The challenges and opportunities of supersonic transport propulsion technology

The major challenges confronting the propulsion community for civil supersonic transport applications are identified: high propulsion system efficiency at both supersonic and subsonic cruise conditions, low-cost fuel with adequate thermal stability at high temperatures, low noise cycles and exhaust systems, low emission combustion systems, and low drag installations. Both past progress and future opportunities are discussed in relation to perceived technology shortfalls for an economically successful airplane that satisfies environmental constraints

Book Reviews

Reviews of the following books: A History of Lumbering in Maine: 1861-1960 by David C. Smith; Edward Preble: A Naval Biography: 1761-1807 by Christopher McKee; New England and the Sea by Robert G. Albion, William A. Baker, Benjamin W. Larabee and Marion V. Brewington; Naval and Maritime History: An Annotated Bibliography by Robert G. Albio

Examining Admission Factors in an MPA Program

This article presents an in-depth examination of the validity of the admission factors employed by a NASPAA-accredited MPA program. Admission factors are examined to determine if particular factors, or a set of factors, are most indicative of an applicant’s potential achievement in the MPA program as measured by a student’s final grade point average (GPA) in the program. The study uses truncated regression techniques to analyze student records in order to determine the relative significance of a set of commonly collected admissions information. We find that the best predictor of success in the MPA program, as measured by final GPA in the program, is the applicant’s undergraduate GPA. This finding brings into question the utility of much of the information collected in a typical MPA program application