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Article
Prediction of Corrosion Inhibitor Efficiency of Some Aromatic Hydrizdes and Schiff Bases Compounds by Using Artificial Neural Network

Author: Hanan A. Radhy Al.Hazam حنان عبد الرضا الهزام
Journal: Iraqi National Journal Of Chemistry المجلة العراقية الوطنية لعلوم الكيمياء ISSN: 22236686 Year: 2009 Issue: 34 Pages: 297-302
Publisher: Babylon University جامعة بابل

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Abstract

Abstract Artificial neural networks are used for evaluating the corrosion inhibitor efficiency of some aromatic hydrazides and schiff bases compounds. The nodes of neural network input layer represent the quantum parameters, total negative charge (TNC) on molecule, energy of highest occupied molecular orbital (E Homo), energy of lowest unoccupied molecular orbital (E Lomo), dipole moment(μ), total energy (TE), molecular volume(V), dipolar-polarizability factor(Π) and inhibitor concentration (C). The neural network output is the corrosion inhibitor efficiency (E) for the mentioned compounds. The training and testing of the developed network are based on a database of 31 published experimental tests obtained by weight loss. The neural network predictions for corrosion inhibitor efficiency are more reliable than prediction using other conventional theoretical methods such as AM1, PM3, Mindo, and Mindo-3.

الخلاصة استخدمت تقنية الشبكة العصبية الصناعية في تقييم كفاءة تثبيط التاكل لبعض مركبات الهيدرازايد الاروماتية وقواعد شف . تضمنت عقد طبقة الادخال للشبكة معاملات كمية هي الشحنة السالبة الكلية (NTC) ،طاقة اعلى اوربيتال مملوء (اوربيتال هوموEH)،طاقة اوطا اوربيتال فارغ (اوربيتال لوموEL)،عزم ثنائي القطب (μ(،الطاقة الكلية (TE )،الحجم الجزيئي V ،عامل الاستقطاب (π)والتركيز المثبط C . بينما كانت عقد الطبقة الخارجية للشبكة تمثل كفاءةتثبيط التاكل (E) للمركبات المؤشرة اعلاه. واعتمد في تدريب واختيار الشبكة 31 قيمة عملية ناتجة من فقدان الوزن . ووجد من النتائج المستحصلة لكفاءة تثبيط التاكل ان تقنية الشبكة العصبية اكثر دقة من المحسوبة بالطرق النظرية الاخرى مثل Mindo3,Mindo,PM3,AMs.


Article
Corrosion - Resistance Characteristics of Concrete Containing Furfural

Authors: Ra' id Hasan Abbood --- Zain Al-Abideen Raouf --- Suhair kadhem Al-Hubboubi
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2012 Volume: 18 Issue: 4 Pages: 472-484
Publisher: Baghdad University جامعة بغداد

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Abstract

Corrosion inhibiting admixtures are unique among other methods to protect reinforced concrete from corrosion damage. In this study, the effect of furfural on the fresh and hardened properties of concrete mixes of 35 and 45 MPa compressive strengths as well as the corrosion inhibition of furfural was evaluated. Furfural was added at different dosages (1, 2 and 3% by weight of cement) with and without superplasticizer (HRWR). Different electrochemical measurements were performed (Half-cell potential, Tafel plot and linear polarization resistance). Electrochemical measurements confirmed that furfural dramatically reduces the rate of corrosion; the inhibition efficiencies were 62.7 and 63.8 % due to 3% furfural addition to 35 and 45MPa-concretes respectively. Results also showed that the combined presence of furfural and HRWR was found to provide an excellent corrosion protection to steel.

تعد مثبطات التآكل من الطرائق المهمة لحماية حديد التسليح من خطر التآكل.في هذه الدراسة تم تقييم تأثير الفورفورال على الخواص الطرية والمتصلبة لخلطات خرسانية ذات مقاومة انضغاط 35 و45 ميكاباسكال بالاضافة الى تقييم الفورفورال كمثبط لتآكل حديد التسليح .اضيف الفورفورال بعدة وزمات (2,1 و3%من وزن السمنت) مع وبدون الملدن المتفوق .اجريت عدة فحوص كهروكيميائية تضمنت (جهد نصف الخلية,بيانات تافل ومقاومة الاستقطاب الخطي ).بينت القياسات الكهروكيميائية ان استخدام الفورفورال ادى الى تقليل كبير للتآكل وان كفاءة التثبيط كانت 62.7 و63.8% نتيجة اضافة 3% للخرسانة ذات المقاومة 35 و45 ميكاباسكال على التوالي وبينت النتائج ايضا ان الاستخدام المشترك للفورفورال والمضاف الملدن المتفوق وفرت حماية ممتازة لحديد التسليح.


