This study deals with the corrosion inhibition of metal corrosion process of medium carbon steel using 1M HCl for kinetic studies and rate reaction determination. The weight loss method is applied to pieces of Medium carbon steel divided to Cubans with dimensions (0.4*2*2.4) cm , and use Tafel Extrapolation Method, the samples were polished using carbide silicon paper with dimensions of (180,200,400,600,800,1000). The samples were immersed in the alcoholic medium ethanol at a temperature 293K for 3hr. Natural inhibitor Kujarat Tea (Hibiscus sabdarriffa L.) is used which is extracted in aqueous and alcoholic medium, different concentrations (1000،2000, 3000) ppm have been used ; The best concentration found through the results is a concentration found that is 1000 and 2000 ppm, the results indicate that the highest degree of inhibition for aqueous extract is 93.3% with the concentration of 2000 ppm and 90.5% with 1000 ppm at293K. While the alcoholic inhibitor shows the highest efficiency 92.4% with a concentration of 2000 ppm and 88.6% with a concentration of 1000 ppm respectively. The structure of the inhibitor was investigated using infrared spectroscopy (FTIR), and the surface morphology of the tested samples was investigated using a scanning electron microscope (SEM).
The importance of this topic highlights through a multitude of research studies that addressed which attempted to determine the concepts and various dimensions and aspects which essentially associated with the intellectual background and the extraordinary specialization of the researcher or student or the angle of view that adopted to deal with this
السطح الكروي (Spherical Surface) السطح الكروي هو سطح منحني جزء من كرة . يسمى السطح الكروي محدب (convex surface) اذا كان مركز التكور له على اليمين ، ويسمى السطح الكروي مقعر(concave surface) اذا كان مركز التكور له على اليسار كما في الشكل (1) . السطح الكروي الذي يفصل وسطين شفافين له خاصية تجميع او تفريق الاشعة الضوئية المنكسره عليه نتيجة قوانين الانكسار ، وتطبيق قانون سنيل على السطح الكروي باستخدام العمود المقام على مماس النقطة التي يحدث
... Show MoreWer es heute beabsichtige, eine detaillierte Arbeit über die Rezeption des Nibelungenliedes zu schreiben, könnte damit einfach mehrere Bände wahrnehmen. Deswegen wird es sinnvoller sein, den Forschungsprozess auf bestimmten, aber wichtigen Aspekten zu skizzieren. Darum kann nur unter strikter Beschränkung auf die Hauptrichtungen, Hauptprobleme und Hauptfiguren des Liedes gewagt werden.
Der irakische Kritiker Moḥammed Šawqi Moḥammed Ḫalifa bedankt sich bei den „Dichtern des 12.Jahrhunderts, weil sie uns die deutschen Epen übertragen haben.“[1] Diese Epen kann man auch als Mythen betrachten, in denen sich Sagen und Märchen vermischen.
By taking a quick look at the glory history of our nation and the current reality of it, we find that the difference is clear between how we used to be and what we have become. This is what I call the regression of civilization that happened to our Muslim nation.
تدريس السياسة الخارجية في جامعة بغداد
The physician's commitment to medical insight is affected by several factors that vary from patient to patient in terms of the nature of the disease, the severity of the disease, the age of the patient, and the purpose of undergoing medical intervention. There are circumstances surrounding patients that require the physician to reduce the insight towards them, by concealing medical information. The physician must firmly commit to expanding the scope of his vision to a wider extent than in normal medical work. Therefore, we will discuss in this regard the cases in which medical explanation is reduced and the cases that require confirmation in the following order.
الغنائية في الشعر ميخا يوسف ليبنزون
Context has a great value in determining meanings and understanding speech as well as it has a significant impact on interpretation of the sacred text (Holy Quran) since it needs to be carefully understood by knowing the different circumstances