Physics - Sciene

    Spinel-Aluminum composites are drawing greater attention due to their low density, excellent physical, mechanical and refractory properties. This work aims to study the preparing one of the most current conventional technique and sintering behavior of Spinel-Al composite through characterization of the physical, mechanical properties as well as XRD and microstructure of the synthesis Spinel-Al composite specimens.

A theoretical investigation is carried out by using an analytical expression for paraxial trajectory of an electron in a magnetic lens to estimate the optimum properties of the magnetic lens.The aberration coefficients of the magnetic lens are studied, such as the spherical, chromatic, radial distortion and spiral distortion aberration coefficients. The Glaser's bell-shaped model is adopted to represent the axial field distribution of magnetic lens.

    The recognition process is an important task in many applications of computer image analysis based on color or texture features. In this research, a texture recognition system has been introduced. The first stage is called the preprocessing stage. In this stage, a number of color transforms have been done on the training images to produce a set of bands (R, G, B, Gray, Y, I, Q, H, S, and V bands). From these bands, two sets of features vectors had been extracted, (i.e., density slicing and Fourier transform).