The invention provides a set of mechanisms by which a wireless mobile mesh node equipped with a directional antenna may self form and self adapt its steady-state communications schedule. A transmission scheme setting unit sets, based on the evaluation value, adaptive array transmission that achieves both null steering and beamforming or beamforming dedicated transmission as a transmission scheme to the communication partner device. A three dimensional window geometry to be applied to the transformed data is selected, based, at least in part, on expected feature sizes present, data sampling density and a size of the subsurface region. A ventilation system is provided for distributing air from the first passage along the support surface of the seat cushion. Anchor points are identified to locally deform the interior map, preserving internal structures, to better align with the venue exterior. The main streams andor part-streams of the starting materials come into contact with one another according to the countercurrent principle.