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Considering that angiotensin-converting enzyme (ACE) plays an important role in the pathogenesis of multiple sclerosis (MS), while information on the levels of this enzyme in biological liquids is rather limited, the ACE levels in blood serum of 30 patients with clinically diagnosed MS and 30 healthy individuals of comparable ages were measured using an enzymatic method (Biorexfars Chemical kits)...
A novel approach is presented to solve an algebraic problem related to complex finite element analysis of periodic structures. This approach turns the quadratic eigen problem into a linear eigen problem of the same dimension and also exploits the sparsity of matrices which reduces the computation time enormously. An algorithm is also proposed that generates the dispersion diagram automatically. The...
A recent 3-D finite element method allows the complex Floquet propagation constant of a periodic structure to be computed at a specified frequency by solving a sparse, generalized eigenvalue problem. To determine the propagation constant for a frequency range requires repeating this eigenanalysis at a large number of frequency points, which is computationally expensive. A model order reduction technique...
A novel approach is presented to solving an algebraic problem related to complex finite element analysis of periodic structures. This approach turns the quadratic eigenproblem with sparse and singular matrices into a standard eigenproblem of the same dimension and also exploits the sparsity of matrices which reduces the computation time enormously. An algorithm is also proposed that generates the...
In this paper, a reconfigurable antenna which operates at ISM band has been proposed, which is based on EBG materials. The antenna scans the elevation plane with a 90 degree step. The antenna is formed of an omnidirectional feeding element surrounding by two layers of EBG surfaces in four sides. The reconfigurability in the proposed antenna is achieved by using diodes in the EBG surfaces. Switching...
In this paper a new UWB antenna is proposed which is a printed slot antenna feeding by a 50 ohm CPW line via a circular microstrip patch. This antenna has a parasitic curve slot etched on the circular patch which makes a notch between 5 GHz and 6 GHz which is the work frequency of Wireless local area networks. The notch is explained by presenting the current distribution in the antenna and indicating...
This paper presents a novel and still simple method for odometry errors measurement and compensation. For a typical differential drive mobile robot, the three dominant and systematic error sources (unequal wheelspsila diameter, imprecise average wheels diameter and uncertainty about the effective wheelbase) are investigated. It is shown that the mobile robot, calibrated by using the proposed algorithm,...
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