Advanced oxidation process (AOPs) prepares one of the important methods to degradation and removal the organic pollutants from aqueous solutions. AOPs method depends on the formation of hydroxyl radicals from hydrogen peroxide with a catalyst. In thi
s work we relied on Fenton reaction to removes the Methylene Blue (MB) using natural magnetite as catalyst. The time for degradation of MB solutions (volume 25ml) in the different concentrations (20, 40, 60, 80) ppm was determined. The maximum degradation of MB in the solution was achieved after 24h with UV irradiation and without any additions, the maximum degradation of MB with UV and in addition of magnetite was achieved after 18h, and with UV + H2O2 the process was took up 3.5h, when adding magnetite + H2O2 and using UV the process of degradation of MB was completed after 2.5 hour. The optimal conditions of the degradation process of MB were: when adding 0.15g magnetite + 0.2ml H2O2 using UV, and that for 25 ml value of MB.
The analytical relationship that gives the neutron beam flux does
not take into account the probability of decay. In this research, we
concluded the analytical relationship of the probability non decay
of free neutron during the passage of the sam
ple to be analyzed by
NAA. And the conclusion of the analytical relationship to the
probability of non-capture of the free neutron during the its passage
of the sample to be analyzed by NAA in a simpler method than the
previous conclusion. We conducted an application study to
investigate the effect of the probability non decay of free
neutrons, that flowing through sample, On the flux of transient
neutron beam, for neutron beam with various large thickness
samples and for different energies of neutrons. The effect of
probability of neutron decay on neutron beam flux could not be
negligible for all the energies which are bigger than of
thermal.
بنيت نظرية فرمي على افتراض أن الكتلة السكونية للنترينو تساوي الصفر. و قد جرت محاولات
عديدة لإختبار صحة الفرضية تجريبيا، إلا أن جميعها باءت بالفشل.
في مؤتمر النترينو المنعقد عام ١٩٩٠ ، اقترح D.W.Sciama النظرية التالية: إن الفوتونات الصادرة
عن تفكك
نترينوهات المادة المظلمة في درب التبانة تؤلف المنبع الرئيسي للتشرد الواسع الانتشار في
الوسط بين النجوم.
