An interactive museum exhibit of a digitally augmented medieval musical instrument, the tromba marina, is presented. The tromba marina is a curious single stringed instrument with a rattling bridge, from which a trumpet-like timbre is produced. The physical instrument was constructed as a replica of one found in Musikmuseet, a musical instrument museum in Copenhagen, Denmark. The replica instru...

In this paper, we study a CPT-even Lorentz-breaking extension of the scalar QED. For theory, calculate one-loop lower-order contributions in Lorentz-violating parameters to two-point functions and gauge fields. We found that two background tensors, coming from sectors (scalar gauge) are mixed corrections both finite divergent parts. This shows these terms cannot be studied an isolated form. Bes...

We introduce and provide the first example of a transitive digital signature scheme. Informally, this is a way to digitally sign vertices and edges of a dynamically growing, transitively closed, graph G so as to guarantee the following properties: – Given the signatures of edges (u, v) and (v, w), anyone can easily derive the digital signature of the edge (u,w). – It is computationaly hard for ...

Digitally programmable delay elements (DPDE) arerequired to be monotonic and low power. A lowpower digitally programmable delay element (DPDE) withmonotonic delay characteristics is proposed and a dynamiccurrent mirror together with a feedback technique enables acurrent-on-demand operation. The dynamic power is made proportional to the delay with a maximum of 25μW and static power is eliminated...