Josy Welter

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1. Lab. Magmas et Volcans, Université Blaise Pascal – UMR 6524, 5 rue Kessler, 63038 ClermontFerrand, France, 2. Dept. of Geophysics/Astrophysics, National Museum of Natural History, Rue Josy Welter 19, 7256 Walferdange, Luxembourg, 3. Dept. of Geology, Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren,(More)
Compact and lightweight, microwave amplifiers are increasingly needed for mobile Mil-Satcom communication requirements as well as compact radar applications. L-3 communications electron devices has developed a high performance low noise TWT for use in a microwave power module (MPM) with CW output powers of 200 watts in the 13-16 GHz communication band.
In describing the development and measured results to date, this paper discusses the design process which led to a nearly fully compliant prototype on the first build. A priori design code predictions were shown along with the measured hardware performance. In the interest of continuous improvement, lessons learned are also be given. These include use of(More)
Efficient lightweight microwave power modules produce high RF output power in a compact package. Microwave power modules (MPM) are the first choice for rugged applications where reliability, efficiency and high power to weight ratio equipment is needed to perform in advanced applications such as high data rate communication and mobile synthetic aperture(More)
This paper presents the ongoing efforts developed in North Kivu (DRC) for the implementation of the understanding, the monitoring, and the management of the risks associated to the activity of the Nyiragongo and Nyamulagira volcanoes. Most of the ongoing activities in the region have been motivated by the eruption in January 2002 of the Nyiragongo that had(More)
1 Instituto de Engenharia de Estruturas, Território e Construção, Instituto Superior Tecnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal, Section of Earth and Environmental Sciences, University of Geneva, 13, rue des Maraîchers, CH-1205 Geneva, Switzerland, Department of Geophysics/Astrophysics,(More)
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