Erupting volcanoes are among the most destructive forces in Mother Natures arsenal. But where many people live on or near the flanks of such mountains, the real disaster often doesnt start until the eruption has subsided and the world has stopped paying attention. It is then that rain-swollen rivers emanating from volcanic peaks can send massive lahars – large waves of mud made up of water, ash and volcanic rock – careening down the mountainsides, often burying everything in their paths, even entire towns and villages. Such lahars can occur for years after an eruption, depending on how much debris the volcano deposits and how much rain falls, until the sediment has either been cleaned off the mountain or has stabilized so that it doesnt erode easily.
Mount Pinatubo, northwest of Manila on the Philippine island of Luzon, erupted with devastating force in June 1991 and now is proving to be an ideal laboratory for studying the "hydrologic aftermath" of a volcanic eruption, said Karen Gran, a University of Washington doctoral student in Earth and space sciences.
Gran has been studying data compiled from 1997 through 2003 from five rivers on Pinatubos flanks. The streams are in various stages of recovery, with one almost back to its pre-eruption state because it didnt become as clogged by sediment. But others traverse areas that still have vast amounts of sediment that can be washed away easily. Pinatubos location, in the tropics not far north of the equator, makes it subject to torrential rains from monsoons and typhoons.
Vince Stricherz | EurekAlert!
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In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
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Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
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The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
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An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
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