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The first theory of feroelectric was produced by Devonshire in 1949, and a new approach proposed 10 years later by Cochran, linking fereelectric phenomena to the theory of elasticity in crystals. However, the metro-scopic mechanism responsinle for spontaneous polarization still remain largely unknown. In this paper a new technique has been proposed to increase the local field and a mathematical model...
PV systems are widely preferred as a potential alternate source of energy. This paper proposes a PV generation system which can be used to feed both AC as well as DC loads. The proposed system incorporates a multi-output boost converter that gives three outputs from single input. The multi-output boost converter is controlled using MPPT technique that enables it to function more effectively. From...
Polar NURBS surface is a kind of periodic NURBS surface, one boundary of which shrinks to a degenerate polar point. The specific topology of its control‐point mesh offers the ability to represent a cap‐like surface, which is common in geometric modeling. However, there is a critical and challenging problem that hinders its application: curvature continuity at the extraordinary singular pole. We first...
Quadratic Bezier curves are important geometric entities in many applications. However, it was often ignored by the literature the fact that a single segment of a quadratic Bezier curve may fail to fit arbitrary endpoint unit tangent vectors. The purpose of this paper is to provide a solution to this problem, i.e., constructing G1 quadratic Bezier curves satisfying given endpoint (positions and arbitrary...
This paper presents a new method on the intersection testing problem between an ellipsoid and an algebraic surface. In the new method, the testing problem is turned into a new testing problem whether a univariate polynomial has a positive or negative real root. Examples are shown to illustrate the robustness and efficiency of the new method.
Flowers are familiar in virtual scenes, however, the design of flower patterns is still mainly done by hand. To produce a number of flower color patterns required by a large scene can be very labor-consuming. In this paper, we present a biologically-motivated algorithm for modeling and visualization of flower color patterns. It is able to produce various flower color patterns with little user interaction...
This paper presents an improved algebraic pruning method for point projection for Bezier curves. It first turns the point projection into a root finding problem, and provides a simple but easily overlooked method to avoid finding invalid roots which is obviously irrelative to the closest point. The continued fraction method and its expansion are utilized to strengthen its robustness. Since NURBS curves...
Having a better way to represent and to interact with large geological models are topics of high interest in geoscience, and especially for oil and gas companies. We present the design and implementation of a visualization program that involves two main features. It is based on the central data model, in order to display in real time the modifications caused by the modeler. Furthermore, it benefits...
Recently, multi-processing has been shown to deliver good performance in rendering. However, in some applications, processors spend too much time executing tasks that could be more efficiently done through intensive use of new graphics hardware. We present a novel solution combining multi-processing and advanced graphics hardware, where graphics pipelines are used both for classical visualization...
The behaviour of polarization of dielectric materials has been the topic of considerable study and research for a long time. The results of extensive research work on some aspects of the said polarization have been reported in the past. But all the work which has been produced so far has been carried out under the influence of one kind of field only. In this paper polarization of dielectric materials...
Ageing of dielectric materials has been studied by several researchers under different conditions. The simultaneous application of both an electric and magnetic field on the behavior of ageing of dielectric materials has not been reported so far. In this paper the effect of both electric and magnetic fields on the life of dielectric materials (paraffin solid) has been reported and a mathematical model...
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