research centers


Search results: Found 676

Listing 1 - 10 of 676 << page
of 68
>>
Sort by

Article
Evaluation of Addition of Plant Fixed Oil Extracts (Ginger , Maramia, Eucalyptus) on Some Properties of Heat Cured Denture Base Material

Author: Luma M. Al-Nema
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 1 Pages: 132-138
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

The aim of this study was to evaluate the effect of three types of natural medicinal plants oils on the transverse strength, residual monomer and hardness of polymethylmethacrylate. Materials and methods: Total number of samples of (105) have been prepared in this study. Fifteen samples of heat cured ProBase acrylic resin were prepared without additives ( Control), and (90) samples were pre-pared with additives ( Ginger oil ,Meramia and Eucalyptus oil) in two concentrations (1.5 and 2.5) to evaluate transverse strength, indentation hardness and residual monomer. Results: The results showed a significant difference between control and addition groups in the transverse strength and hardness tests. The addition of oils decreased the transverse strength ,and increased the hardness.There was no significant difference between the residual monomer for control and addition groups, but the control group at the first day showed higher residual monomer release. Conclusion: The addition of eucalyptus , meramia and ginger oils to acrylic resin decreased the transverse strength , increased its hardness and showed no significant difference in residual monomer.


Article
Quality Improvement of Spent Lubricating Oil

Loading...
Loading...
Abstract

The acidity of spent lubricant was treated using sodium hydroxide solution. The effect of three variables on the treatment have been studied. These are mixing time ranging from 5-35 minutes, NaOH to lubricant weight ratio ranging from 0.25-1.25 and weight percentage of NaoH ranging from 2.6%.The experimental design of Box-Wilson method is adopted to find a useful relationship between the three controllable variables and the lowering in the acidity of the spent lubricant. Then the effective variables and interactions are identified using the statistical analysis(F-test) of three variable fractional design. The mathematical model is well represented by a second order polynomial.By the analisys of the experimental results, the best treatment conditions which achieved an acceptable acidity of the spent lubricant are 20 minutes mixing time, I weight ratio of NaOH to spent lubricant and 4.5 weight percentage of NaOH. At these condition the acidity of the lubricant decreases from 0.62 to 0.0602mg KOH/g oil.

Keywords

lubricating oil.


Article
New Viscosity correlation for different Iraqi Oil Fields

Author: Rwaida Kaiser Abdulmajeed رويدة قيصر
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2014 Volume: 15 Issue: 3 Pages: 71-76
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

Viscosity is one of the most important governing parameters of the fluid flow, either in the porous media or in pipelines. So it is important to use an accurate method to calculate the oil viscosity at various operating conditions. In the literature, several empirical correlations have been proposed for predicting crude oil viscosity. However these correlations are limited to predict the oil viscosity at specified conditions. In present work, an extensive experimental data of oil viscosities collected from different samples of Iraqi oil reservoirs was applied to develop a new correlation to calculate the oil viscosity at various operating conditions either for dead, saturated or under saturated reservoir. Validity and accuracy of the new correlation has been confirmed by comparing the obtained results of this correlation and other ones, with experimental data for Iraqi oil samples. It was observed that the new correlation gives the most accurate agreement with the experimental data.


Article
Tourism Planning as an Instrument to Develop the Archeology and religious tourism in Samarra
التخطيط السياحي كأداة لتنمية السياحة الأثرية والدينية في مدينة سامراء

Loading...
Loading...
Abstract

The current research aims to highlight the economic and social importance of tourism. The research also aims to case study the tourism sector in Samarra, highlighting the rectifiers of tourism in the city, and identify the challenges that banned this tourism sector from grew and development.The study discussed the practical use of tourism planning and possibility of using tourism planning by local government, scientific institutions and businessmen in Samarra in order develop the tourism sector.The study comes up with several results, such as the city of Samarra possesses several tourism rectifiers which help the city to build successful tourism sector, these rectifiers are holy religious graves, archeological locations, historical centers geographic and nature that increase the opportunity to build spring and summer tourism beside Tigris river and the lake of Samarra’s dam.The research observed many challenges facing the tourism sector in the city, among these challenges the first was the impairment of tourism infrastructure, the absence of tourism service from city such as housing, feeding, transporting, in addition the research show that the security situation had effected the tourism beside other factors such as the absence of tourism planning and the weakness of media and marketing services.The research proposes some recommendations among which is the suggestion to use the tourism planning as an instrument to develop tourism sector in the city, the research designed a plan to develop the tourism in the city and suggested the parties that should involve in designing and implementing this plan and finally drew the aims of the plan and the successful means to execute it.

