Abstract: The present application provides a timer, including a base, a driving shaft, and an indicator arm. The driving shaft is rotatably mounted on the base and selectably rotates relative to the base. The indicator arm includes a second support and a plurality of hour blocks. The second support is rotatably connected to the driving shaft. The hour blocks each include a second block body and a second gear. The second block body is rotatably connected to the second support. The second gear is fixedly connected to the second block body. Second protrusion is correspondingly arranged on a rotation path of the second gear around the driving shaft. The second gear has second tooth grooves. The second protrusion selectably extends into the second tooth grooves to drive the second gear to rotate relative to the second support so as to drive the hour blocks to rotate relative to the second support.

Abstract: The present application refers to a process for preparing of nanostructured metal oxides such as cobalt oxide and transition metal incorporated cobalt oxides and nickel aluminium oxides and nickel metal supported on aluminium oxide using plant material such as spent tea leaves as a hard template and the use of such catalysts for water oxidation.