Seminar 32, Tuesday 09 March 2021, 14:00 (London Time)

Speaker: Gengkai Hu (School of Aerospace Engineering, Beijing Institute of Technology, Beijing, China)

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TitleElastic Metamaterials and Their Applications to Wave Control

Abstract: Wave property of materials is intimately related to their microstructures. By carefully designing the microstructure, different wave functions not available for traditional materials can be envisaged. In this talk, I will demonstrated through three examples the elastic wave control by the design of elastic metamaterials. The first is elastic negative refraction by designing an elastic metamaterial with both negative effective mass and modulus. The second example focuses on elastic wave filtering, we show that solids with only single polarization mode (either transverse wave or longitudinal wave) can be designed with pentamode materials. Finally I will explain the principle to make an asymmetric metamaterials which breaks the property of symmetric stress, and apply it to design elastic wave cloak. These results demonstrate a great capacity of elastic wave tailoring by elastic metamaterials and will surely find engineering applications in the near future.

Biography: Gengkai Hu is currently the Chair Professor of solid mechanics at Beijing Institute of Technology (BIT).  He received his Ph.D. in mechanics and materials from Ecole Centrale de Paris (France) in 1991 and spent two years at the same university as a postdoctoral research associate before joining BIT.  He has written or coauthored more than 170 papers in refereed journals, and received the Award of National Outstanding Youth Scientist by National Natural Science Foundation of China in 2003, and National Outstanding Teacher Award in 2004. He and his research group led some of the early works on elastic metamaterials. His current research interests include: dynamic homogenization of composite materials, metamaterials for controlling elastic wave propagation

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Seminar 33, Tuesday 16 March 2021, 14:00 (London Time)

Speaker: Juliette Pierre (Institut Jean Le Rond D’Alembert, Paris, France)

Title: Surprising acoustic propagation in foams : from liquid to solid

Abstract: Liquid and solid foams present surprising acoustic properties.
A liquid foam is a complex gas-liquid system with a low liquid fraction (<30%). Its rigidity is due to a liquid skeleton, containing the most important part of the liquid and linked by thin liquid films. The bubble size distribution is strongly polydisperse.
Over the past years we investigated, in a large frequency range, how a liquid foam behaves when insonified. We showed that liquid foams act as natural and 3D isotropic acoustic metamaterials. Moreover, this work confirmed that liquid foams have important soundproofing properties. First, I will show you how an acoustic wave propagates and dissipates when it travels through a collection of thin liquid films loaded by the surrounding air and a massive liquid skeleton.
More recently, we investigated the case of solid foams elaborated by solidification of liquids foams and where the entire liquid skeleton (even films) has been preserved. In this second part, I will show you that the presence of very thin membranes is far from being a handicap to blocking sound.

Biography: Juliette Pierre has received her PhD in physical acoustics in 2011 from Sorbonne University at Paris ans is currently a research scientist at CNRS – d’Alembert Institute of Sorbonne University. She is interested in experiment in acoustic wave propagation and liquid-gas systems (bubbles, films and foams).

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Seminar 34, Tuesday 23 March 2021, 14:00 (London Time)

Speakers: Agnes Maurel (Langevin Institute, ESPCI Paris, CNRS) & Kim Pham (IMSIA, ENSTA Paris, Institut Polytechnique de Paris, France)

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Seminar 35, Tuesday 30 March 2021, 14:00 (London Time)

Speakers: Natalia Movchan (Department of Mathematical Sciences University of Liverpool, UK)

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Seminar 36, Tuesday 06 April 2021, 14:00 (London Time)

Speaker: Mahmoud I. Hussein (Ann and H.J. Smead Department of Aerospace Engineering Sciences, University of Colorado Boulder, USA)

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Seminar 37, Wednesday 14 April 2021, 14:00 (London Time)

Speaker: Alexandra Boltasseva (Purdue University, USA)

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Seminar 38, Tuesday 20 April 2021, 14:00 (London Time)

Speaker: Paloma Arroyo Huidobro (Instituto de Telecomunicações, Insituto Superior Técnico-University of Lisbon)

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Seminar 39, Tuesday 27 April 2021, 14:00 (London Time)

Speaker: Maria Kafesaki (Department of Materials Science and Technology, Crete, Greece)

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Seminar 40, Tuesday 04 May 2021, 14:00 (London Time)

