This paper describes the engineering trade-offs ’ performed on a coilgun design a t the Center for Electromechanics at The University of Texas at Austin (CEMUT). The concept used was that of a collapsing field accelerator. This concept was chosen because of its passive operation, and because it lent itself to existing power supplies. The trade-offs described, however, should be performed on any...

This article presents archaeological data on Late Postclassic long-distance trade in central and northern Mesoamerica. A ~ t e c trade goods from the Basin of Mexico (ceramics and obsidian) are widespread, while imports from other areas are much less common, both in the Basin of Mexico and elsewhere. The artifactual data signal a high volume of exchange in the Late Postclassic, and while trade ...

A (v, k, t) trade can be used to construct new designs with various support sizes from a given t-design. H.L. Hwang (1986) showed the existence of (v, k, t) trades of volume 2t and the non-existence of trades of volumes less than 2t or of volume 2t + 1. In thIs paper, first we show that there exist (v, k, t) trades of volumes 2t + 2t1 (t ~ 1), 2t + 2t1 + 2t 2 (t ~ 2), 2t + 2t 1 + 2t 2 + 2t 3 (t...

R e c e n t trade theory literature has devoted considerable attent ion to trade in services. A t issue is whether trade in services can be adequately explained by existing models or whether there are l ikely to be any n e w insights to be gained by considering services as dist inct f rom goods. T h i s paper provides a selective survey of the relevant theoretical literature and considers sever...

Focus " The World Trade Center is a living symbol of man's dedication to world peace.. .. [T]he World Trade Center should. .. become a representation of man's belief in humanity, his need for individual dignity, his beliefs in the cooperation of men, and through cooperation, his ability to find greatness. " Minoru Yamasaki, chief architect of the World Trade Center quoted in Architects on Archi...

Demonstrating compliance with the applicable regulations for the Waste Isolation Pilot Plant (WIPP) requires an assessment of the Iong-term performance of the disposal system. Scenario development is one starting point of this assessment, and generates inqui~ about the present state and fiture evolution of the disposal system. Scenario development consists of four tasks: (i) identi&ing and clas...

Testosterone (T) mediates a trade-off, or negative correlation, between paternal behavior and aggression in several seasonally breeding avian species. However, the presence or absence of a T-mediated trade-off in mammals has received less attention. We examined the relationship between paternal behavior and territorial aggression in the biparental California mouse, Peromyscus californicus. In c...