C. Vázquez

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The numerical solution of several mathematical models arising in financial economics for the valuation of both European and American call options on different types of assets is considered. All the models are based on the Black-Scholes partial differential equation. In the case of European options a numerical upwind scheme for solving the boundary backward(More)
OBJECTIVE To present a new simulator designed at the Minimally Invasive Surgery Centre (Cáceres) which offers an integral, effective and viable training system that can be used for learning microsurgical techniques. STUDY DESIGN A square methacrylate block was used. Animal jaws were fixed to the sides by means of butterfly screws. This block also has a(More)
A novel self-referencing fiber optic intensity sensor based on bending losses of a partially polished polymer optical fiber (POF) coupler is presented. The coupling ratio (K) depends on the external liquid in which the sensor is immersed. It is possible to distinguish between different liquids and to detect their presence. Experimental results for the most(More)
This work presents a parallel version of a complex numerical algorithm for solving an el-astohydrodynamic piezoviscous lubrication problem studied in tribology. The numerical algorithm combines regula falsi, ®xed point techniques, ®nite elements and duality methods. The execution of the sequential program on a workstation requires signi®cant CPU time and(More)
Many recent works have investigated the problem of extending a preference over a set of alternatives to its power set, in an attempt to provide a formal representation of the notion of freedom of choice. In general, results are limited to the finite case, which excludes, for instance, the case of economic environments. This paper deals with the possibility(More)
—In this work, a millimeter wave microstrip frequency-mixer design based on graphene is presented. The desired frequency mixing behavior is obtained using a nonlinear component consisting in a microstrip line gap covered by a graphene layer. The circuit includes microstrip filters that have been designed to obtain a high isolation between the input and(More)
Hydrodynamic lubrication problems in piezoviscous regime are usually modeled by the classical Reynolds equation combined with a suitable law for the pressure dependence of viscosity. By taking into account the pressure–viscosity dependence in the Stokes equation and to derive the Reynolds equation in the thin film limit, a new model has been proposed by(More)