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We report on the solidification of a metastable colloidal melt of monodisperse, highly charged latex spheres. Light-scattering and video microscopy are used to study the growth velocities of crystals nucleated at the walls of the observation cell and in the bulk melt. The velocity observed for the planar (110) face of the body-centered cubic wall crystals v110 is found to be significantly smaller...
We here review some of our recent results on fluid-like and crystalline ordered colloidal suspensions. We have investigated the structure and the dynamical properties of strongly interacting charged latex particles. The interaction can be varied experimentally over a wide range and in a precisely controlled way. It gives rise to pronounced correlations between the particles, leading to ordered mesosocpic...
One of the most intriguing properties of colloidal systems is their ability of thinning or thickening under shear. The underlying physical mechanisms of non-linear rheometry may be the shear-induced formation and destruction of long-range positional and orientational order. Since only in rare cases comprehensive structure and velocity information is accessible from inside a viscosimeter, generally,...
Colloidal crystals of completely deionized suspensions of latex speres are subjected to oscillatory and steady shear, as well as to homogeneous and inhomogenous electric fields. Various resonant phenomena observed in such experiments are reported.
Background Pattern recognition (PR) based strategies for the control of myoelectric upper limb prostheses are generally evaluated through offline classification accuracy, which is an admittedly useful metric, but insufficient to discuss functional performance in real time. Existing functional tests are extensive to set up and most fail to provide a challenging, objective framework to assess the strategy...
A natural and intuitive operation of multifunctional upper limb prostheses involves the concurrent activation of multiple degrees of freedom in a proportional way. Several approaches to simultaneous and proportional control strategies have been investigated; provided outcome measures however were offline accuracy or error rates and lacked the functional component of a preclinical assessment. This...
Few studies have directly compared real-time control performance of pattern recognition to direct control for the next generation of myoelectric controlled upper limb prostheses. Many different implementations of pattern recognition control have been proposed, with minor differentiations in the feature sets and classifiers. An objective and generalizable evaluation tool quantifying the control performance,...
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