In this paper a new approach to the problem of recognizing the preceding vehicle on highways is presented. The system is based on monocular vision. Since on highways the position of the preceding vehicle in the image varies slowly, its previous and current positions are compared using correlation. Such image processing produces a very clear output, which, at a higher level, allows a simple and ...

Intercontinental transport (ICT) of trace substances normally occurs on timescales ranging from a few days to several weeks. In this paper an extraordinary episode in November 2001 is presented, where pollution transport across the North Atlantic took only about one day. The transport mechanism, termed here an intercontinental pollution express highway because of the high wind speeds, was excep...

Recently, there has been immense interest in using unmanned aerial vehicles (UAVs) for civilian operations. As a result, unmanned aerial systems traffic management is needed to ensure the safety and goal satisfaction of potentially thousands of UAVs flying simultaneously. Currently, the analysis of large multi-agent systems cannot tractably provide these guarantees if the agents’ set of maneuve...

IN TR O D U C TIO N Until recently aggregates were considered inert materials which, when mixed with some cementing agent, served as filler in concrete. This concept is far from reality. Research and experience have demonstrated that aggregates are physically and chemically active in ways that control their serviceability in concrete. Since these materials constitute about 75 per cent of the vo...

the agromyzid leafminers, liriomyza sativae blanchard and l. trifolii (burgess) (dip-tera: agromyzidae) are major pests that attack vegetables in varamin, tehran province. the parasitoids (hymenoptera: eulophidae) of these pests were investigated during 2003. the leafminer infested leaves were collected from different host plants, in particular cu-cumber (cucumis sativus l.,) and preserved unde...