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Acoustic environment may explain why some bird songs outlast others

A new study suggests that environmental factors can influence which bird songs are passed down through generations. Common song types, with higher frequencies and broader frequency bandwidths, traveled more effectively through the environment than rare songs. This makes it easier for young birds to hear and learn these songs, potential...

SourceFlorida Atlantic University·JournalBioacoustics·TypeObservational study·DateJun 10, 2026

Multi-bubble math

Scientists at the University of Tsukuba have developed a theoretical model to describe the motion of ultrasound waves in liquids containing multiple bubbles, which may enable advances in diagnostic and therapeutic applications of ultrasound technology. The new equations can also be used to enhance microbubble-enhanced medical applicati...

SourceUniversity of Tsukuba·JournalUltrasonics Sonochemistry·DateJul 11, 2022

Navigating the shallows

A team of researchers from the University of Tsukuba has developed a new approach for accurate underwater acoustic positioning in multipath environments. By using a database of signals and selectively removing reflected waves, they achieve centimeter-scale accuracy in object location, even in shallow waters.

SourceUniversity of Tsukuba·JournalJapanese Journal of Applied Physics·DateMay 26, 2022