Even though biological legs operate amazingly springlike, they clearly deviate from a perfect spring. For instance, experimental data of human hopping and running suggest an increase in leg length and a decrease in leg stiffness between touchdown and takeoff. Here, this variability of human gait is considered as a fundamental system property and introduced via non-constant leg parameters to a 1...

We study the dynamics of a particle in continuous time and space, the displacement of which is governed by an internal degree of freedom (spin). In one definite limit, the so-called quantum random walk is recovered but, although quite simple, the model possesses a rich variety of dynamics and goes far beyond this problem. Generally speaking, our framework can describe the motion of an electron ...

The determination of power using isokinetic testing has been shown to be highly reliable. However, isotonic and isokinetic testing involve specific mechanical constraints that likely necessitate different neuromuscular strategies. Therefore, the purpose here was to establish test-retest intrarater reliability (separated by 7 days) of loaded maximal shortening velocity and velocity-dependent pow...

Compressional and shear velocities of rocks are dependent on frequency and this dispersion may be significant even within the seismic band. The amount and position of dispersion will be largely a function of fluid properties, distribution, and motion in the pores. Velocities are thus directly coupled to rock permeability and pore compliance. Propagation often will be in the high frequency regim...

Cutaneous sensory thresholds were measured at the index fingertipof eight normal subjects. Electric shocks were applied with the finger at rest or tracking a target, which oscillated at one of three frequencies. For each subject, the sensory threshold was positively correlated with the frequency of oscillation. The correlations between sensory suppression and speed of movement agree with previo...

This work contains a discussion of the Vlasov approximation for the system of particles interacting not only via the pair-wise central potential, but also via the velocity dependent interactions (V.D.I). The VDI are assumed to be similar in nature to those encountered in the classical plasma when the higher order in (v/c) corrections to the Coulomb forces are taken into account. Using the Klimo...

This study investigates the application of image methodology to velocity-dependent wave systems. Special Relativity is used for the analysis of waves scattered by arbitrary moving objects in the presence of a perfectly-conducting plane-interface. The various scenarios considered involve geometrical, material, and kinematic symmetries. Cases discussed include free-space, material media at-rest, ...

This purpose of this article is to highlight the various aspects of a dynamic model of gravitational interaction proposed by the author in an earlier paper. A number of interesting results are obtained when the proposed velocity and acceleration dependent inertial induction terms are used in conjunction with an extended v ersion of Mach's principle. Universal induction results in exact equivale...

A new approach for characterization of agarose gel permeability under compression at different loading velocities is proposed. Uniaxial compression tests on thin agarose gel specimens in a rigid porous confinement cell immersed in a water bath are undertaken. The equilibrium response of the gel, which is assumed to be achieved under extremely low-loading velocity (of the order of tens nanometer...

We investigated in a study whether humans’ sensitivity to curved walking is affected by their walking velocity. Amongst other techniques, redirecting users of an immersive virtual environment on a curved path is part of the so-called ’Redirected Walking’. We conducted an experiment in which 12 participants walked specific curvatures at given speeds in a VR. We found that people are significantl...