We introduce a new problem in the study of doubling spaces: Given a point set S and a target dimension d∗, remove from S the fewest number of points so that the remaining set has doubling dimension at most d∗. We present a bicriteria approximation for this problem, and extend this algorithm to solve a group of proximity problems.

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 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...

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...

the how and why of tehran development and construction of its citadel has always been of interest to researchers. at the same time, issues such as its time of obtaining importance and prosperity on the one hand, and establishing and appellation of its citadel as the most important official complex of the qajar period on the other, are among the concerns mostly ignored by the scholars. addressin...

Background: Safety of contractors is one of the key safety challenges at construction. Safety training, as an essential prerequisite for achieving safety qualification certificates by contractors, could decrease accident rates in the construction. This study aims to evaluate the effectiveness of training construction contractors in safety issues in minimizing occupational accidents in a five-ye...

In this work, to scientifically predict the color of damaged Korla fragrant pears during storage period with lower economic loss and improved added value pears, eight pericarp prediction models were established. These had different membership functions, which based on adaptive neuro-fuzzy inference system (ANFIS). The optimal model was chosen verified. Finally, accurately predicted through degr...