连续波锁模P_r~（3＋）：YLF激光器

本文报导了采用氩离子激光器来泵浦Ｒｒ￣（３＋）：ＹＬＦ晶体，应用声光调制器实现了主动锁模；同时应用振动─高反射平面镜也实现了被动锁模，两种锁模均得到了ｐｓ光脉冲。据作者了解这是这种晶体材料的第一次锁模运转。     

Magnetic soils from mafic lithodomains in Brazil

Tropical soils typically retain high amounts of iron oxides and some of them are magnetic, in the sense that their spontaneous magnetization σ > 1JT^-1 kg^-1. The two major orders forming on mafic domains, namely, dusky red Oxisol and Alfisol, generically referred to as terrae rossae, are the most representative magnetic soils and cover as much as 3.9%(∼330 000 km² of the Brazilian land area. In this paper, an up‐to‐date overview is presented, dealing with selected magnetic soils forming on four representative examples of mafic lithology. Some aspects of their iron oxide mineralogy and field and laboratory methodologies of study are discussed. This revised version was published online in August 2006 with corrections to the Cover Date.