Last month, I described the invention of transistor technology and some of the early techniques used which were not well suited to mass production or high performance. This article continues where that one left off, covering the rapid progress in the 20 or so years between the first commercial transistor production and the development of manufacturing techniques that are still in use today. by Ian Batty
Since 1955, the Sakurajima volcano has experienced repeated Vulcanian eruptions accompanied by intense air-shocks, large ash clouds, and deflation ground deformations. However, ground deflations sometimes occurred even if no eruption took place. In this study, we categorize deflation events contained in continuous deformation records covering eruptive activities at the Sakurajima volcano Minamidake crater during the period from November 2017 to December 2020. The deflation events are classified into eruptive deflation and non-eruptive deflation (NED) types by examining the seismic data, infrasound generations, and visual phenomena. Their event type occurrence characteristics are then further clarified based on their relationships to pressure source volume changes. Comparing the pressure source volume changes with the monthly mass of volcanic ash expelled from the crater, which is estimated from deposition data around the volcano, we found the contribution of NED events to volcanic ash
LankaWeb – Climate change and food security in Sri Lanka: towards food sovereignty lankaweb.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from lankaweb.com Daily Mail and Mail on Sunday newspapers.