1. Abstract We propose a method to interactively modify contacts between surfaces in a 3D boundaryrepresentation geological model. The modification is based on a hierarchy between a slip surface (a surface that other surfaces can slide along, which in geology could include faults, erosion surfaces, salt tops) and a secondary, deformable surface (e.g. horizon, older fault). The border of the def...

One of the primary flaws with current digital signature technology is that a digital signature does not “feel” or resemble a traditional seal or personal signature to the human observer; lacking a sense of visualisation and changing each time it is applied. This paper reviews the historical value of seals in Eastern and Western cultures to provide a basis to enhance global acceptability of exis...

Most African countries have been using radiation emitting devices and radioactive sources for the past three decades or more for the promotion, development, and utilization of the peaceful application of nuclear techniques fo r the benefit of their countries. Most of these sealed radiation sources have deteriorated to such a state that they are leaking and their current storage situation does n...

There is a voluminous theoretical literature on sealed high-bid auctions (auctions in which bids are sealed and the high bidder pays his bid). See for example, Vickrey (1961), Myerson (1981), Riley and Samuelson (1981), Milgrom and Weber (1982), Matthews (1983), Maskin and Riley (1984), Holt (1980), Cox, Smith and Walker (1988). A critical property on which this literature relies is the existen...