Spontaneous interaction among humans and things in pervasive computing systems is often based on the spatial outreach to which an entity can interact with another entity, often referred to as ”zone of interaction”. Usually technological sensors for proximity and distance, like radio, ultrasound or microwave, are used to perceive and track the presence, activity and utterance of entities in the ...

THE EDITORIAL BY ROSAMOND NAYLOR, “Offshore aquaculture legislation” (8 Sept., p. 1363), suggests that the motivation for moving aquaculture into the open ocean is that “marine f ish farming near the shore is limited by state regulations.” Although unworkable regulations may exist in a few states, in the larger scheme this is irrelevant. Of the offshore aquaculture projects currently under way,...

Abstract. The growing competition for finite land and water resources the need to feed an ever-growing population require new techniques monitor performance of irrigation schemes improve productivity. Datasets from FAO's portal Water Productivity through Open access Remotely sensed derived data (WaPOR) are increasingly applied as a cost-effective means support assessment identify possible pathw...

Extreme weather phenomena linked to climate change are affecting the productivity of crops which main food sources nationwide, such as potatoes, wheat, barley, beans and corn. In addition, absence comprehensive agricultural extension technical assistance programs limits development sector. this context, research offers proposals for decision-making in two natural regions Peru (the coast highlan...