Browsing Produção Intelectual em Bases Externas by Author "Koiller, Jair"
Now showing items 1-9 of 9
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Acoustic streaming, the 'small invention' of cyanobacteria?
2010-12Micro-engineering pumping devices without mechanical parts appeared 'way back' in the early 1990's. The working principle is acoustic streaming. Has Nature 'rediscovered' this invention 2.7 Gyr ago? Strands of marine ... -
Could cell membranes produce acoustic streaming? Making the case for synechococcus self-propulsion
2011-04Sir James Lighthill proposed in 1992 that acoustic streaming (AS) within the mammalian cochlea could play a role in the transmission of acoustic signals to the auditory sensory cells. Microelectromechanical devices for ... -
Micro-swimming without flagella: propulsion by internal structures
2011-12Since a first proof-of-concept for an autonomous micro-swimming device appeared in 2005 a strong interest on the subject ensued. The most common configuration consists of a cell driven by an external propeller, bio-inspired ... -
Nonholonomic systems via moving frames: cartan equivalence and chaplygin hamiltonization
2005A nonholonomic system, for short “NH,’’ consists of a configuration space Qn, a Lagrangian L(q, q, t), a nonintegrable constraint distribution H ⊂ TQ, with dynamics governed by Lagrange-d’Alembert’s principle. We present ... -
On the dynamic Markov-Dubins problem: from path planning in robotics and biolocomotion to computational anatomy
2013-01Andrei Andreyevich Markov proposed in 1889 the problem (solved by Dubins in 1957) of finding the twice continuously differentiable (arc length parameterized) curve with bounded curvature, of minimum length, connecting two ... -
Rubber rolling over a sphere
2007-04Rubber coated bodies rolling over a surface satisfy a no-twist condition in addition to the no slip condition satisfied by 'marble' coated bodies [1]. Rubber rolling has an interesting differential geometric appeal because ... -
Self-propulsion of N-hinged 'Animats' at low Reynolds number
2003Optimal locomotion of micro-organisms (on a small Reynolds number flow) can be regarded as a sub-riemannian geometry on a principal bundle with a mechanical connection. Aiming at robotic applications, flagella are modeled ... -
Vector borne diseases on an urban environment: the effects of heterogeneity and human circulation
2017-06We study the effect of human circulation and host/vector heterogeneities on the onset of epidemics of arboviruses. From a meta-population dynamics based on the classical Bailey-Dietz model, we derive a multi-group model ... -
Vortex pairs on surfaces
2009A pair of infinitesimally close opposite vortices moving on a curved surface moves along a geodesic, according to a conjecture by Kimura. We outline a proof. Numerical simulations are presented for a pair of opposite ...
