Abstract: There is provided a method and apparatus for processing a diamond surface. The method comprises: i. locating a diamond material having a first surface and a second, opposite surface, in a holder, the holder located at the end of a positioning arm; ii. processing the first surface on a rotating wheel; iii. while the diamond material is in the holder, measuring an angle of the first surface relative to the second surface; iv. repeating steps (ii) and (iii) until a desired angle is achieved.

Abstract: A catalyst structure for treating exhaust gas from a lean burn internal combustion engine comprises a substrate monolith comprising a lean NOX catalyst (LNC) composition associated with at least one partial oxidation catalyst (POC), wherein the LNC composition is selected from the group consisting of: (a) silver or a silver compound supported on alumina; and (b) at least one metal selected from the group consisting of copper (Cu), iron (Fe), cobalt (Co) and cerium (Ce) supported on at least one zeolite, and wherein the at least one POC is selected from the group consisting of: (i) a bulk oxide, a bulk composite oxide or a bulk mixed oxide comprising at least one metal selected from the group consisting of manganese (Mn), iron (Fe), cerium (Ce) and praseodymium (Pr); and (ii) at least one of rhodium (Rh) and palladium (Pd) disposed on at least one inorganic oxide support.