A theoretical and protection study was conducted of the corrosion behavior of carbon steel surface with different concentrations of the derivative (Quinolin-2-one), namely 7-Ethyl-4-methyl-1-[(4-nitro-benzylidene)-amino]-1H-quinolin-2-one (EMNQ2O). Theoretically, Density Functional Theory (DFT) of B3LYP/ 6-311++G/ 2d, 2p level was carried out to calculate the geometrical structure, physical properties and chemical inhibition chemical parameters, with the local reactivity in order to predict both the reactive centers and to know the possible sites of nucleophilic and electrophilic attacks, in vacuum and two solvents (DMSO and H2O), all at the equilibrium geometry. Experimentally, the inhibition efficiencies (%IE) in (3.5% NaCl) and (0.5M HCl) solutions were studied using potentiometric polarization measurements. The results revealed that the (%IE) in the salty solution (94.98%) is greater than that in the acidic solution (81.40%). The thermodynamic parameters obtained, supported the physical adsorption mechanism and the adsorption followed the Langmuir adsorption isotherm. The surface changes of the carbon steel were studied using SEM (Scanning Electron Microscopy) and AFM (Atomic Force Microscopy) techniques.
دور وزارة الخارجية الامريكية في عملية صنع القرار
مشكلة البحث:- تواجه المجتمعات العربية في المرحلة الراهنة ,تحديات كبيرة تستهدف الشاب العربي ،والتأثير عليه في الجوانب الاجتماعية والتربوية والثقافية والاقتصادية والأمنية والسياسية ولغض تسليط الأضواء على هذه الجوانب ولاسيما الجانب الاجتماعي،من هنا تبرز مشكلة البحث الحالي في التعرف على توقعات الشباب العربي لمشكلاتهم الاجتماعية في المرحلة الراهنة .
أهمية البحث:-
... Show MoreLiterary heritage and its employment in poetry has received the attention of poets, and they have employed it in their literary texts, as this employment is one of the oldest phenomena in Arabic literature, that the inspiration of this heritage in texts through the overlap of their texts with previous texts, and no poet neglected the importance of this employment. The ancient critics determined that the poet’s special culture is represented in the necessity of taking from the ancients, and this taking is the reference from which the poet draws his material and idea, as well as to clarify the meaning and its significance
This research paper sheds light on the stages of Atmospheric forecast in Iraq. It was found that atmospheric forecast in Iraq has passed through several successive and interrelated historical stages. Each stage is characterized by special methods of prediction that are different from other stages. The oldest stages used astronomy to forecasting cases of cold , heat, flood and drought
يهدف هذا البحث الموسوم بـ (المنهج النقدي في كتاب الرجال للنجاشي(ت 450هـ )إلى تسليط الضوء على حياة النجاشي ومكانته العلمية والكشف عن منهجه النقدي في كتابه المذكور.
من المتفق عليه أن هناك طريقا واحدا لنشر الثقافة والقضاء على الجهل هو التعليم .ولعل أبرز ماشهدته مدينة بغداد من تطور هو ظهور المدر سة ومن ثم إنتشارها بشكل كبير وفق المفهوم الحديث مما أثرفي عموم الحياة اليومية ، ومن ضمنها التعليم العالي .إن الإستقرار من أهم ماتحتاجه الجامعة للقيام بواجباتها ولايأتي الإستقرار إلا بالإستقرار الذي يضمن لنا أن تكون الجامعة بعيدة عن ما قد يستجد من الأهواء و النزاعات.
There are many researches deals with constructing an efficient solutions for real problem having Multi - objective confronted with each others. In this paper we construct a decision for Multi – objectives based on building a mathematical model formulating a unique objective function by combining the confronted objectives functions. Also we are presented some theories concerning this problem. Areal application problem has been presented to show the efficiency of the performance of our model and the method. Finally we obtained some results by randomly generating some problems.
- Aim of the current research is to know the impact of guided discovery strategy sports communication skills among students in first grade average in mathematics.
- , Consisted sample of (58) a student from a school Baghdad Rusafa, divided in two groups, one experimental studied according to strategy discovery The second group studied the traditional way, the researchers built search tool (test communication skills sports), and using a number of statistical methods including : -
- Test (t - test) was used to independent samples to examine the match Mediterranean experimental and control groups and tested Levin (Leven - test
The intellectual and revolutionary movements that have emerged since the beginning of the second half of the first century of the Islamic era did not appear suddenly, but must have preceded by a social consciousness, multi-forms, in the forefront of class awareness and religious awareness, and awareness was more painful, Of the society of the Arabian Peninsula - before Islam - feel it and suffer from it, a sense of injustice and tyranny, oppression and humiliation, and the destruction of dignity as well as poverty and hunger, and the injustice of tribal laws, and tyranny of each other and the tyranny of their heads on the tribes members and families belonging to this tribe or hill
The role of the Abbasid Caliphate in strengthening the business with the Indian subcontinent and development. Came upon Baghdad and the shift of succession to Iraq in the forefront of efforts made by the Abbasids to revive the trade with Eastern countries, given that the commercial was targeted among other factors,'s location in Iraq amid the ancient world among the countries of Turk