Article
Novel Corrosion Inhibition for Carbon Steel Alloy: Synthesis and Characterization
مانع تاكل جديد لسبيكة الكاربون ستيل. التركيب والمواصفات

Author: O. M. Abo- Elenien اسامة محمود ابو العينين
Journal: Tikrit Journal of Pure Science مجلة تكريت للعلوم الصرفة ISSN: 18131662 Year: 2006 Volume: 11 Issue: 1 Pages: 58-63
Publisher: Tikrit University جامعة تكريت

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Abstract

The inhibitor effect of Tri-ethoxysilyl-di-ethylphosphate (TEOSDEOP) on the corrosion resistance of carbon steel alloy A36 in distilled water, tap water, sea water and 1 M hydrochloric acid were investigated by weight loss and electrochemical methods. The results suggest that TEOSDEOP inhibition efficiencies provides 99.19% for 10 ppm, 98.35% for 20 ppm in distilled, tap and seawater, respectively. While 97.65% for 30 and 40ppm in acid media. The corrosion potential in open circuit and electrochemical at low inhibitor concentrations were shifted towards positive direction (i.e. cathodic protection). On the other hand at high inhibitor concentrations, the potentials were shifted towards negative direction (i.e. anodic protection). Also, the electrochemical impedance results indicated that the inhibition efficiency increased with increasing the inhibitor concentrations. The graphical SEM images of coupons immersed 3hs in 1MHCl were investigated.

درست قابلية تثبيط التاكل لثلاثي- ايثوكسي سلايل- ثنائي- ايثايل فوسفيت(TEGSDEOP) على مقاومة التاكل لسبيكة الكاربون ستيل A36 في الماء المقطر و ماء الاسالة ومياه البحر ومحلول حامض الهيدروكلوريك 1M بطريقتي فقدان الوزن والالكتروكيميائية.بينت النتائج ان كفاءة تثبيط التاكل الـ TEGSDEOP تصل الى 99.19% عند 10 ppm و 98.35% عند 20 ppm في الماء المقطر وماء الاسالة وماء البحر على التوالي. بينما تصل الى 97.65% عند 30 ppm و 40 ppm في الوسط الحامضي. ان جهد التاكل في حالتي الدائرة المفتوحة والالكتروكيميائية في تراكيز مثبط التاكل الواطئة تميل الى الاتجاه الموجب( حماية القطب الموجب). وبعبارة اخرى، في حالة تراكيز المثبط العالية يميل الجهد الى الاتجاه السالب( حماية القطب السالب). كما بينت نتائج الطريقة الكيميائية الكهربائية ان كفاءة التثبيط تزداد مع زيادة تركيز المثبط.


Article
Angiotensin Converting Enzyme Inhibitors, to Continue or Discontinue on the Morning Day of Surgery

Authors: Sabah Noori Al-saad --- Arkan Muhammed Mahdi
Journal: Iraqi Academic Scientific Journal المجلة العراقية للاختصاصات الطبية ISSN: 16088360 Year: 2013 Volume: 12 Issue: 2 Pages: 208-212
Publisher: The Iraqi Borad for Medical Specialization المجلس العراقي للاختصاصات الطبية

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Abstract

ABSTRACT: BACKGROUND:Angiotensin converting enzyme inhibitors(ACEI) play a pivotal role in the management ofhypertension(11). whether to continue or discontinue them before surgery is an everyday encounteredquestion of both surgeon & patient, this issue is continuously submitting to debate & controversy.OBJECTIVE: To compare between the incidence of intra-operative hypotension in hypertensive patients whocontinue to take ACEI. & those who discontinue, & are undergoing general anesthesia for non-cardiacsurgery.PATIENTS AND METHOD:A comparative study consist of 40 patients presented to the Medical City, Baghdad Teaching Hospital& Surgical specialty Hospital between July 2011,to March 2012.the age of patients range from 38-70years old, they were 10 (25 %) men and 30 (75 %) women , they were divided into two groups;according to mode of medication, cases ( who were continued taking medication ) and control (whowere discontinued medication),twenty patient each, all patients underwent different surgicalinterventions under general anesthesia, they were studied & monitored intra-operatively regardingdevelopment of hypotension, this was done at time interval of 5 minutes & at starting point prior toinduction of general anesthesia until 20 minutes after.RESULTS: By comparing the mean systolic blood pressure (SBP) and diastolic blood pressure (DBP) in betweenboth groups of patients, those who were continued ACEI (group A) or those who werediscontinued(group B), it had been found that no significant differences in mean SBP neither preoperativelynoratdifferenttimeintra-operatively.P.valueinallcomparisonswas>0.05.CONCLUSION:Continuingor discontinuing ACEI before non-cardiac surgery under general anesthesia has nostatistical significance regarding concern of developing intra-operative hypotension.