يهدف بحثنا هذا إلى تسليط الضوء على الأهمية الاقتصادية والاجتماعية لقطاع السياحة، بالإضافة إلى دراسة واقع القطاع السياحي في مدينة سامراء، وتسليط الضوء على مقومات القطاع السياحي في المدينة، وتشخيص أهم المعوقات التي حالت دون نمو وتطور هذا القطاع. تطرقت البحث إلى الاستخدام العملي لعملية التخطيط، وامكانية استخدام التخطيط السياحي من قبل الحكومة المحلية والمؤسسات العلمية والبحثية ورجال الأعمال في سبيل تنمية القطاع السياحي. توصل البحث إلى مجموعة من الاستنتاجات كان من أهمها تمتع مدينة سامراء بالعديد من المقومات السياحية التي تساعد على بناء قطاع سياحي واعد، ومن هذه المقومات المراقد الدينية المقدسة، المراكز الاثرية والتاريخية اضافة إلى المقومات الطبيعية المتمثلة بالموقع الجغرافي المتميز وما تتمتع به المدينة من مناخ وتضاريس تساعد على قيام السياحة الصيفية والربيعية على ضفاف نهر دجلة وبحيرة سد سامراء. وقد رصد بحثنا عدد من المعوقات التي يواجهها القطاع السياحي في المدينة، جاء في مقدمتها تدهور البنى التحتية للقطاع السياحي الأمر الذي ادى إلى غياب الخدمات السياحية الاساسية عن المدينة من ايواء واطعام ونقل وترفيه، اضافة إلى التحديات الامنية التي واجهتها المدينة بسبب العمليات الارهابية، وغياب دور التخطيط لتنمية السياحة، اضافة ضعف دور الترويج والاعلام السياحي، وقد أوصى بحثنا بضرورة استخدام عملية التخطيط لتنمية السياحة ووضعت دراستنا مقترح للجهات التي يفترض اشتراكها في وضع خطة مقترحة لتنمية السياحة في المدينة، ورسمت اهدافها والاليات الكفيلة بتنفيذها.

Keywords

Oil Prices --- OPEC --- Oil Shocks


Article
New method to separate water from power transformer oils
طريقة جديدة لفصل الماء من الزيت العازل في محولات القدرة

Author: Munder.A.H.Khudhair منذر عبد الحسين خضير
Journal: Journal of Misan Researches مجلة ابحاث ميسان ISSN: 66221815 Year: 2011 Volume: 8 Issue: 15 Pages: 59-71
Publisher: Misan University جامعة ميسان

Loading...
Loading...
Abstract

: In the context of this paper , Insulating oil is drawn into the new water trap system, connect with oil purifier equipment and passed through an inlet strainer in the vacuum and created by the system’s vacuum pump, Before entering into the Processing/Vacuum Chamber, where water and contained in the oil are thoroughly exposed to vacuum by efficient dispersion and removed through a Vacuum Pumping Oil Purifiers use 5 micron cartridges inside the Vacuum Chamber. The transformer used in this work is high voltage transformer type ASIA , capacity is 63 MVA , quantity of oil is 19.5 ton temperature profile of oil is started at 21C° to 70 C° in time 168 h and we calculate quantity of water in hot oil transformer and break down oil , after oil purification we calculate insulation resistance for 132 kv side and compare theis results with Mitsubishi electric corporation standard.

في هذه الدراسة تم التركيز على عملية فصل الماء عن الزيت العازل المستخدم في محولات القدرة الكهربائية وذلك عن طريق تطوير جهاز في المختبر مصمم خصيصا" لهذا الغرض يربط مع جهاز تنقية الزيت وتم دراسة التغير في درجة حرارة الزيت المقاربة للظروف التشغيلية للمحولات مع كمية الماء المستخلصة ومع تغير العازلية الكهربائية للزيت ودراسة تأثير ذلك على العازلية الكهربائية لملفات محولات القدرة عند تسليط ضغوط عالية ومقارنة هذا التاثير مع المواصفات العالمية المعتمدة في محطات القدرة الكهربائية .


