Copyright 1994 by Loyola College in Maryland. The U.S. government retains a nonexclusive and nontransferable license to exercise all exclusive rights provided by copyright. The ISBN number for this report is 1-883712-31-9. It is distributed by the National Technical Information Service (NTIS) of the U.S. Department of Commerce as NTIS Report # PB94-155702. Information on JTEC/WTEC reports and on ordering them from NTIS is on the inside back cover. Note: This document contains JTEC and WTEC report summaries that have been edited by the JTEC/WTEC and NSF staffs based on the original reports prepared by the JTEC and WTEC panels.