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We present a simple experiment to measure the magnetic dipole moment of a magnet using two identical magnets and spring dynamometers. The experiment illustrates the concept of a dipole field, as well as the interaction between two magnetic dipoles. The validity of the magnetic dipole approximation is discussed. The experiment also makes it possible to obtain the remanent magnetization of rare earth magnets.

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Exlended x-ray absorption fine structure has been used to determine a crystallographic distodon in the Co layers in Co-Cu single-crystal superlattices grown on Cu(100). The FCC structure of the superlattice imposed by the CU s n b s m e is dislorted along the growing direction for the CO layers, which m compressed perpendicularly to the interfaces. They adopt the in-plane lattice constant of the Cu subsuate, keeping constant the atomic volume of Co (1 1.30 .&'/atom). close to the value for HCP-C~.

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Continuous measurements of particle mass size distributions were carried out in summer 2004 at an urban location in the western Mediterranean using an optical particle counter. In this work we propose a simple methodology to identify PM episodes and determine their influence on mass size distributions. During the study period three types of event produced a significant increase in TSP daily levels: Saharan dust intrusions, firework displays and strong winds, modifying size distributions in different ways. As well, a traffic-related mass size spectrum was obtained showing road dust particles injected into the atmosphere by vehicle-induced resuspension having mainly aerodynamic diameters between 5 and 15 microm. This was confirmed by principal component and conditional probability function analyses.

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