A variable ratio sprocket assembly for providing improved transition between gears and eliminating derailing. A method according to one embodiment includes creating a mixture comprising particles, at least one dopant, and at least one solvent; adding the mixture to a mold; forming a green structure in the mold; and sintering the green structure to form a transparent ceramic. The method may include generating a virtual desktop including a plurality of objects organized in accordance with at least one of a theme and a structure; providing a navigation pane on the virtual desktop to navigate through the plurality of objects; and providing a controller to enable a multi-level zoom on at least one of the plurality of objects on the virtual desktop. The pathways to all these compounds begin with a common pathway of condensing a piperidone with a primary amine so as to form a 4-amino carboxyamino-piperidine, wherein N of said piperidone is a \u2014N\u2014COO\u2014nCH3, alkylating an N of said primary amine which was condensed with said piperidone thereby producing an N-alkyl-anilide, and hydrolyzing said \u2014COO\u2014nCH3.