It is traditionally assumed that impulse propagation in cardiac muscle is determined by the combination of two factors: (1) the active properties of cardiac cell membranes and (2) the passive electrical characteristics of the network formed by cardiac cells. However, advances made recently in the theory of generic excitable media suggest that an additional factor-the geometry of excitation wave...

The surface currents on a two-wire transmission line induced by incident field excitations are investigated using the spectral concept. A simple solution is obtained for plane wave excitation. A solution for voltage source excitation, in which the induced current may be given, at least approximately, by means of the so-called leaky-wave concept, is considered. The influence of the electrical di...

An animal model was established for invivo studies of the EMG responses of a parturient uterine smooth muscle tissue to electrical stimuli. Five normally gravid sheep were fitted with implanted electrodes to register EMG signals and electrical stimulation. EMG signals were detected at the cervix and at the gravid horn. Spontaneous EMG activity was registered simultaneously with EMG responses to...

The general working hypothesis of this study was that muscle fatigue and force recovery depend on passive and active fluxes of Na(+) and K(+). This is tested by examining the time-course of excitation-induced fluxes of Na(+) and K(+) during 5-300 sec of 10-60 Hz continuous electrical stimulation in rat extensor digitorum longus (EDL) muscles in vitro and in vivo using (22)Na and flame photometr...

The absolute calibration of a piezoelectric transducer refers to the determination of the relationship between the electrical and acoustical quantities for a transducer coupled to a solid. It is shown how a well-characterized ultrasonic system, consisting of source,structure and receiver can be used to make such measurements for transducers operating as sources or receivers. Results are given, ...

The analysis of evoked potentials of sensorimotor cortex in response to electrical stimulation of n. ischiadicus shows that the extremal factor hypokinesia has a negative impact on the dynamics of formation of amplitudal and temporal characteristics since eyes openning in 2-weeks old rats. The most vulnerable process to the impact of hypokinesia is the first-positive phase, which disappears in ...

Purpose – The purpose of this paper is to present an analysis of common mode oscillations of several kilohertz in electrical drive systems. The analysed oscillations occur especially in electrical drive systems with active front end (AFE), common DC link and long motor cables and are independent of the well-known reflection phenomenon. Owing to the resulting overvoltages, the motor isolation li...

The effect of vagal stimulation on activity of afferent sympathetic nerve fibers from the dog's left ventricle has been examined. During partial constriction of the coronary artery, a brief electrical stimulation of the cervical vagus nerves resulted in a decrease in blood flow of the constricted artery, systolic bulge of the left ventricle, elevation of the ST segment of electrocardiogram and ...

This paper proposes a novel approach for coherent generators online clustering in a large power system following a wide area disturbance. An interconnected power system may become unstable due to severe contingency when it is operated close to the stability boundaries. Hence, the bulk power system controlled islanding is the last resort to prevent catastrophic cascading outages and wide area bl...

The analysis of evoked potentials of sensorimotor cortex in response to electrical stimulation of n. ischiadicus shows that the extremal factor hypokinesia has a negative impact on the dynamics of formation of amplitudal and temporal characteristics since eyes openning in 2-weeks old rats. The most vulnerable process to the impact of hypokinesia is the first-positive phase, which disappears in ...