We consider the 3-D system defined by jerk equation $\dddot{x} = -a \ddot{x} + x \dot{x}^2 -x^3 -b c \dot{x}$, with $a, b, c\in \mathbb{R}$. When $a=b=0$ and $c < 0$ equilibrium point localized at origin is a zero-Hopf equilibrium. analyse Bifurcation that occur this when we persuade quadratic perturbation of coefficients, prove one, two or three periodic orbits can born parameter goes to $0$.

Involuntary movements in a patient with Sydenham's chorea were usually characterised by bursts of EMG activity lasting more than 100 ms, occurring asynchronously in antagonist muscles. The "hung-up" knee jerk was a choreic movement induced by the tendon tap. Exaggerated voluntary movements were produced with EMG burst longer than normal.

Chaos in a fractional-order jerk model using hyperbolic tangent nonlinearity is presented. A fractional integrator in the model is approximated by linear transfer function approximation in the frequency domain. Resulting chaotic attractors are demonstrated with the system orders as low as 2.1.

25 We permanently deal with gravity force. Experimental evidences revealed that moving 26 against gravity strongly differs from moving along the gravity vector. This directional 27 asymmetry has been attributed to an optimal planning process that optimizes gravity force 28 effects in order to minimize energy. Yet, only few studies have considered the case of vertical 29 movements in the context...

The most important mechanism for gradation of muscle contraction is recruitment of new motor units with increasing effort. Whether voluntary and reflex contractions engage the different motor units in a similar order is not known. Since this question is not only of considerable physiological interest but also has clinical implications, we have compared the order in which the motor units are act...

We have examined the kinematics of the initial trajectory of step-tracking movements performed by human subjects. Each subject tracked a target that required 5-30 degrees of radial or ulnar deviation of the wrist. All movements were to be performed as accurately as possible. Speed instructions were given before each trial. When subjects performed different amplitude movements following the same...

During rapid eye movement sleep, the forelimb muscles of newborn rats jerk and twitch in an organized pattern, the fidelity of which improves with time. The coordinated nature of such sleep movements may instruct the developing brain how to more effectively execute movements during wakefulness.

Many new chaotic systems with algebraically simple representations are described. These systems involve a single third-order autonomous ordinary differential equation ~jerk equation! with various nonlinearities. Piecewise linear functions are emphasized to permit easy electronic implementation with diodes and operational amplifiers. Several new simple and robust chaotic electrical circuits are ...

In winning second prize in the Logie Medical Ethics Essay Contest in 1997, Carolyn Rosenczweig raised questions about the role patients' family members should be allowed to play during resuscitative efforts by medical staff. She concluded that even though their presence might complicate resuscitation attempts, "blanket policies that exclude all relatives from being present seem a knee-jerk reac...

Red, Edward, "A dynamic optimal trajectory generator for Cartesian Path following" (2000). All Faculty Publications. Paper 589. SUMMARY This paper considers a dynamic and adaptive trajectory generator for negotiating paths using S-curves. Applying constant jerk transitions between the constant acceleration and deceleration periods of the trajectory, the trajectory will optimally transition to t...