Navigation Links
'Invisibility cloak' could protect against earthquakes
Date:7/20/2009

LIVERPOOL, UK 20 July 2009: Research at the University of Liverpool has shown it is possible to develop an 'invisibility cloak' to protect buildings from earthquakes.

The seismic waves produced by earthquakes include body waves which travel through the earth and surface waves which travel across it. The new technology controls the path of surface waves which are the most damaging and responsible for much of the destruction which follows earthquakes.

The technology involves the use of concentric rings of plastic which could be fitted to the Earth's surface to divert surface waves. By controlling the stiffness and elasticity of the rings, waves travelling through the 'cloak' pass smoothly into the material and are compressed into small fluctuations in pressure and density. The path of the surface waves can be made into an arc that directs the waves outside the protective cloak. The technique could be applied to buildings by installing the rings into foundations.

Sebastien Guenneau, from the University's Department of Mathematics, who developed the technology with Stefan Enoch and Mohamed Farhat from the Fresnel Institute (CNRS) in Marseilles, France, explained: "We are able to 'tune' the cloak to the differing frequencies of incoming waves which means we can divert waves of a variety of frequencies. For each small frequency range, there is a pair of rings which does most of the work and these move about a lot bending up and down when they are hit by a wave at their frequency.

"The waves are then directed outside the cloak where they return to their previous size. The cloak does not reflect waves they continue to travel behind it with the same intensity. At this stage, therefore, we can only transfer the risk from one area to another, rather than eliminate it completely."

He added: "This work has enormous potential in offering protection for densely populated areas of the world at risk from earthquakes. The challenge now is to turn our theories into real applications that can save lives small scale experiments are underway."

Seismic waves also include coupled pressure and shear body waves which are less destructive than surface waves. Sebastien Guenneau and Sasha Movchan at the University of Liverpool, together with Michele Brun at Cagliari University, have designed an 'elastic' cloak to protect against these particularseismic waves and the team is currently seeking a suitable material to accommodate the elastic parameters of the cloak.


'/>"/>

Contact: Kate Spark
kate.spark@liv.ac.uk
44-151-794-2247
University of Liverpool
Source:Eurekalert

Related biology news :

1. HIV pays a price for invisibility
2. A viral cloaking device
3. Carnegie Mellon researchers create invisibiity cloak
4. U of A honored for research that could help 30 million Brazilians
5. Clean fuels could reduce deaths from ship smokestacks by 40,000 annually
6. US-Mexico border wall could threaten wildlife species
7. Pacific Northwest forests could store more carbon, help address greenhouse issues
8. New e-science service could accelerate cancer research
9. New MRI technique could mean fewer breast biopsies in high-risk women
10. New biomarker method could increase the number of diagnostic tests for cancer
11. Super-sleepers could help super-sizers!
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/28/2017)... , Spanien, 27. Februar 2017  EyeLock LLC, ... Iris-Scan, wird seine erstklassige biometrische Lösung zur ... 835 mit X16 LTE auf dem Mobile ... März) am Qualcomm-Stand in Halle 3, Stand ... beinhaltet die Sicherheitsplattform Qualcomm Haven™ – eine ...
(Date:2/26/2017)... 25, 2017  Securus Technologies, a leading provider ... public safety, investigation, corrections and monitoring, announces the ... "Too often, too many offenders return ... jails are trying to tackle this ongoing problem ... and family members. While significant steps are underway, Securus ...
(Date:2/22/2017)... Feb. 22, 2017 With the biometrics ... Research identifies four technologies that innovative and agile ... significant share in the changing competitive landscape: multifactor ... authentication.   "Companies can no longer ... security," says Dimitrios Pavlakis , Industry Analyst ...
Breaking Biology News(10 mins):
(Date:3/28/2017)... -- Biostage, Inc. (Nasdaq: BSTG), ("Biostage" or ... to treat cancers and other life-threatening conditions of the ... McGorry, CEO of Biostage, will present on the ... MassBio 2017 Annual Meeting on Thursday, March ... The 3D Printing and BioEngineering panel will ...
(Date:3/28/2017)... , March 28, 2017 /PRNewswire/ -RepliCel Life Sciences Inc. (OTCQB: ... to report compelling safety and clinical data from its phase ... 1 collagen-expressing, hair follicle-derived fibroblasts (RCT-01) as a treatment for ... ... a complete safety profile at 6 months and showed no ...
(Date:3/27/2017)... March 27, 2017 Cousins Properties (NYSE: ... leading biotechnology companies, has signed a 10-year, approximately 125,000 square-foot ... office asset located in the Westshore submarket of ... that Amgen has chosen Corporate Center for their new location ... , president and chief executive officer of Cousins Properties. "Amgen ...
(Date:3/27/2017)... The new research portal will give visitors quick ... Valero Energy , offering extensive market research on their ... ... The latest trend gaining momentum in ... even though touted as a green alternative to fossil fuels, ...
Breaking Biology Technology: