Abstract: A mobile platform structure, installation and method for use in arctic waters where the dominant environmental loading threats are posed by winter ice pressures and summer ice floes. The structure includes an ice load bearing, submergible substructure and a platform superstructure of approximately equal lateral dimensions. The substructure has a height approximately equal its depth of submergence when ballasted down onto the sea floor and includes a plurality of peripherally arranged, surface accessible spud guides. The spuds are laterally restrained by the spud guides in the top and bottom walls for transmission of lateral loads therebetween at respective vertically spaced apart fulcrum points and are vertically movable in the spud guides for penetration into high shear soils which may be overlaid by relatively low shear soils whereby the shear capacities of both soils combine with the frictional capacity of the structure/sea floor interface to provide high displacement resistance to lateral ice loads.

Abstract: Compounds are prepared which correspond to the formula ##STR1## wherein R represents C.sub.1 -C.sub.12 alkyl, C.sub.1 -C.sub.12 alkoxyalkyl, --CH.sub.2 Ar, Ar';Ar represents ##STR2## each X independently represents halo, C.sub.1 -C.sub.6 alkyl, --OCH.sub.3, --CF.sub.3, --OCF.sub.3, --NO.sub.2, --CN or --CO.sub.2 R.sup.2 ;each n independently represents 0, 1 or 2;Ar' represents ##STR3## R.sup.1 represents C.sub.1 -C.sub.8 alkyl, C.sub.2 -C.sub.6 alkenyl, C.sub.2 -C.sub.6 alkynyl, C.sub.2 -C.sub.6 alkoxyalkyl, CF.sub.3 or Ar";Ar" represents Ar, ##STR4## R.sup.2 represents C.sub.1 -C.sub.6 alkyl. These compounds have been found to be effective pre- and post-emergent herbicides and as active agents in herbicidal compositions.