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81.
We study the problem of the existence and uniqueness of solutions to the Bellman equation in the presence of unbounded returns. We introduce a new approach based both on consideration of a metric on the space of all continuous functions over the state space, and on the application of some metric fixed point theorems. With appropriate conditions we prove uniqueness of solutions with respect to the whole space of continuous functions. Furthermore, the paper provides new sufficient conditions for the existence of solutions that can be applied to fairly general models. It is also proven that the fixed point coincides with the value function and that it can be approached by successive iterations of the Bellman operator.  相似文献   
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Little information exists on the specific reflective processes that precede therapists' choice of including or not including a structured feedback procedure in their established practice. In the present study, we aim to describe and explore experienced couple and family therapists' expectations for how the comprehensive therapy feedback procedure Systemic Therapy Inventory of Change might influence their practices. Through a thematic analysis of six focus group interviews, two main themes were elicited. The first main theme involved values embedded in current practice, with the following subthemes: (1) balance between the therapist's expert knowledge and the client's experience‐based knowledge; and (2) making time to build alliances. The second main theme concerned the presumed influence on current practice, with the following subthemes: (1) ‘Systemic Therapy Inventory of Change will disturb the therapist's capacity to stay present’; (2) ‘Systemic Therapy Inventory of Change will shape conversations’; and (3) ‘Systemic Therapy Inventory of Change will contribute to increased qualitative depth’. We discuss these results in relation to the notion of Systemic Therapy Invention of Change as a ‘third party in the room’. We also discuss the results in relation to implications for collaborative practices, and for client and therapist autonomy.  相似文献   
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Aid co‐ordination has come to be seen as a miracle cure for the ills of donor proliferation. However, in weak states where aid conditionality may be a catalyst for institutional change, the ideal of aid co‐ordination is conceptually suspect, and in some instances politically counterproductive. Co‐ordination is one of the two solutions to the collective‐action problem that the public good of effective institutional conditionality generates; donor leadership is the other. The desirability of each solution depends on every donor's commitment and presence, which together generate a four‐fold typology: leader, protester, enabler, and spoiler. As long as there is at least one enabler or spoiler donor present, aid co‐ordination will be less effective than donor leadership.  相似文献   
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The “rural paradox” refers to standardized mortality rates in rural areas that are unexpectedly low in view of well‐known economic and infrastructural disadvantages there. We explore this paradox by incorporating social capital, a promising explanatory factor that has seldom been incorporated into residential mortality research. We do so while being attentive to spatial dependence, a statistical problem often ignored in mortality research. Analyzing data for counties in the contiguous United States, we find that: (1) the rural paradox is confirmed with both metro‐nonmetro and rural‐urban continuum codes, (2) social capital significantly reduces the impacts of residence on mortality after controlling for race and ethnicity and socioeconomic covariates, (3) this attenuation is greater when a spatial perspective is imposed on the analysis, (4) social capital is negatively associated with mortality at the county level, and (5) spatial dependence is strongly in evidence. A spatial approach is necessary in county‐level analyses such as ours to yield unbiased estimates and optimal model fit.  相似文献   
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