93,657 research outputs found
Closed-loop control of stochastic nonlinear systems
Technique resolves problems in complex control systems, such as those used for space vehicle guidance and control. Main disadvantage of procedure is that it is only appropriate in situations where trajectory concept is valid
Thermodynamics of (2+1)-flavor QCD
We report on the status of our QCD thermodynamics project. It is performed on
the QCDOC machine at Brookhaven National Laboratory and the APEnext machine at
Bielefeld University. Using a 2+1 flavor formulation of QCD at almost realistic
quark masses we calculated several thermodynamical quantities. In this
proceeding we show the susceptibilites of the chiral condensate and the
Polyakov loop, the static quark potential and the spatial string tension.Comment: To appear in the proceedings of International Conference on Strong
and Electroweak Matter (SEWM 2006), Upton, New York, 10-13 May 200
Anaerobic reduction of elemental sulfur by Chromatium vinosum and Beggiatoa alba
The effect of sulfur globules on the buoyant density of Chromatium vinosum and Beggiatoa alba was examined. The potential use of sulfur as a terminal electron acceptor in the anaerobic metabolism of Beggiatoa alba is also examined. The effect of the reduction of intracellular sulfur was investigated during dark metabolism on the buoyant density of C. vinosum. It is hypothesized from the results that the sulfur reduction to sulfide is part of an anaerobic energy operating system. Carbon stored as PHB can be oxidized with the concomitant reduction of sulfur to sulfide
Guide to Spectral Proper Orthogonal Decomposition
This paper discusses the spectral proper orthogonal decomposition and its use in identifying modes, or structures, in flow data. A specific algorithm based on estimating the cross-spectral density tensor with Welch’s method is presented, and guidance is provided on selecting data sampling parameters and understanding tradeoffs among them in terms of bias, variability, aliasing, and leakage. Practical implementation issues, including dealing with large datasets, are discussed and illustrated with examples involving experimental and computational turbulent flow data
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