Effects of anomalous propagation conditions on weather radar observations

In this chapter our objective is to provide an overview of the effects of anomalous propagation conditions on weather radar observations, based mostly on studies performed by the authors during the last decade, summarizing results from recent publications, presentations, or unpublished material. We believe this chapter may be useful as an introductory text for graduate students, or researchers and practitioners dealing with this topic. Throughout the text a spherical symmetric atmosphere is assumed and the focus is on the occurrence of ground and sea clutter and subsequent problems for weather radar applications. Other related topics such as long-path, over-the-horizon propagation and detection of radar targets (either clutter or weather systems) at long ranges is not considered here; however readers should be aware of the potential problems these phenomena may have as range aliasing may cause these echoes appear nearer than they are ¿ for more details see the discussion about second trip echoes by Zrnic, this volume.

Reconfigurable Architecture To Estimate The Motion Of An Underwater Vehicle

This work proposes a parallel architecture for a motion estimation algorithm. It is well known that image processing requires a huge amount of computation, mainly at low level processing where the algorithms are dealing with a great numbers of data-pixel. One of the solutions to estimate motions involves detection of the correspondences between two images. Due to its regular processing scheme, parallel implementation of correspondence problem can be an adequate approach to reduce the computation time. This work introduces parallel and real-time implementation of such low-level tasks to be carried out from the moment that the current image is acquired by the camera until the pairs of point-matchings are detected

Observations sur les articles IX & X du titre III du projet de décret du comité ecclésiastique sur la Constitution du clergé ([Reprod.]) / par un député à l'Assemblée nationale

Collection : Les archives de la Révolution française ; 8.167

Observations sur la défense de l'ouvrage de M. Grégoire, intitulé : Légitimité du serment civique" ([Reprod.]) / par un ecclésiastique, membre de l'Assemblée nationale

Collection : Les archives de la Révolution française ; 8.600

Observations sur le projet de supprimer en France un grand nombre d'évêchés ([Reprod.])

Collection : Les archives de la Révolution française ; 8.248