Article
Study of some plant oils effect on Aspergillus flavus L. growth on corn
دراسة تاثير بعض الزيوت النباتية في نمو الفطر L. Aspergillus flavus على حبوب الذرة الصفراء Zea mays L.

Author: Hala A. Abdul-Hassan هالة عبد الجبار عبد الحسن
Journal: Journal of Basrah Researches (Sciences) مجلة ابحاث البصرة ( العلميات) ISSN: 18172695 Year: 2007 Volume: 33 Issue: 1B Pages: 55-61
Publisher: Basrah University جامعة البصرة

Loading...
Loading...
Abstract

The plant oils (Corn oil, Olive oil and Castor oil) have been used at concentrations (0, 2.5, 5, 7.5 and 10) ml/L to study their effects on inhibition growth of A. flavus. The results revealed that olive oil had higher inhibition than other oils at the concentrations (5 and 7.5) ml/L, thus the corn treated with olive oil reduced the infection by A. flavus. The percentage of infection during time (120 and 90) min were (4.1 and 7.4)% respectively. This study showed that the chemical composition of storage corn treated with olive oil and contaminated didn't affect, whereas the storage corn contaminated only affected.

استخدم كل من (زيت الذرة وزيت الزيتون وزيت الخروع) بتركيز (0 و 2.5 و 5 و 7.5 و 10) مل/لتر لدراسة تاثيرها في تثبيط نمو الفطر Aspergillus flavus على حبوب الذرة الصفراء. اوضحت الدراسة ان لزيت الزيتون تاثيرا تثبيطيا واضحا في النسب المئوية لتثبيط النمو الشعاعي والنمو الجاف وتكوين الابواغ اذ بلغت نسب التثبيط (57.76 و 83.38 و 79.76)% على التوالي، وبينت نتائج التجارب ان افضل تركيزين كانا (5 و 7.5) مل/لتر ولم يكن لزيت الذرة وزيت الخروع تاثير واضح في الصفات الفسلجية لنمو الفطر. كما بينت نتائج تجربة تاثير معاملة حبوب الذرة الصفراء بزيت الزيتون بنسبة تلوثها بالفطر A. flavus تاثير المدة الزمنية في تقليل نسبة التلوث بالفطر اذ كانت اقل نسبة تلوث في المدة الزمنية (90 و 120) دقيقة فبلغت نسبة التلوث (7.4 و 4.1)%، كما اكدت نتائج التجربة الخزنية عدم وجود اي تاثيرات سلبية في المحتويات الكيميائية للحبوب المعاملة بزيت الزيتون وتاثر تلك المحتويات سلبا في الحبوب الملوثة بالفطر A. flavus.


Article
Evaluation of some physical properties of prepared molding wax in comparison to commercial available wax

Authors: Ibtehal H. Hassan --- Nadia T. Jaffer --- Mohammed M. Sadoon
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 2 Pages: 228-235
Publisher: Mosul University جامعة الموصل

Loading...
Loading...
Abstract

Aims: to evaluate the some physical properties (melting range, hardness and thermal expansion) of two prepared mixtures wax contain paraffin oil in comparison with commercial type wax. Materials and Methods: Two mixtures of experimental modeling wax were prepared, mixture No.1 (M1) and mixture No.2 (M2). These two mixtures underwent three physical tests in compare to commercial modeling wax which is a control group, these tests are: 1- Melting range test, 5 capillary tubes were sealed and filled with all type of wax and placed inside electro thermal melting point apparatus.The start of melting wax considered the beginning melting point and when the wax completely became fluid, it is considered the ending melting point. 2 Needle penetration test (hardness test), 5 cylindrical shape samples for each type of wax were prepared and tested for hardness by standard vicate apparatus. 3- Linear thermal expansion, for each type of wax, 5 samples were prepared in a mold , the samples were heated to 25 C° and 40 C° and the distance between reference marks at the lower temperature and the change in length on heating to higher temperature is determined by electronic digital caliper and thermal expansion is calculated as percentage of the total length of sample. Results: Statistical analysis of melting range test showed a significant difference between tested groups in both minimum and maximum melting point. M1 had the higher mean in minimum and maximum melting point. Hardness test analysis showed a significant difference between tested groups, higher mean of hardness was observed in M2, M1 and control group respectively. ANOVA of linear thermal expansion showed a significant difference between groups at 25 C° and at 40 C°. The control group of wax observed the highest mean of thermal expansion at 25 C° and 40 C° than the other two types of wax.Conclusion: The modification of dental wax improved some of the physical properties than commercial one.

