This research has presented a solution to the problem faced by alloys: the corrosion problem, by reducing corrosion and enhancing protection by using an inhibitor (Schiff base). The inhibitor (Schiff base) was synthesized by reacting of the substrates materials (4-dimethylaminobenzaldehyde and 4-aminoantipyrine). It was diagnosed by infrared technology IR, where the IR spectrum and through the visible beams proved that the Schiff base was well formed and with high purity. The corrosion behavior of carbon steel and stainless steel in a saline medium (artificial seawater 3.5%NaCl) before and after using the inhibitor at four temperatures: 20, 30, 40, and 50 C° was studied by using three electrodes potentiostat. The corrosion behavior was studied by cathode and anode polarization through which all corrosion parameters were investigated which include: corrosion current icorr (1341× 10-7- 5393 × 10-9A/cm2), corrosion potential Ecorr (-1.031- -0.227 mV vs SCE) , corrosion rates CR (0.658-0.007 mm.y-1), inhibition efficiency %IE (92-98%), and energy activation barriers Ea (4.709-26.733 kJ/mole). The thermodynamic and kinetic properties of the corrosion behavior of these two metals under study, which include: enthalpy ∆H*(2.153-24.176 kJ/mole), entropy ∆S*(-197 -156 J/mole), and free Gibbs energy ∆G*(59.87-74.56 kJ/mole) before and after using the inhibitor, were also studied.
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