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LivMS Event: * *Date:* 18 Apr, 2018 * *Time:* 17:30 * *Presenter:* Professor Alexander Movchan (LivMS President) * *Title:* Wave Cloaking and the Millennium Bridge Problem (the "Wibbly Wobbly Bridge") * *Audience:* 16+ * *Venue:* Lecture Theatre 2, Redmonds Building, Liverpool John Moores University, Brownlow Hill Liverpool L3 5UG * *Contact:* Peter Giblin This lecture is FREE for all students and full members of the LivMS. Others pay a door charge of £4 *NO* *TICKETS* *REQUIRED* Car Parking: There is a multi-storey car park very-close-by the Redmonds Building. See web-link: https://liverpool.gov.uk/parking-travel-and-roads/council-car-parks/mount-pleasant/ The traffic-entrance to this car-park is near the bottom of Mount Pleasant. The car park closes at 8pm ---- This lecture is about mathematics of waves. Waves in structured solids may have interesting and unusual properties. A bridge, for example, can be viewed as a waveguide, and waves can be controlled, so that vibrations are suppressed. Waves can also be routed around objects by special coatings, ``invisibility cloaks’’. The lecture explains the theory standing behind these interesting phenomena and includes practical examples. Cloaking is explained via a coordinate transformation applied to the wave equation. Implementations of cloaks are also shown. IMG:cloak2.jpg https://www.liverpool.ac.uk/mathematical-sciences/staff/alexander-movchan/ http://www.independent.co.uk/news/science/revealed-why-the-wobbly-bridge-wobbled-1192835.html/