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Doppler peaks extraction from massive raw data is a tricky part of coherent wind Lidar (CDWL) optimization. In this paper, hybrid genetic/Powell algorithm (HGAP) proposed to process the power spectrum measured signal CDWL. The HGAP has excellent global exploration capability, which likes traditional genetic algorithms and fast convergence, like Powell method. Hence, advantages find center frequ...

The Powell–Sabin (PS) piecewise quadratic C finite element on the PS 12-split of a triangulation is a common choice for the construction of a BPX-type preconditioner for the biharmonic equation. In this note we investigate the related Powell–Sabin element on the PS 6-split instead of the PS 12-split for the construction of such preconditioners. For the PS 6-split element multilevel spaces can b...

the death of the english national health service (nhs) may be slow in coming but that does not mean that it is not the conservative-led uk government’s desired end state. the government is displaying tactical cunning in achieving its long-term purpose to remould the british state. powell seeks greater clarity amidst the confusion but the lack of clarity is a principal weapon in the government’s...

A new rank-two variable-metric method is derived using Greenstadt's variational approach [Math. Comp., this issue]. Like the Davidon-Fletcher-Powell (DFP) variable-metric method, the new method preserves the positive-definiteness of the approximating matrix. Together with Greenstadt's method, the new method gives rise to a one-parameter family of variable-metric methods that includes the DFP an...

The calibration of micro inertial measurement units is important in ensuring the precision of navigation systems, which are equipped with microelectromechanical system sensors that suffer from various errors. However, traditional calibration methods cannot meet the demand for fast field calibration. This paper presents a fast field calibration method based on the Powell algorithm. As the key po...