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In this paper boundary layer flow over a permeable sheet due to an impulsive quadratic stretching and linear cross flow is considered. The governing equations are solved numerically using an implicit finite difference method of Crank-Nicholson type. The steady state solutions are compared with available results in the literature. Profiles of velocity, skin friction are presented for various values...
Dynamic modeling is of great importance regarding computer simulation and advanced control of parallel manipulators. Dynamic modeling of parallel manipulators presents an inherent complexity, mainly due to system closed-loop structure and kinematic constraints. In this paper an approach based on the manipulator generalized momentum is explored and applied to the dynamic modeling of a...
This work deals with the numerical simulation of air stripping process for the pre-treatment of groundwater used in human consumption. The model established in steady state presents an exponential solution that is used, together with the Tau Method, to get a spectral approach of the solution of the system of partial differential equations associated to the model in transient state.
We describe three different but related scenarios for determination of asset prices in an incomplete market: one scenario uses a market game approach whereas the other two are based on risk sharing or regret minimizing considerations.
Automatic positioning devices are worldwide used in tasks like handling or assembly, making them key components of modern manufacturing systems. Pneumatic solutions are usually less expensive than their electrical counterparts, are more reliable and require less maintenance. However, the complex nonlinear nature and high model order of pneumatic systems lead to a very difficult control task. This...
In this work we study multiple related (multivariate) time series from worldwide markets. We search for signs of coherence and/or synchronization using the main index as representative of the whole market. In order to better understand the relations between the time series we use two different techniques, entropy and variance-covariance matrices. We apply each procedure in a time dependent way to...
This paper presents a study of the singular manifold of the six-degree-of-freedom parallel manipulator commonly known as the Stewart platform. We consider a platform with base vertices in a circle and for which the bottom and top plates are related by a rotation and a contraction. It is shown that in this case the platform is always in a singular configuration and that the singular manifold can be...
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