Askander Khalid Kaka

Koya University · Department of Physics

The wurtzite structure reported here was studied by using the large unit cell (LUC) method. Some of the physical properties of Aluminum Nitride (AlN) nanocrystal for 4, 8, 32, and 64 atoms per large unit cell are investigated. The lattice constant was shrinking with increasing the core size of the structure. Energy gap is increased with the increas...

We have simulated the electronic properties of wurtzite Indium Nitride by using density functional theory (DFT). The energy gap is size dependent at which Eg increase with decreasing the size of InN nanocrystals. Also the lattice constant behaves in the same way as energy gap do. The cohesive energy is also calculated for the InN nanocrystals for 4...

The equilibrium structure and the electronic properties of III­V zinc­blende AlP, InP semiconductors and their alloy have been studied in detail from first­principles calculations. To determine properties of indium Aluminum phosphide nanocrystals as a function at size and shape density functional theory at the generalized­gradient approximation lev...

Density functional theory at the generalized-gradient approximation level coupled with large unit cell method is used to simulate the electronic structure of zincblende indium phosphide nanocrystals that have dimensions 2-2.8 nm. Nanocrystals structure is divided into two parts core and surface. The calculated properties include lattice constant, e...

Wind energy is one types of the renewable energy sources, and using this energy to produce the electric energy economize much of money and effort where it is consider as a free, clean and easy use source. Wind energy is depend fundament on its speed, wherever increased the wind speed, increased its energy (kinetic energy), and by using wind turbine...

In this paper, copper oxide (CuO) thin films were deposited on polyimide plastic substrates by spray pyrolysis technique at different temperatures from 250 to 300°C. All the deposited films were characterized by X-ray diffraction (XRD) technique, ultraviolet (UV)-visible spectrophotometer, and hall effect measurements for the investigation of struc...

In present work, size variation effect of In1-xAlxP nanocrystal alloy on its ‎electronic properties has been performed by using Gaussian03w program with ‎the adjunct program GaussView3.0 depending on the density functional theory ‎‎(DFT) with STO-3G basis sets and generalized gradient approximation (GGA) ‎levels coupled with large unit cell (LUC) m...

Density functional theory at the generalized-gradient approximation level coupled with large unit cell method is used to simulate the electronic structure of zincblende indium phosphide nanocrystals that have dimensions 2-2.8 nm. Nanocrystals structure is divided into two parts core and surface. The calculated properties include lattice constant,...

Iterated function system fractals are created on the basis of simple plane transformations: scaling, dislocation and the plane axes rotation. The most important properties of fractals are self – similarity, where the fractal shape has magnitude limited from similarity so-called similarity ratio. The calculation methods of similarity ratio or magnif...

Fractal geometry is a new branch of modern mathematics. Using this geometry in antennas design improves the properties of these antennas. This thesis studies and analyzes the properties of some classical wire antennas and compares these properties with new properties after transfiguring them into fractal antennas. Classical dipole antenna have been...