Article
Corrosion Inhibition of Steel (St 44-2) by Pomegranate Shells in Acidic Medium

Author: H.A. Abdullah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 4 Part (A) Engineering Pages: 399-405
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Pomegranate shells were investigated as green inhibitors for steel 44-2 in 0.1M HCl at various temperatures (30, 40, 50, and 60) °C using electrochemical technique. Five concentrations of inhibitor were added 4, 8, 12, and 16 ppm. Corrosion tests were performed by Potentiostat at 5 mV.sec-1 scan rate and the data measured by Tafel extrapolation method such as Tafel slopes, corrosion current density and corrosion potential. Inhibition efficiencies were calculated and indicated that 8 ppm was the best concentration for inhibition especially at 60oC, where was 96.47%. Pomegranate Shells behaves as anodic inhibitor type and obeys Langmuir adsorption isotherm. The equilibrium constant of the adsorption-desorption process and the apparent free energy of adsorption confirm the physicsorption of Pomegranate shells. FTIR spectroscopy was used to test film formed on steel surface compared with FTIR spectrum of Pomegranate Shells. These spectra confirm the formation of Fe2+Pomegranate shells complex.


Article
Design of Nano-Inhibitor of Dichlorobenzene and It's Adduct and Study of Its Structural and Electronic Properties: DFT Calculations

Authors: A.D. Thamir --- A.S. Hasan --- A.L. Abed --- F.Q. Mohammed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 8 Part (A) Engineering Pages: 795-800
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Corrosion in oil pipelines is one of the biggest problems in the oil sector companies because of the high cost resulted from repairing the corroded parts, or replace it with another non-corroded ones, so, in this research, we study the design of nano-inhibitor and study of its structural and electronic properties of dichlorobenzene molecule (C6H4Cl2) and the effect of adding groups of Hydroxy on those properties, density functional theory (DFT) at B3LYP level with (6-31G) basis sets. The study included four new molecules, which are including monohydroxy dichlorobenzene molecule, dihydroxy dichlorobenzene, trihydroxy dichlorobenzene, and tetrhydroxy dichlorobenzene. The structural and electronic calculations have been done by using Gaussian 09 program and Gaussian View in DFT calculations. The geometry optimization using both methods for dichlorobenzene (nano-inhibitor) and group’s Hydroxy molecules has been found in good agreement with experimental data. While the electronic properties included calculate total energy, ionization potential, electron affinity, chemical potential, electronegativity, electrochemical hardness and electronic softness for molecules under study. These results show that the energy gap reduced with the increase of the number of groups; also, the electron affinity and electronegativity for dichlorobenzene molecule Ben-Cl-2OH are the lowest, while the chemical potential be the highest for the same inhibitor. Nano-inhibitor result reduces corrosion of internal surfaces of tubes that used for transporting oil and gas to the importance of these molecules in terms of their high ability for interaction. Those dichlorobenzene can restrain corrosion from claiming steel toward framing an inactive layer for this molecule on the metal's surface.


