(From LIU Yaoguang of Key Laboratory of Noise and Vibration Research) Professor Kirill V. Horoshenkov, invited by Dr. WANG Xiaolin from Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, gave a seminar on the topic of "Acoustic Properties of Siols and Plants, and Materials with Pore Stratification" in IACAS on September 8,2011. The seminar was chaired by Dr. WANG Xiaolin. 　　 

Professor Horoshenkov began the seminar by introducing the basic physical model of sound wave propagation in rigid porous material. He then reviewed the existing empirical and theoretical models for the acoustic properties of rigid porous material, and presented formulas for calculating parameters such as the characteristic impedance of porous material and complex wavenumber (propagation constant). He also gave the methods for measuring related macroscopic parameters of porous media. At the end of the seminar, Professor Horoshenkov gave an interesting example on the effect of soil and plants on sound absorption. He pointed out that not all plants are capable of providing good sound absorption. He presented sound absorption principal based on the vibration of plant leaves as well as their scattering effects. The attendees held an active discussion with Prof. Horoshenkov after the meeting on issues of interest.　 　　　　　 

Professor Horoshenkov is an expert in outdoor sound propagation, acoustic materials and instrumentation. He has been actively involved in the professional life of the acoustic community in both UK and overseas. He serves as a member of the Engineering Division Committee of the Institute of Acoustics (IOA) and Engineering and Physical Sciences Research Council (EPSRC) Peer Review College. He is also the associate editor of the Journal of the Acoustical Society of America, Journal of Applied Acoustics and the Journal of Acta Acustica (United with Acustica). He authored and coauthored two books published over 100 journal and conference papers, and has successfully submitted four patent applications.