The absorption performance of anechoic coatings depends on the material properties, layer thicknesses and cavity distribution density and cavity size. In this paper a design method based on numerical simulation was presented by combining FEM and acoustic duct method (ADM).  Analyzing of anechoic coatings was performed under active sonar impinging plane wave by normal incident angle. In thi...

Resonant structure is one of the proposed methods in combining power in RF systems of  RF accelerators. In this structure, fabrication of RF power divider or combiner using coaxial and cylindrical cavity is important. In this study, two combiners, in the same frequency band, are designed and fabricated; and their results are compared. The experimental results confirmed the simulation results an...

Considering the challenges in fabrication and electromagnetic characterization of linear accelerator tube, first four major effective parameters in cavity fabrication, including cavity material, dimension agreement, surface roughness and concentricity of cavities have been studied. Then, considering appropriate electromagnetic properties, fabrication results of cavities, techniques for their re...

Here we report a case of co-infection of hydatid cyst with invasive apergillosis, in a previously healthy, non immunocompromised, 26year old man. Chest x-ray revealed a large cystic cavity in left upper lobe of lung histopathologic examination of the specimen confirmed the diagnosis of hydatid cyst with numerous fungal hyphea which invaded the laminated wall of the cyst. Although, co-infection ...