GTD) are common among Nigerian women in their reproductive life. Gestational Trophoblastic Disease ( GTD): a 10 year review of. A comparison has been done between UTD numerical results and UAT (Uniform Asymptotic Theory of Diffraction) which is another uniform solution of GTD. As to the second drawback, a GTD uniform correction, the UTD (Uniform Theory of Diffraction) has been developed in the view of designing a generic model able to correctly simulate both specular reflection and diffraction. Experimental validation of these methods has been performed. ITD (Incremental Theory of Diffraction), a method developed in electromagnetism, has also been developed in elastodynamics to deal with small flaws. In order to address the first drawback, a 3D hybrid method using both GTD and Huygens secondary sources has been developed to deal with finite flaws. GTD notably presents two important drawbacks: it is theoretically valid for a canonical infinite edge and not for a finite one and presents discontinuities around the direction of specular reflection. This paper is especially focused on possible improvements of the Geometrical Theory of Diffraction ( GTD), one classical method used for modelling diffraction from scatterer edges.
There exist two main scattering phenomena: specular reflection and diffraction. The scattering of elastic waves from an obstacle is of great interest in ultrasonic Non Destructive Evaluation (NDE). International Nuclear Information System (INIS)
Ya Ufimtsev on PTD - two closely.Įlastodynamic models for extending GTD to penumbra and finite size flaws The year 2012 celebrates the 50th anniversary of the seminal works of J.B.
This paper reviews research in the Geometrical Theory of Diffraction ( GTD) and the Physical Theory of Diffraction (PTD) at the Technical University of Denmark (DTU).
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