• The electrocardiographic effects of electrical activity in the heart are partially canceled by multidirectional spread of that activity. For example, the effect of excitation directed toward the right may be canceled by a similar process moving toward the left. The extent of such cancellation is of fundamental importance in electrocardiography. It is a measure of the extent to which cardiac e...

• The electrocardiographic effects of electrical activity in the heart are partially canceled by multidirectional spread of that activity. For example, the effect of excitation directed toward the right may be canceled by a similar process moving toward the left. The extent of such cancellation is of fundamental importance in electrocardiography. It is a measure of the extent to which cardiac e...

This invention involves method and apparatus for guiding ablative therapy of abnormal biological electrical excitation. In particular, it is designed for treatment of cardiac arrhythmias. In the method of this invention electrical signals are acquired from passive electrodes, and an inverse dipole method is used to identify the site of origin of an arrhytmia. The location of the tip of the abla...

The propagation of electrical activity in cardiac tissue can be modelled by reaction diiusion equations, where a tensor of diiusion coeecients represents anisotropy due to bre orientation, and excitation is represented by high order, stii diierential systems. The eeects of external electrical stimulation, as in artiical pacemakers, or in deebrillators, requires bidomain models, in which intra-a...

The interaction between synaptic and electronic excitation of cells from the salivary gland of the snail Helisoma trivolvis was studied using a voltage-sensitive merocyanine dye. Linear and square photodiode matrix arrays were used to record simultaneously the response to neuronal stimulation of 15-25 separate regions of the gland. Laterally opposed acini exhibited highly synchronous electrical...

Mechanical-electrical analogous circuit models are widely used in electromechanical system design as they represent the function of a coupled electrical and mechanical system using an equivalent electrical system. This research uses electrical circuits to establish a discussion of simple active vibration control principles using two scenarios: an active vibration isolation system and an active ...

Flexural transducers are well suited for power emission in fluids, thanks to their low mechanical impedance. Their performance is nevertheless compromised by the occurrence of non-linearities stemming from high-deflection andlor high electric field. This experimental work catalogs typical alterations of the transducers' dynamics resulting specifically from high electrical field non-linearities....