Ultrasonic Propagation

Ultrasonic propagation through hydrating cements

Hydraulic cements develop mechanical strength and low permeability as a result of hydration, which involves chemical reactions between water and the anhydrous compounds present in the cement. Solid hydration products form both at the surfaces of the cement particles and in the pore space by nucleation and aggregation. As a result, the solid phase becomes highly connected and the material transf...

Nonlinear Ultrasonic Wave Propagation in Biological Materials

The n o n l i n e a r i t y p a r a m e t e r B / A h a s b e e n d e t e r m i n e d f o r t i s s u e mode l s ( a q u e o u s s o l u t i o n s o f b i o l o g i c a l m a c r o m o l e c u l e s ) a n d f o r e x c i s e d t i s s u e s f r o m measuremen t s o f t h e f u n d a m e n t a l p r e s s u r e a m p l i t u d e , a t t h e s o u r c e , and t h e s e c o n d ha rmon ic p r e s ...

Ultrasonic propagation properties of mammalian testes.

Unfortunately, only a limited amount of information exists regarding this sensory capability in other marine mammals. Evans, n in a review of the literature, reports comparative discrimination performance, in an echolocation task, for the Bottlenose porpoise (T•rsiops trueearns) and for the Amazon-River dolphin (lnia geoffrenisis) using submerged targets of varying reflective signal strengths. ...

Intra-body Communication Using Ultrasonic Wave Propagation

With advances in technology and people’s increasing emphasis on health issues, there has been a rapid development of wearable and implantable biomedical sensors. However, radio frequency waves dominate wireless communications, despite disadvantages such as high attenuation in the human body, considerable power consumption, and complicated wireless antenna design, which has hampered the developm...

Modeling Ultrasonic Wave Propagation Through the Kidney