text article 2018 eng Kerbala University 2304-1471 7 v. 13 no. 2018 8 8 https://phyes.uokerbala.edu.iq/article_146308_12f6f98bfa4eacdc4c996794e2f7a5dc.pdf text article 2018 eng Kerbala University 2304-1471 7 v. 13 no. 2018 9 10 https://phyes.uokerbala.edu.iq/article_146309_61c975f6eef1b2afe43f3f9d38e5118f.pdf