Radiation analysis of various vehicle and payload configurations for the reusable nuclear shuttle

Radiation analyses were performed and shielding weight requirements were estimated for various candidate vehicle and payload configurations for use with the reusable nuclear shuttle. The analyses included both point kernel and Monte Carlo approaches. The effects on reduced shield weight were determined for propellant ranks with pointed conical tank bottoms and for one case of a cluster of small tanks. This later case, however, had an arrangement which had no center tank in the upper tier of tanks. This effect negated most of the gain of going to the smaller tanks. A range of shield weights is presented for various light and heavy manned payload configurations when used in conjunction with a single liquid hydrogen propellant tank, 33 ft in diameter with a 15 deg conical tank bottom

Whither Haiti?

Dr. Donald E. Schulz looks at the prospects for political stability, democratization, and socioeconomic development. His conclusions are sobering. While by no means dismissing the possibility that Haiti can make it, he presents a portrait of the imposing obstacles that must still be overcome and a detailed discussion of the things that could go wrong. In a nutshell, he argues that without a much greater willingness on the part of the United States and the international community to stay the course in terms of providing long-term security and socioeconomic aid, Haiti is unlikely to make a successful transition to a stable, democratic, economically modernizing nation. (Even with continuing assistance, the outlook will be problematic.) He argues that unless the United States and other foreign donors recognize this and do what is necessary to give the Haitian experiment a better chance to succeed, the tactical success that has been enjoyed so far will sooner or later be transformed into a strategic failure. His policy recommendations, in particular, deserve close scrutiny.https://press.armywarcollege.edu/monographs/1218/thumbnail.jp