January 09, 2020 Thursday 03:06:38 PM IST
Fibre Optic Cables as Seismic Network
Placing seismometers under the sea is prohibitively expensive but an international team of scientists led by California Institute of Technology (CALTECH) has used fiber optic communications cables installed at the bottom of the North Sea to create a giant seismic network, tracking both earthquakes and ocean waves. The fact that the fiber network was able to detect and record a magnitude-8.2 earthquake near Fiji in August 2018 proves the ability of the technology to fill in some of the massive blind spots in the global seismic network, says Caltech graduate student Ethan Williams. Williams is the lead author of a study on the project that was published by Nature Communications on Dec. 18. "Fiber optic communications cables are growing more and more common on the sea floor. Rather than place a whole new device, we can tap into some of this fiber and start observing seismicity immediately," Williams says. The project relies on a technology called distributing acoustic sensing, or DAS. DAS was developed for energy exploration but has been repurposed for seismology. DAS sensors shoot a beam of light down a fiber optic cable.
The smallest fish in the world till date is the Paedocypris which measures only 7 millimeters in length. This is nothing compared to the 9 meters of the whale shark. The small fish have many of the same genes and the same anatomy with the shark, but the dorsal and caudal fins, gills, stomach and heart, are thousands of times smaller! How do organs and tissues of this small fish stop growing very quickly? A multidisciplinary team led by scientists from the University of G...
From rigid substrates, semi conductors are moving towards new, flexible substrates which have led to the fabrication of numerous devices. The Georgia tech researchers have created a material that acts like a second skin layer and is up to 200% more stretchable than its original dimension without significantly losing its electric current. The researchers say the soft flexible photo detectors could enhance the utility of medical wearable sensors and implantable devices, among o...