based study of 499 mothers and their infants examined (a) direct associations between mothers' experiences of childhood maltreatment and their offspring's maltreatment, and (b) mothers' mental health problems, social isolation, and social information processing patterns (hostile attributions and aggressive response biases) as mediators of these associations. Mothers' childhood physical abuse--but not neglect--directly predicted offspring victimization. This association was mediated by mothers' social isolation and aggressive response biases. Findings are discussed in terms of specific implications for child maltreatment prevention.     

Enhancing the Transition to Kindergarten: A Randomized Trial to Test the Efficacy of the "Stars" Summer Kindergarten Orientation Program

This randomized trial tested the efficacy of an intensive, four-week summer program designed to enhance low-income children's transition to kindergarten (n's = 60 program children, 40 controls). Administered in four public schools, the program focused on social competence, pre-literacy and pre-numeracy skills, school routines, and parental involvement. Hierarchical linear modeling indicated that the program significantly improved teachers' ratings of (a) the transition to the social aspect of kindergarten for girls (but not boys); and (b) the transition to kindergarten routines for the subgroup of children who had the same teacher for kindergarten as for the summer program. Findings are discussed in terms of practices and policies for supporting children's transition to school.