In this paper, we aim to study nonlinear time-periodic systems using the Koopman operator,
which provides a way to approximate the dynamics of a nonlinear system by a linear time …

The functioning of the heart rhythm can exhibit a wide variety of dynamic behaviours under
certain conditions. In the case of rhythm disorders or cardiac arrhythmias, the natural rhythm …

Cardiac rhythms are related to heart electrical activity, being an essential aspect of the
cardiovascular physiology. Usually, these rhythms are represented by electrocardiograms …

Mathematical models of cardiac electrical activity are one of the most important tools for
elucidating information about heart diagnostics. In this paper, we present an efficient …

Biological rhythm is an essential characteristic of natural systems that can present regular or
irregular dynamics, which can be associated with normal or pathological functioning. In this …

The present work studies the dynamical behavior of the Van der Pol oscillator with sine
nonlinearity subjected to the effects of non-sinusoidal excitations through the analysis of …

India is one of the worst hit regions by the second wave of COVID-19 pandemic and 'Black
fungus' epidemic. This paper revisits the Bombay Plague epidemic of India and presents six …

The heart rhythm is one of the most interesting aspects of the dynamic behavior of biological
systems. Understanding heart rhythms is essential in the dynamic analysis of the heart. Each …

Heartbeat rhythms are related to a complex dynamical system based on electrical activity of
the cardiac cells usually measured by the electrocardiogram (ECG). This paper presents a …

Cardiac rhythms are related to heart electrical activity, being the essential aspect of the
cardiovascular physiology. Usually, these rhythms are represented by electrocardiograms …