We introduce a novel approach towards Harnack’s inequality in the context of spaces of homogeneous type. This approach, based on the socalled critical density property and doubling properties for weights, avoids the explicit use of covering lemmas and BMO.

The past few years have witnessed an increasing interest in nutrition interventions, which have emerged as a key matter to achieve MDGs. While political commitment is widely spread, more needs to be done to improve operational capacity. This article, resulting from the Landscape Analysis Country Assessment, provides an overall picture of Burkina Faso’s nutrition situation and outlines the steps...

This paper defines online communities and their constituent elements. It provides a framework in which online communities can be discussed and compared irrespective of topic or content. It explores the notions of core and peripheral membership and behaviour and provides a set of metrics for determining the activity profile of the community. Finally it presents a case study of an online communit...

The accuracy of time-to-contact (TTC) judgments for single approaching objects is well researched, however, close to nothing is known about our ability to make simultaneous TTC judgments for two or more objects. Such complex judgments are required in many everyday situations, for instance when crossing a multi-lane street or when engaged in multi-player ball games. We used a prediction-motion p...

This historical study utilizes annual insured bank data from 1936 through 1989 to empirically evaluate the impact of bank regulation on bank risk taking in a cross-country comparison of the United States and Canada. Risk is hypothesized to be determined, in part, by the regulatory environment in which a bank operates. The findings of this analysis contributes to the contemporary deregulation po...

The authors describe ACT-R/perceptual-motor (ACT-R/PM), an integrated theory of cognition, perception, and action that consists of the ACT-R production system and a set of perceptual-motor modules. Each module (including cognition) is essentially serial, but modules run in parallel with one another. ACT-R/PM can model simple dual tasks such as the psychological refractory period (PRP), includin...

We give new examples of discrete Schrδdinger operators with potentials taking finitely many values that have purely singular continuous spectrum. If the hull X of the potential is strictly ergodic, then the existence of just one potential x in X for which the operator has no eigenvalues implies that there is a generic set in X for which the operator has purely singular continuous spectrum. A su...

Most studies using the psychological refractory period (PRP) design suggest that dual-task performance is limited by a central bottleneck. Because subjects are usually told to emphasize Task 1, however, the bottleneck might reflect a strategic choice rather than a structural limitation. To evaluate the possibility that central operations can proceed in parallel, albeit with capacity limitations...

Which actions does morality require of us? What does it forbid and what does it permit? In trying to fi nd some general answers to these questions, moral theorists typically start from commonsense morality, from what ordinary people think about moral issues. In deciding how to act, people often think about the consequences of their actions: they try to fi nd the action that leads to the best ov...