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The Euro50 Extremely Large Telescope

Euro50 is a proposed optical telescope with an equivalent primary mirrordiameter of 50 m. Partners of the collaboration are institutes inSweden, Spain, Ireland, Finland, and the UK. The telescope will have asegmented primary mirror and an aplanatic Gregorian configuration withtwo elliptical mirrors. For a 50 m telescope there would be noeconomical advantage in going to a spherical primary. The siz

Using Jitterbug to Derive Control Loop Timing Requirements

Linking scheduling attributes to control performance specifications is a difficult problem. This paper discusses how the MATLAB toolbox Jitterbug can be used to derive timing requirements for control loops from various control performance specifications. The resulting timing requirements include specifications on sampling periods, latencies, and jitter. An overview of the Jitterbug approach is giv

Democracy without Democratic Values: A Rejoinder to Welzel and Inglehart

In reply to Welzel and Inglehart in this issue, we deploy three lines of criticism. First, we argue that their newly invented construct "effective democracy" is conceptually and empirically flawed. Second, we show that their results are highly sensitive to model specification. Regardless of the time period, their supportive evidence vanishes if a more pertinent measure of democracy is used instead