Noise reduction remains an important priority in the modern society, particular, for urban areas and highly populated cities. Insulation of buildings transport systems such as cars, trains airplanes has accelerated need to develop advanced materials. Various porous materials, commercially available foams granular fibrous are commonly used sound mitigating applications. In this review we examine...

The unique nature of the molecular structures of gas hydrates results in curious acoustic properties which have yet to be adequately characterized. Understanding the acoustic behavior of hydrates in liquids, in bubbly liquids, and in sediments containing liquids and/or gas is vital for surveying their location using seismic or echosounding techniques and may become a key tool for monitoring hyd...