Social Cognitive Factors,Support, and Engagement: Early Adolescents’ Math Interests as Precursors to Choice of Career

The authors examined the central hypothesis that students’ early perceptions of support and sense of engagement in math classes and math activities strongly influence the broadening or narrowing of their math interest. The focus was on the first wave of qualitative data collected from 5th‐, 7th‐, and 9th‐grade students during the 2007–2008 academic year as part of a longitudinal study. Findings indicate the importance of using group work and extrinsic motivation in middle school math classes to broaden interest; peer classroom behavior was often a detractor of math interest.     

Monogamy,the Protective Fallacy: Sexual versus Emotional Exclusivity and the Implication for Sexual Health Risk

The authors examined the hypothesis that many individuals define monogamy based on emotional rather than sexual fidelity. Participants, 373 heterosexual college students and 282 gay men, read three vignettes of decreasing mitigation in which they imagined committing an act of infidelity against a hypothetical partner and where half the participants were cued to their emotional attachment toward the partner. Despite the infidelity, relationships in the emotional attachment–cued vignettes were rated as monogamous to a greater degree than relationships in the vignettes where emotional attachment was not cued. In addition, over one-third of the participants in our study reported infidelity in their current self-defined monogamous relationships yet also reported feeling more protected from sexual health risks and reported less condom use than individuals who defined their relationship as nonmonogamous. The implications for monogamy as a protective fallacy are discussed.     

Dynamic heterogeneity: a framework to promote ecological integration and hypothesis generation in urban systems

Urban areas are understood to be extraordinarily spatially heterogeneous. Spatial heterogeneity, and its causes, consequences, and changes, are central to ecological science. The social sciences and urban design and planning professions also include spatial heterogeneity as a key concern. However, urban ecology, as a pursuit that integrates across these disciplines, lacks a theoretical framework that synthesizes the diverse and important aspects of heterogeneity. This paper presents the concept of dynamic heterogeneity as a tool to explore how social and ecological heterogeneities interact and how they together act as both an outcome of past interactions and a driver future heterogeneity and system functions. To accomplish this goal, we relate heterogeneity to the fundamental concept of the human ecosystem. The human ecosystem concept identifies key processes that require operationalized models of dynamic heterogeneity in three process realms: the flow of materials, the assembly of urban ecosystem biota, and the locational choices humans make concerning land. We exemplify a specific dynamic model of heterogeneity in each of these realms, and indicate a range of complementary statistical approaches to integrate the drivers and outcomes of dynamic heterogeneity across the three realms. We synthesize a hierarchical framework for a theory of dynamic urban heterogeneity, noting its complementarity to other major urban theories and general model approaches. We hypothesize that human actions and structures amplify the dynamics of heterogeneity in urban systems.     

Diffusion in the Face of Failure: The Evolution of a Management Innovation

Recent work has questioned the institutional model of management innovation by highlighting interactions between the field‐level actors engaged in diffusing innovations and implementation of the innovation at organization level. Focusing on the adaptation of management innovations to their context, rather than their creation, we review this work and use it to analyse the global diffusion of resource planning (RP), counter posing this case with the widely studied example of total quality management. Both of these innovations experienced a high level of failure when implemented by organizations. Total quality management's diffusion was characterized by a ‘boom and bust’ cycle. RP, however, has continued to spread globally in the form of its variants: MRP, MRPII and ERP. Our analysis seeks to account for the long‐run diffusion of RP through a processual model which highlights the interplay between RP's discursive framing at field level, the affordances of the innovation itself and its adaptation within organizations. This demonstrates how objectifying RP in software not only helped to spread the innovation but also allowed field‐level actors to differentiate its development as a successful innovation from the many failures experienced by organizations attempting to adapt it.     

Association of Personal Distress With Burnout,Compassion Fatigue,and Compassion Satisfaction Among Clinical Social Workers

ABSTRACT

Studies of empathy and empathy-related responding show that while some people respond to observing the suffering of another with a prosocial concern and urge to help the suffering person, others have an aversive, avoidant response that is primarily self-focused and aimed toward relieving their own distress rather than helping the other person. This self-focused response, labeled personal distress, is associated with various social and psychological problems. This article discusses the concept of personal distress and describes a study of licensed clinical social workers (n = 171) that examines the relationship of personal distress and three other aspects of the empathy construct with compassion fatigue, burnout, and compassion satisfaction. Results of ordinary least squares multiple regression analyses indicate that the model of empathy components and control variables explain 20% to 23% of the variance in the dependent variables. Personal distress is the only component of the empathy construct with significant associations with the dependent variables. Higher personal distress is associated with higher compassion fatigue and burnout and lower compassion satisfaction among clinical social workers. Implications for future research and for social work education are discussed.     

A concept of an integrated transport model

This paper is one of a series being produced on the application of Operational Research techniques in the integrated planning of public service resource provision and consumption. It describes a conceptual basis for planning transportation services within the context of a public service, the others are related to Health Services, Educational Services and community development services.Two sub-models, a linear sub-model and a dynamic sub-model are linked to form the integrated approach to the planning problem. The overall concept is to evaluate in terms of penalties and benefits the alternative plans of resource provisions.It is of interest to know that the principles of the Linear model described here has been applied to long range planning in the Health Service in the U.S.A. and U.K., and has been reported at the NATO conference, Portugal (1974). The Dynamic model has been used, in a more unstructured fashion than described here, by the Greater London Councils. The model in this paper is to form the basis of a more detailed evaluation of alternative transportation plans.     

原子簇的合成方法、性质表征与结构

利用给电子有机和无机配位体的交换反应和金属卤化物与羰基金属阴离子的复分解反应,合成异核原子簇具有反应条件温和易于控制,收率较高的特点。本文描述Fe_3(CO)_9(C_2H_2)_3等11个原子簇的合成方法,配位状态与簇核的结构。     

Evaluation of Linear Mixed Model Case Deletion Diagnostic Tools by Monte Carlo Simulation

A large number of statistics have been proposed to study the influence of individual observations in the linear mixed model. An extensive Monte Carlo simulation study is used to evaluate the appropriateness of these influence diagnostic measures. The sensitivity of the diagnostic measures to outliers and leverages is examined, and helpful results are obtained.