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Lecturers participate in a scientific conference from college of education in U.S.A
Dr. Sami salman , dr. ismaiel Abdullah and samaa abd alsattar . lecturers at physics department in college of education in the ninty nine annual scientific conference for Arkinsas academy for sciences which hosted by hunderson university in arkinsas , they presented these researches A study of the correlations between bulge luminosity and the maximum rotation velocity for spiral galaxies A study of the relation between the spiral arm pitch angle and the momentum parameter of host spiral galaxies