The Petrov type of the five-dimensional Myers-Perry metric

We point out that the Myers-Perry metric in five dimensions is algebraically special. It has Petrov type \underline{22}, which is the Petrov type of the five-dimensional Schwarzschild metric.Comment: 4 pages, 1 figur

The Tachyon Potential in Witten's Superstring Field Theory

We study the tachyon potential in the NS sector of Witten's cubic superstring field theory. In this theory, the pure tachyon contribution to the potential has no minimum. We find that this remains the case when higher modes up to level two are included.Comment: Latex, 10 pages, 1 figure, published version, comments added regarding the absence of the twist-invariance and the singular behaviour of the potentia

Level Four Approximation to the Tachyon Potential in Superstring Field Theory

We compute the tachyon potential to level 4 in NS superstring field theory. We obtain 89% of the conjectured vacuum energy.Comment: Latex, 8 pages, 1 figure, published version, references change

Free-form 2.5D thermoplastic circuits using one-time stretchable interconnections

A technology is presented for the production of soft and rigid circuits with an arbitrary 2.5D fixed shape. The base of this technology is our proprietary technology for elastic circuits with a random shape, in which the elastic thermoset (mostly PDMS) polymer is now replaced by soft or rigid thermoplastic variants. An additional thermoforming step is required to transform the circuit from its initial flat to its final fixed 2.5D shape, but for rigid fixed shape circuits only one-time stretchability of the extensible interconnects is required, relieving the reliability requirements

Measurement and evaluation of the applicability of reflective displays for direct view applications

A measurement set-up is presented to analyse the applicability of reflective displays for direct view applications. Essential for this set-up is to simulate the different types of illumination caused by environmental light. As an example the applicability of a reflective PNLC display is evaluated

Design and modelling of thermoformed displays for smart contact lenses

This paper explores the challenges regarding the thermoforming of a deformable guest-host liquid crystal display within a smart contact lens. Focus was given to the finite element modelling of its thermoforming, to find respective design rules. Such displays are thought to be used in vision correction applications (i.e. artificial iris)