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Air Pollution Control Training In Colleges And Universities In The United States, Harold M. Cota
Air Pollution Control Training In Colleges And Universities In The United States, Harold M. Cota
Civil and Environmental Engineering
A nationwide survey of air pollution control training efforts in the United States at colleges and universities was carried out for the S-ll Education and Training Committee, Air Pollution Control Association. Information from 91 schools having four year or graduate programs and five community colleges was received. Questions include type of course work, backgrounds of participating faculty and students, and eventual placement. At the present time about 70% of those in training are graduate students. It was found that most students taking initial employment in air pollution control activities had the M.S. degree. Recommendations for updating this information are made.
On The Phenomenon Of Vortex Street Breakdown, William W. Durgin, Sture K.F. Karlsson
On The Phenomenon Of Vortex Street Breakdown, William W. Durgin, Sture K.F. Karlsson
Office of the Provost Scholarship
A von Kármán vortex street generated in the usual way was subjected to a deceleration, thereby changing the ratio of longitudinal to lateral spacing between the vortices. Distortion of the individual vortices followed which resulted in annihilation of concentrated vortex regions and creation of a stationary wake flow. This wake flow was itself dynamically unstable and developed into a new vortex street of a different frequency from the initial one. The breakdown of the initial vortex street is qualitatively explained by considering the convection of a concentrated vortex region due to the motion imposed by all the other vortices.