This invention is directed to pharmaceutical compositions comprising corticotropin releasing factor antagonist and growth hormone or growth hormone secretagogues, prodrugs thereof, or pharmaceutically acceptable salts of said compounds or said prodrugs. A substrate is provided and a first layer of dielectric material is grown on the substrate. The conical silencing element is specifically sized to avoid resonant vibration within the operational RPM range of the engine and is further sized relative to the combined displacement of the engine andor cylinder bank in fluid communication therewith to avoid resonant vibrations caused by reflected exhaust gas pressure waves generated by the internal combustion engine. The as-synthesized semiconducting SWNTs can be used directly for fabricating field effect transistor devices without the need for any post-synthesis purification or separation.