Cops and Robbers is a vertex-pursuit game played on graphs which has received much recent attention. Graphs where one cop has a winning strategy, so-called cop-win graphs, were discovered in the early 1980’s by Nowakowski and Winkler and independently by Quilliot. Since their introduction, the structure of cop-win graphs has been relatively well-understood. Cop-win graphs possess a vertex elimi...

UNLABELLED The need to develop new dental luting agents in order to improve the success of treatments has greatly motivated research. OBJECTIVE The aim of this study was to evaluate the diametral tensile strength (DTS) and film thickness (FT) of an experimental dental luting agent derived from castor oil (COP) with or without addition of different quantities of filler (calcium carbonate - CaC...

We explored changes in the postural preparation to stepping introduced by modifications of the initial coordinates of the center of pressure (COP). We hypothesized that the postural adjustments in the anterior-posterior direction would persist across all initial COP manipulations while the adjustments in the medio-lateral direction would be highly sensitive to the initial COP coordinate. Health...

Two new pyrene-cored covalent organic polymers (COPs), CK-COP-1 and CK-COP-2, were synthesized via the one-step polymerization of two thiophene-based isomers, 1,3,6,8-tetra(thiophene-2-yl) pyrene (L1 ) and 1,3,6,8-tetra(thiophene-3-yl) pyrene (L2 ). The resulting pyrene-cored COPs exhibit rather different surface areas of 54 m2 g-1 and 615 m2g-1 for CK-COP-1 and CK-COP-2, respectively. The CO2 ...

The role of a facilitator is key to the effective establishment and sustainment of Communities of Practice (COP). This paper presents a taxonomy of facilitation tasks that have to be carried out to support various COP processes that take place during the different stages in a COP’s life-cycle. Inspired by facilitation research in the area of Group Support Systems (GSS), we identified 33 facilit...

We consider a variant of the game of Cops and Robbers, called Lazy Cops and Robbers, where at most one cop can move in any round. We investigate the analogue of the cop number for this game, which we call the lazy cop number. Lazy Cops and Robbers was recently introduced by Offner and Ojakian, who provided asymptotic upper and lower bounds on the lazy cop number of the hypercube. By investigati...

We compared anteroposterior and mediolateral range of motion and velocity of the center of pressure (COP) on the horse's back between riders without disabilities and riders with cerebral palsy. An electronic pressure mat was used to track COP movements beneath the saddle in 4 riders without disabilities and 4 riders with cerebral palsy. Comparisons between rider groups were made using the Mann-...