Speaker: Ping Sheng (Hong Kong University of Science and Technology)

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Seminar 41, Tuesday 11 May 2021, 14:00 (London Time)

Speaker: Ying Wu (King Abdullah University of Science and Technology, Saudi Arabia)

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Seminar 42, Tuesday 18 May 2021, 14:00 (London Time)

Speaker: Pavel Belov (Research Center of Nanophotonics and Metamaterials, Physics and Engineering Department, ITMO University, St. Petersburg, Russia)

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Biography: Pavel Aleksandrovich Belov (born 18 December 1977 in Ust-Ilimsk, Russia) is a Russian physicist, head of The International Research Centre for Nanophotonics and Metamaterials (St. Petersburg, Russia).

Education: After finishing Saint Petersburg Lyceum 30, Pavel Belov graduated with honors from the ITMO University in 2000. He defended his PhD thesis twice: from ITMO University in Russia in 2003 with the thesis “Analytical modeling of electromagnetic crystals”, and then in Finland in 2006 at the Helsinki University of Technology with the thesis “Analytical modeling of metamaterials and new principle of sub-wavelength imaging”.[1] In November 2010 he received doctor of science degree for his thesis “Analytical modeling of electromagnetic crystals and left-handed materials”. 

Career: Dr. Belov has extensive experience of working abroad (Finland, South Korea, United Kingdom) with such industrial giants as NokiaSamsung Electronics and Bosch. He is a member of the Council of young scientists and specialists of the ITMO University. He is also a member of IEEEAP-SED-SMTT-S, LEO-S (Laser and Electro-Optics Society, www.i-leos.org); URSISPIE scientific societies. Since October 2015, Dr Belov has been on the Board of Scientific Advisors at Metamaterial Technologies Inc., an international optical nano-composites company (www.metamaterial.com) 

Awards: Dr. Pavel Belov is a laureate of the Russian Federation President’s Prize in Science and Innovation for Young Scientists in 2009 (Presidential Decree No.139 of 4.02.2010). The prize is awarded for outstanding contributions to the physics of metamaterials and the development of devices for transmission and processing of superresolution images. He is the winner of grants for State Support of Young Russian Ph.D Scientists in 2005 and 2009. His other prizes include: 

Publications: Pavel Belov is the author of more than 300 scientific articles in refereed journals, 90 conference proceedings and 13 book chapters. His h-index is 53 (according WoS). His work has generated over 11 000 citations. 

SPIE Educational Scholarships (USA, 1999, 2000, 2003)Two SPIE Visiting Lecturer Grants (USA, both 2009)

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Seminar 43, Tuesday 25 May 2021, 14:00 (London Time)

Speaker: Nicholas X. Fang (Department of Mechanical Engineering, MIT, Cambridge, USA)

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Seminar 44, Tuesday 01 June 2021, 14:00 (London Time)

Speaker: Philippe Roux (Director of ISTerre, Grenoble, France)

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Seminar 45, Tuesday 08 June 2021, 14:00 (London Time)

Speaker: John H Page (Ultrasonics Research Laboratory, Department of Physics and Astronomy, University of Manitoba, Canada)

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Seminar 46, Tuesday 15 June 2021, 14:00 (London Time)

Speaker: Katia Bertoldi (Harvard John A. Paulson School of Engineering & Applied Sciences, Harvard University, USA)

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Seminar 47, Tuesday 22 June 2021, 14:00 (London Time)

Speaker: Elena Cherkaev (Department of Mathematics, University of Utah, USA)

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Seminar 48, Tuesday 29 June 2021, 14:00 (London Time)

Speaker: Alastair P Hibbins‬ & Tim Starkey (Physics and Astronomy, University of Exeter, UK)

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Seminar 49, Tuesday 06 July 2021, 14:00 (London Time)

Speaker: Ornella Mattei (Department of Mathematics, San Francisco State University, USA)

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Seminar 50, Tuesday 13 July 2021, 14:00 (London Time)

Speaker: Fernando Guevara Vasquez (Department of Mathematics, University of Utah, USA)

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Seminar 51, Tuesday 20 July 2021, 14:00 (London Time)

Speaker: William J. Parnell (Department of Mathematics, University of Manchester, UK)

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Seminar 52, Tuesday 27 July 2021, 17:00 (London Time)

Speaker: Tadashi Tokieda (Department of Mathematics, Stanford University, California, USA)

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