We hypothesized that the occurrence of spontaneous Ca2+ release from the sarcoplasmic reticulum (SR), in diastole, might be a mechanism for the saturation of twitch potentiation common to a variety of inotropic perturbations that increase the total cell Ca. We used a videomicroscopic technique in single cardiac myocytes to quantify the amplitude of electrically stimulated twitches and to monito...

This paper recommends a simple and excusive approach to strongly nonlinear oscillator. Its frequency property can be immediately obtained by the simplest calculation. The results show that method leads an approximate solution with relatively high accuracy. Considering process, this provides highly efficient tool for fast determination of amplitude-frequency relationship large amplitude vibratio...

Short-period body waves recorded at teleseismic distances from great earth· quakes provide information about source rupture processes and strong motions. First, we examine mostly WWSSN records of 19 earthquakes of moment magni· tude Mw of 6.5 to 9.5. Four parameters are measured from the short-period Pwave train: the maximum amplitude; the period at maximum amplitude; the time between the first...

Stochastic property of speech signal is a fundamental research topic in speech analysis and processing. In this paper, multiple levels of randomness in speech signal are discussed, and the stochastic properties of unvoiced pronunciation are studied in detail, which has not received sufficient research attention before. The study is based on the signals of sustained unvoiced pronunciation captur...

Circadian rhythms help organisms adapt to predictable daily changes in their environment. Light resets the phase of the underlying oscillator to maintain the organism in sync with its surroundings. Light also affects the amplitude of overt rhythms. At a critical phase during the night, when phase shifts are maximal, light can reduce rhythm amplitude to nearly zero, whereas in the subjective day...

In many signal processing applications, an appropriate measure to compare two signals plays a fundamental role in both implementing the algorithm and evaluating its performance. Several techniques have been introduced in literature as similarity measures. However, the existing measures are often either impractical for some applications or they have unsatisfactory results in some other applicati...