In this paper a 2-arc of size 21 in the projective Hjelmslev plane PHG(2,Z25) and a 2-arc of size 22 in PHG(2,F5[X]/(X)) are given. Both arcs are bigger than the 2-arcs previously known in the respective plane. Furthermore, we will give some information on the geometrical structure of the arcs.

this paper is to develop a knowledge management (km) model in some iranian academic research centers (arc) based on km critical success factors. general km critical success factors (csf) were identified through literature review. then the research procedure led to the identification of km critical success factors in iranian arcs including 16 different factors. it was done through first stage su...