Overall in this article, English is acceptable but there is still some mistake. For example at line 3 (page 2) "base of" should be "base on", line 13 "Let us....'' this is not the sentence. At line 5 (page 4) "whether of" should be "whether on" , at line10 (page 7) "After we our test..." this is not the sentence.
I would recommend the author to recheck on English carefully especially on grammar.