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...rational spine curve and rational radius function. In turn, this characterization inspires an algorithm for computing the symmetries of such canal surfaces. For Dupin cyclides in canonical form, we apply the characterization to derive an intrinsic description of their symmetries and symmetry groups, which...

...materials and, in most cases, they are designed to have long life times. Thus, plastics contain a complex blend of stabilizers that prevent them from degrading too quickly. Unfortunately, many of the most advantageous properties of plastics such as their chemical, physical and biological inertness and durability...

...violations exist. This leads to fewer inactive constraints in the constrained least squares problem associated with the passivity enforcement step, and thereby faster solving. The new approach is combined with the residue perturbation method known as RP-NNLS for maximum performance. The resulting procedure...

...real time information to collaborate across social, professional, organisational and geographical boundaries. The study is based on data from existing practice in planning and scheduling of maintenance work in an oil and gas company operating at the Norwegian continental shelf. The purpose of IPL is to...

...ships is a more realistic value proposition than autonomous cars, but current approval procedures may be too strict and costly. How the concept of autonomy is different for cars and ships, and other factors that favors the autonomous ship as winner given that the industry agrees on reasonable safety requirements...