Jorge Luis Bustamante

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Thin films of colloidal semiconductor nanocrystals (NCs) are inherently metatstable materials prone to oxidative and photothermal degradation driven by their large surface-to-volume ratios and high surface energies. (1) The fabrication of practical electronic devices based on NC solids hinges on preventing oxidation, surface diffusion, ripening, sintering,(More)
In this work, the design of an adaptive control algorithm for a general class of underwater vehicles with manipulator in the context of a path-following problem is presented. The algorithm is based on speed-gradient techniques and state/disturbance observer. A stepwise changing mass is assumed during the operations of the vehicle manipulator. The influence(More)
In this work an algorithm for on-line estimation of the nonlinear hydro-dynamics in underwater vehicles is presented. The algorithm is able to estimate physical parameters from natural operation signals. Identifiability and convergence of the parameter trajectories are analyzed. The application of the algorithm to a spherical vehicle is described with(More)
UNLABELLED Epineural stitches are a means to avoid tension in a nerve suture. We evaluate this technique, relative to interposed grafts and simple neurorraphy, in a rat model. METHOD Twenty rats were allocated to four groups. For Group 1, sectioning of the sciatic nerve was performed, a segment 4 mm long discarded, and epineural suture with distal(More)
Insect antennae are important mechanosensory and chemosensory organs. Insect appendages, such as antennae, are encased in a cuticular exoskeleton and are thought to bend only between segments or subsegments where the cuticle is thinner, more flexible, or bent into a fold. There is a growing appreciation of the dominating influence of folds in the mechanical(More)
This paper is concerned with the design of a vision-based algorithm for on-line estimation of position and rate control errors in the guidance of autonomous underwater vehicles for path tracking of underwater lines. The algorithm uses techniques of pattern recognition with different degrees of morphological operations. Ad-hoc experiments with a subaquatic(More)
OBJECTIVE To make a description of the anatomy of fontanelles and to update what is currently known about their applications. METHOD 7 cadaveric heads, 2 dry skulls and 2 frontal bones of foetus were used, and 48 anterior fontanelles from paediatric patients with or without associated pathology were examined. Surgical cases and neurosonography were also(More)