This paper presents a three-dimensional extension of graphic statics using polyhedral form and force diagrams for the design of compression-only and tension-only spatial structures with externally applied loads. It explains the concept of 3D structural reciprocity based on Rankine’s original proposition for the equilibrium of spatial frames. It provides a definition for polyhedral reciprocal fo...

Three genera, Engraulis, Sardinops, and Merlucciu have coincident spawning and juvenile brood areas in most eastern and western boundary currents throughout the world. The CalCOFI survey program has amassed a 50-year data series on location and timing of spawning and the resultant recruitment of anchovy, sardine, and hake in the California Current region. Use of existing Lefkovitch matrix popul...

Associated to every knot or link in R (or in S) we can associate a group, called the fundamental group of the complement of the link, or more simply, the fundamental group of the link. A simple-minded way to approach this is to extend the idea of labeling a link diagram by group elements. Given a group G and an oriented link diagram D, we say that D can be labeled with G if we can label every a...