Article
THE EFFECT OF INHIBITION ON CORROSION RESISTANCE OF AISI 1020 IN SEA WATER
تأثير المثبطات على مقاومة التآكل للفولاذ(AISI 1020) في ماء البحر

Authors: Huda Mohammed Abdulaziz --- Musaab Kadem Rashed --- Khalid Mahdi Thegel
Journal: AL-TAQANI مجلة التقني ISSN: 1818653X Year: 2013 Volume: 26 Issue: 5 Pages: E203-E210
Publisher: Foundation of technical education هيئة التعليم التقني

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Abstract

This paper aims to study the effect of inhibitor addition to sea water on corrosion ratesof St 1020 according to AISI . Many corrosion specimens were papered from the metalof dimensions of (15*15*3) mm according to ASTM G71-31 then Optical microscopywas used to observe the microstructureCorrosion tests were investigated by electrochemical potential state cell in 3.5% NaClsalt water (sea water) where the test specimen represents the positive electrode (anode)pole while tungsten electrode represents the cathode, the voltage was determined byopen circuit and compared with the positional of metal in the electrochemical series thenvoltage was increased ±100 mv, at each 10mv. then record the current causes the changeof voltage which will called the corrosion current then calculating corrosion rate byusing Tafel equation.The inhibitors Sodium Nitrate (NaNo2) and Sodium molybdate in the concentration of5% in addition to a synergistic inhibition of the both inhibitors in equal percentage of2.5% for each one were added to the prepared sea water to show the effect of theseinhibitors on corrosion behavior, and then corrosion rate calculated using Tafleequation.Results show that all the used inhibitors have contributed to reduce the corrosion ratewhile using the synergistic (blend) inhibitors gives the best results; this is due to thesynergistic action of these inhibitors in reducing the anodic and catholic activities thuspromoting a continuous and protective film on the alloy from corrosion.

يهدف البحث الى دراسة تأثير اضافة المثبطات على مقاومة التآكل لفولاذ كاربوني (1020 AISI) في ماء البحر, اذ تم تحضير عينات اختبار التاكل بابعاد 15*15*3 ملم وفق المواصفة القياسية ASTM G71-31 اتبعتها عمليات تحضير من تنعيم وصقل لاجراء فحص البنية المجهرية باستخدام المجهر الضوئي ذو كاميرا . تم اضافة المثبطات بنسبة تركيز 5% ( نتريت الصوديوم, ،مولبيد الصوديوم, ونتريت الصوديوم ومولبيد الصوديوم معا الى ماء البحر ثم اجراء اختبار التاكل الكهروكيميائي باستخدام جهاز المجهاد الساكن اذ تم امرار تيار كهربائي في خلية تتألف من قطبين احداهما قطعة العمل والثاني قطب من التنكستن عند جهد حدد من دائرة مفتوحة حسب موقع المعدن في السلسلة الكهروكيميائية ، وبعدها تم زيادة الجهد ب ( ±100 ) ملي فولت عند كل 10 ملي فولت ، وأن التيار الذي يؤدي الى تغير في الجهد يمثل تيار التآكل ، وتم حساب تيار التآكل اعتمادا على معادلة تافل . تم اضافة المثبطات بنسبة تركيز 5% لكل من نتريت الصوديوم, ،مولبيد الصوديوم,وكذلك اضافة نسب تراكيز 2.5% من نتريت الصوديوم و 2.5%مولبيد الصوديوم للحصول على تركيز 5% منهما معا ) ووجد ان جميع المثبطات ساهمت في تقليل معدل التآكل وان استخدام مثبطين معا اعطى افضل النتائج اذ عمل على تقليل معدل التآكل للمعدن بنسبة 20% مقارنة للوسط بدون مثبط.,لأن استخدام المثبطات المتزامنة قلل من التفاعلات عند قطبي الكاثود والانود وبهذا تكونت طبقة حماية مستمرة فوق المعدن لحمايته من التآكل


Article
Green Corrosion Inhibitor for Protection of Mild Steel

Author: S.A. Ajeel
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 9 Part (A) Engineering Pages: 914-921
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In the present work, corrosion inhibition of Mild steel in 1M H2SO4 solution by Rosmarinus Officinalis Leaves extract was studied by weight loss and potentiostatic methods. Increasing acid concentration leads to an increase in the corrosion rate of the electrode. The variable conditions used in this investigation are (100 to 1000 ppm at 25oC. Rosmarinus Officinalis Leaves extract for Mild steel. It has been found that the concentrates as a compelling consumption inhibitor for gentle steel in acidic medium. The hindrance process is credited to the development of an adsorbed film of inhibitor on the metal surface, which secures the metal against corrosion. The inhibition efficiency was observed that increase with increasing inhibitor concentration up to maximum 92% for 1000 ppm at 25 oC. The results show that the corrosion rate without inhibitor is 5.6 mpy while with inhibitor be 0.43 mpy, that is mean the corrosion rate was improved more than 90%. The effects of immersion time (2 h) at 25oC on the inhibition of corrosion have also been improved corrosion resistance. The results obtained show that Rosmarinus Officinalis Leaves Extract could serve as an excellent friendly green corrosion inhibitor. FTIR results indicate that this herb containing different chemical bonds (C-C, CH2, C-O-C, Cellulose) with steel surface producing barrier layer to protect the surface


