34 research outputs found
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The Wave-Front Correction System for the Sunrise Balloon-Borne Solar Observatory
This paper describes the wave-front correction system developed for the Sunrise balloon telescope, and it provides information about its in-flight performance. For the correction of low-order aberrations, a Correlating Wave-Front Sensor (CWS) was used. It consisted of a six-element Shack - Hartmann wave-front sensor (WFS), a fast tip-tilt mirror for the compensation of image motion, and an active telescope secondary mirror for focus correction. The CWS delivered a stabilized image with a precision of 0.04 arcsec (rms), whenever the coarse pointing was better than ± 45 arcsec peak-to-peak. The automatic focus adjustment maintained a focus stability of 0.01 waves in the focal plane of the CWS. During the 5.5 day flight, good image quality and stability were achieved during 33 hours, containing 45 sequences, which lasted between 10 and 45 min. © 2010 The Author(s)
Proof of global stability, transitional dynamics, and international capital flows in a two-country model of innovation and growth
convergence, international trade, international capital flows, stability, endogenous growth, F12, O41,
“Itô's Lemma” and the Bellman Equation for Poisson Processes: An Applied View
stochastic differential equation, Poisson process, Bellman equation, portfolio optimization, consumption optimization, C61, D81, D90, G11,
Optimal patent length and breadth in an economy with creative destruction and non-diversifiable risk
Patents, Imitation, Innovation, Product cycles, Non-diversifiable risk, L11, L16, O31, O34,