Powerful active remote sensing programs for instance radars that emit their unique electromagnetic radiation could be intrusive and have an affect on the phenomenon currently being investigated.  Data gathered by remote sensing is analyzed on the laboratory which minimizes the work that need

A double layer roll forming machine has two layers or two amounts of roll forming elements which give it A further name twin level roll forming machine, and since this machine can make two steel sheets and double sheet roll forming machine, Double Deck Roll Forming Machine, two i