Keywords

mineral oil --- wax --- beeswax --- paraffin oil.


Article
Study the Effect of Corrosion on the Pipes of Oil Well Production

Authors: Dr. Ramzy. S. Hamied --- Dr. Mohammad. A. Alhassan --- Dr. Mayssaa. A. AL-Bidry
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2018 Issue: 19 Pages: E155-E164
Publisher: Ministry of Oil وزارة النفط

Loading...
Loading...
Abstract

Corrosion costs of the oil industry are billions of dollars in a year. Corrosion affects every aspect of exploration and production of oil, from offshore rigs to casing and transporting the crude oil to refinery or exporting terminal. This study aims to investigate the effect of sulfur content on the corrosion of carbon steel and composite material (polyester/fiberglass) pipes used in well production. . In the present work three specimens of pipes from (Al – Nasiriyah oil field, Al – Daura refinery, and composite material) are prepared in the center of the training and workshop in university of technology with (3, and 5 mm) thickness and (30 mm) diameter which immersed in different types of Iraqi crude oil field (East – Baghdad, Al – Nasiriyah, and Al – Rumaila field) in different times (0, 14, 28, 42, and 56 day). Physical properties (viscosity, density, API grade, specific gravity (sp.gr), sulfur %, sediment %, and water %) of three types of Iraqi crude oil are tested in lab of petroleum technology department. Also study specimens of pipes by microscope to knowing the effect of sulfur % on these specimens. . The results showed that when increasing duration of immersed pipes and sulfur content in crude oil increased the rate of corrosion, and the composite material pipe gives the best result compared with the other two specimens pipes used because they didn’t influenced by corrosion when immersed in Iraqi crude oil. Also, it was noted that the diffusion coefficient decreased in composite pipe compared with the other pipes.


Article
Legislative requirement stability and its role in the arbitration in oil contracts
شرط الثبات التشريعي ودوره في التحكيم في عقود البترول

Author: gassan abaed غسان عبيد
Journal: Risalat al-huquq Journal مجلة رسالة الحقوق ISSN: 20752032 Year: 2009 Issue: 2 Pages: 170-185
Publisher: Kerbala University جامعة كربلاء

Loading...
Loading...
Abstract

Abstract Oil contracts are considered as the most important contracts which raise a wide range of argument and discussions among the legal, jurisprudence and economic circles equally. This argument was raised by a number of bodies , perhaps the position of these contracts ,which is oil ,makes them a vital economic weapon , and utmost contracts in the field, that have been used in the mid of the ninetieth century up to now.The great importance of this commodity has led to the variation and diversity of terms included within these contracts, such as the Legislation Constancy Condition, which is considered as the most arguable issue, occupying a vast area of discussions and argument within the jurisprudence circles over its different perspectives. First issue: Defines Legislation Constancy Condition.Second issue: Identifies its types.Third issue: jurisprudence attitude on the validity of the Legislation Constancy Condition, legal nature and consequent results. This is achieved by two requirements: first, the stand of the jurisprudence from the Legislation Constancy Condition; the second, its legal nature and consequent results. In the third issue we dealt with the function of Legislation Constancy Condition in the arbitration decisions of oil contracts and we discussed the most important arbitration decisions in oil contracts that have included the Legislation Constancy Condition by four questions:-1-Texaco arbitration decision of 1977.2-Liamco arbitration decision of 1977.3-Agip arbitration decision of 1979.4-Aminoil arbitration decision of 1982.Through this issue, we have reached a number of results and recommendations, which we have pointed in their place.

