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.

This work presents the chronology of Holocene filling Guadalentín Tectonic Depression (Murcia, SE Spain) combining 14C and OSL age data. studies sediments paleosols interbedded in sedimentary sequence between Totana Librilla, using as reference Espuña Karting section (Alhama de Murcia), which has been fully sampled for its geochronological analysis. The entire dated sequences record last c. 20–...

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...

One of the characteristic features Leilatepe archaeological culture Chalcolithic period (end 5th millennium BC - first half 4th BC) is a unique stone product. This was studied mainly on basis monuments in territory Azerbaijan. Extensive excavations were carried out Leilatepe, Beyuk Kesik I, Poylu II, Galayeri settlements belonging to and numerous tools discovered. Similar also discovered as res...

The paper is devoted to the critical analysis of radiocarbon dating results Mesolithic, Neolithic and Chalcolithic complexes northeastern part East European Plain (Republic Komi, Arkhangelsk Vologda Regions Nenets Autonomous Area, Russian Federation). comprehensive evaluation all available geochronometric data in relation with studied archaeological events highlighted following three sets: reli...

Abstract. New research in previously unexplored or poorly documented areas of Greater Mesopotamia has made it possible to define better the chronology and distinctive material aspects Ubaid cultural phenomenon. In particular, end Middle Chalcolithic period been investigated well-stratified contexts comparable with best-known archaeological record from Mosul-Tepe Gawra region Syrian steppe despi...