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The Lateral Vibrations Of An Axially Rotating Bar, William C. Mccorkle Jr
The Lateral Vibrations Of An Axially Rotating Bar, William C. Mccorkle Jr
Doctoral Dissertations
Introduction: It has long been known that the rotational motion of a bar or shaft at certain speeds is capbable of exciting lateral vibrations of the shaft. Almost invariably these vibrations are undesirable or even destructive, and for this reason considerable attention has been given to their study. The subject has a fairly extensive literature dating back to 1869 when Rankine1,2 first treated the stability of a shaft, running true and in perfect balance, against small disturbances. His results were erroneous because he assumed that the plane of vibration always rotated with the shaft, which is equivalent to neglecting …
A Study Of The Catalytic Hydrogenation Of Methoxybenzenes Over Platinum And Rhodium Catalysts, Robert Gene Thompson
A Study Of The Catalytic Hydrogenation Of Methoxybenzenes Over Platinum And Rhodium Catalysts, Robert Gene Thompson
Doctoral Dissertations
[From the Summary]
The catalytic hydrogenation of methoxybenzenes and other aromatic methoxyl compounds has been studied. Hydrogenation of the aromatic ring was usually accompanied by some cleavage of the methoxyl groups. This cleavage occurred predominately upon the carbon-oxygen bond adjacent to the aromatic ring. The cleavage reaction was found to occur only as a part of the aromatic hydrogenation process. The amount of cleavage was found to be dependent upon the catalyst used. Platinum led to extensive methoxyl cleavage while rhodium catalyzed ring saturation with little cleavage. Also found to influence the extent of cleavage were reaction temperature …