Article
EVALUATION OF INHIBITOR EFFICIENCY IN CRUDE OIL PIPELINE OF MISSAN OIL FIELDS SOUTH IRAQ

Authors: Raed Abd Al-Hussain --- Haider Hadi Jasim
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 1 Pages: 145-161
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this paper, three different types of pipeline materials and four types of corrosion inhibitors were test using immersion method in the crude oil solutions collected from six fields southern Iraq. The influence of crude oil composition; temperatures and pipeline roughness were performed. As a result the X80 carbon steel has lower corrosion rate, while ductile iron has largest value and X60 steel shows moderate value. Imidazonline inhibitor has best efficiency while Great inhibitor shows lower efficiency, the pipeline and oil-line inhibitor show moderate values. Increasing roughness of pipeline material reduced inhibitor adsorption and lead to increase of corrosion rate


Article
Studying the effect of Metformin and Enzyme inhibitor drags on the level of aromatase Enzyme in the women have hormone disorder the Kirkuk city
دراسة تأثير عقارMetformin و مثبط الإنزيم على مستويات إنزيم Aromatase Enzyme في النساء المصابات باضطرابات هرمونية في مدينة كركوك.

Author: Saria Naji Muhsin ساريا ناجي محسن
Journal: Univesity of Thi-Qar Journal مجلة جامعة ذي قار العلمية ISSN: 66291818 Year: 2019 Volume: 14 Issue: 1 Pages: 62-71
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

This study included ( 100 ) samples of women used drugs Metformin, enzyme inhibitor in (Azadi General Hospital) (20) blood samples aspirated from healthy women as control sample. The samples were divided into three groups; the first group (40) women used Metformin (have primary infertilits), the second group (40) women used Letrazole (have Secondary infertilits). The third group was the healthy women(control). The results of the study indicated a significant decrease (p<0.05) in the Activity of Aromatase level in Primary infertile women age groups (18-25), (26-35) and (36-45). the results of this study reveal that three is significant decrease in the Activity of Aromatase (p<0.05) in women who have Secondary infertility with age groups (18-25), (26-35) and (36-45). This Drugs causes decreasing the level of the Estrogen by inhibiting the Aromatase Enzyme . The Drugs also called as (Enzyme inhibitor) because they inhibit Aromatase enzyme, This proves that the Letrazole Drugs has an effective role in stimulating ovulation in women who have primary and secondary infertility

شملت هذه الدراسة (100) عينة من النساء يستخدمن عقاري Metformin ومثبط الإنزيم في (مستشفى أزادي العام) في مدينة كركوك.(20) عينة دم سحبت من نساء غير مصابات كعينة ضابطة.العينات قسمت إلى ثلاثة مجاميع’المجموعة الأولى(40)من نساء يستخدمن عقار Metformin (مصابات بالعقم الأولي),المجموعة الثانية:(40)من نساء يستخدمن عقار مثبط الإنزيم(مصابات بالعقم الثانوي), والمجموعة الثالثة (20) من نساء غير مصابات كعينة( ضابطة) .لقد بينت نتائج البحث بوجود انخفاض معنوي في مستوى فعالية إنزيم الارومتيزعند مستوى(p<0.05) في مجموعة النساء المصابات بالعقم الأولي للفئات العمرية (18-25), (36-45)’ (26-35). و أظهرت نتائج البحث أيضا انخفاضاً معنوياً p <0.05) ) في مستويات فعالية إنزيم الأرومتايز في مجموعة النساء المصابات بالعقم الثانوي للفئات العمرية (18-25), (36-45)’ (26-35). هذا العقار يسبب انخفاض عالي في معدلات الاستروجين بواسطة تثبيط فعالية إنزيم الأرومتايز,وكذالك يدعى هذا العقار (Enzyme inhibitor) لأنه يثبط إنزيم الأرومتايز .وهذا يبرهن إن عقار Letrazole له دور فعال في تحفيز الاباضة في النساء المصابات بالعقم الأولي والنساء المصابات بالعقم الثانوي .

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