Noel C. MacDonald

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This paper investigates manipulation tasks with arrays of microelectromechanical structures (MEMS). We develop a geometric model for the mechanics of microactuators and a theory of sensorless, parallel manipulation , and we describe eecient algorithms for their evaluation. The theory of limit surfaces ooers a purely geometric characterization of microscale(More)
Programmable force vector elds can be used to control a variety of exible planar parts feeders such as massively-parallel micro actuator arrays or transversely vibrating (macroscopic) plates. These new automation designs promise great exibility, speed, and dexterity|we believe they may be employed to position, orient, singulate, sort, feed, and assemble(More)
Programmable vector elds can be used t o c ontrol a variety of exible planar parts feeders. These devices can exploit exotic actuation technologies such as arrayed, massively-parallel microfabricated motion pixels or transversely vibrating macroscopic plates. These new automation designs promise great exibil-ity, speed, and dexterity|we believe they may be(More)
We report a technique for the alignment of self-assembled protein systems, such as F-actin bundles and microtubules, in a surface-modified titanium or silicon microfluidic device. Assembling filamentous protein systems in a confined geometry produces highly aligned samples for structural and mechanical studies. Biomolecular self-assembly can be investigated(More)
The impact of the convective fluid motion induced by the electric fields on the dielectrophoretic manipulation of particles is investigated theoretically and experimentally. By means of a simplified model a channel with a periodic array of microelectrodes we show that electroconvective flows induce the formation of traps for particles, providing a dynamical(More)
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