in this thesis, barium ferrite nano particles were prepared by sol-gel method. their structural and magnetic properties of samples have been investigated using thermo gravimetric analysis (tg-dta), x-ray powder diffractometer (xrd), fourier transform infrared (ftir), scanning electron microscopy (sem), field emission scanning electron microscopy (fesem), ac susceptometer, vibrating sample magne...

the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...

  According to the standing points & principles of Recognition in Islamic unitary thought, the most important angle from which every subject (such as: theory of Islamic Architecture & Urbanism) is to study, define & analisis, is the angle of reason and wisdom. Achieving the clear, truthful & real knowledge, the Moslem artist, architect and/or urban designer studies the “Malakoot-i Wojood” (the ...