Efficient driving of piezoelectric materials is desirable when operating transducers for biomedical applications such as high intensity focused ultrasound (HIFU) or ultrasound imaging. More efficient operation reduces the electric power required to produce the desired bioeffect or contrast. Our preliminary work [Cole et al. Journal of Physics: Condensed Matter. 2014;26(13):135901.] suggested th...

A fast multipole boundary element method (FMBEM) for 3D multi-domain acoustic scattering problems based on the Burton–Miller formulation is presented in this paper. A multi-tree structure is designed for the multi-domain FMBEM. It results in mismatch of leaves and well separate cells definition in different domains and complicates the implementation of the algorithm, especially for precondition...

Objective. To study the major acoustic properties of prototype bionic ear developed in order to confirm its functional performance.
 Materials and methods. Acoustic were measured using Random Phase MultiSine signal a test bench, which simulated implant-emitter-osseous tissue-inner system. The resulting pulse response was converted target characteristics: FR group lag. Experiments carried o...

To assess and optimise the effect of multi-layered trim for the reduction of noise and vibration transmission, design engineers greatly depend on CAE tools. Mostly, these are based on element based simulation techniques such as the Finite Element Method (FEM). In practise, however, these methods are limited to low-frequency simulations due to the strongly increasing computational cost with freq...

The main role of WSN is to collect information from various resources and to transfer them to the destination. The important thing is to know the location of the destination, which can be obtained through localization technique in WSN. It is highly desirable to design efficient, low-cost and measurable localization mechanism for under water acoustic WSN. Mostly, in under water acoustic WSN the ...

A diagonal form fast multipole boundary element method (BEM) is presented in this paper for solving 3-D acoustic wave problems based on the Burton–Miller boundary integral equation (BIE) formulation. Analytical expressions of the moments in the diagonal fast multipole BEM are derived for constant elements, which are shown to be more accurate, stable and efficient than those using direct numeric...

This work explores the historical effectiveness of efficiency improvements in reducing humankind’s consumption of energy resources. Ten activities are analyzed, including pig iron production, aluminum production, nitrogen fertilizer production, electricity generation from coal, electricity generation from oil, electricity generation from natural gas, freight rail travel, passenger air travel, m...