الخلاصة : تعد العقود البترولية من أهم العقود التي اثارت جدلاً واسعاً في الاوساط الفقهية القانونية والاقتصادية على حد سواء وان هذا الجدل تأتى من عدة جهات لعل أبرزها هومحل هذه العقود وهو البترول الذي يعد سلعة اقتصادية اكتشفت على نحو اقتصادي منذ نهاية القرن التاسع عشر ولحد الان .كما إن أهمية هذه السلعة قادت الى تنوع وتعدد الشروط التي تتضمنها هذه العقود لعل من ابرزها واكثرها جدلاً هو شرط الثبات التشريعي الذي اخذ حيزاً واسعا ًمن الجدل والنقاش في الوسط الفقهي على اختلاف اتجاهاته ، لقد تناولنا هذا الشرط في البحث الموسوم بـ(شرط الثبات التشريعي ودوره في التحكيم في عقود البترول ) ذلك بثلاثة مباحث ، الأول منها لتعريف شرط الثبات التشريعي وانواعه ذلك بمطلبين الاول منهما لتعريف شرط الثبات التشريعي والثاني لتحديد انواعه ، اما المبحث الثاني فقد تناولنا فيه موقف الفقه من صحة شرط الثبات التشريعي وتكييفه القانوني والنتائج المترتبة عليه في مطالب ثلاثة الاول منها لموقف الفقه والثاني لتكييفه القانوني ومايترتب عليه من نتائج ، اما المبحث الثالث فقد تناولنا فيه دور شرط الثبات التشريعي في احكام تحكيم عقود البترول وتطرقنا من خلاله الى اشهراحكام التحكيم في العقودمحل البحث التي تضمنت شرطاً للثبات التشريعي ذلك بأربعة مطالب،الاول منها حكم تحكيم تكساكوTexacoلسنة 1977 والثاني حكم ليامكوLiamco لسنة 1977والثالث حكم تحكيمAgip لسنة 1979والرابع والاخير حكم تحكيم امينوئيل Aminoilوتوصلنا من خلال البحث الى جملة من النتائج والتوصياتا اشرنا اليها في محلها.


Article
Regeneration of Spent Transformer Oil

Authors: Mohammed Abbas Kadhum --- Abdul-Halim Adbul-Karim Mohammed
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2010 Volume: 16 Issue: 4 Pages: 5799 -5810
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

The regeneration of spent transformer oil taken from Al-Dora power station was studied. The regeneration process includes settling, filtration, thermo vacuum evaporation, and clay treatment. The settling was done by gravity to remove the mechanical particles. The filtration was done by filter paper [whatman quality1 and 18.5 cm diameter]. Thermo vacuum evaporation at 175˚C and 241 mm Hg was used for removing the dissolved water and light petroleum impurities. The clay treatment was used for final improvement of transformer oil properties. Iraqi clay, Algerian clay and zeolite (A) were used and the results were compared. It was studied the effect of clay to oil ratio and the mixing time on the water content, break down voltage and the acidity. It was considered that the best operation conditions are clay to oil ratio 2/100, and time 5 min. In these conditions the oil has water content 32 ppm, break down voltage 55 kV and acidity 0.028 mg KOH/g oil. It was found that Algerian clay gives better improvement than zeolite and Iraqi clay using the same operating conditions. Langmuir, Freundlich, and the combination of them adsorption isotherms were studied in this investigation and It was found that Freundlich adsorption isotherm well represented the adsorption of water on clay comparing with others isotherms.

تم دراسة عملية إعادة استخدام زيت المحولات المستهلك والذي تم أخذه من محطة كهرباء الدورة. إن عملية إعادة الاستخدام تتضمن ترسيب, تصفية, تبخير بواسطة الحرارة والفراغ, ومعاملة بواسطة الأطيان. تم الترسيب بواسطة الجاذبية الأرضية لإزالة العوالق الميكانيكية. عملية التصفية بواسطة ورق تصفية (واتمان نوعية 1, قطر 18.5سم ) استخدمت لإزالة الشوائب التي لا يمكن إزالتها بالترسيب. التبخير الحراري الفراغي في 175˚م و 241 مليمتر زئبق استخدمت لإزالة الماء الذائب و الملوثات النفطية الخفيفة المسببة زيادة الحامضية وقلة العزل للزيت. المعالجة الطينية إستعملتْ للتحسينِ النهائيِ لخواص زيت المحوّلاتِ.الطين العراقي, الطين الجزائري, والزيولايت نوع (أ) استخدموا للمعاملة النهائية وتم مقارنة النتائج. تم دراسة تاثير نسبة الطين الى الزيت ووقت المزج على خواص المحتوى المائي والعازلية والحامضية. قَدْ يَعتبرُ إن أفضل شروطِ العمليةِ إن نسبة الطين إلى الزيت هي 2100، وبُوقّت 5 دقيقة. في هذه الشروط يكون للزيت محتوى مائي 32 جزء بالمليون ، والعازلية 55 ك ف, وحموضة 0.028 ملغم KOH غم زيت. لقد وجد ان الطين الجزائري افضل من الزيولايت والطين العراقي باستخدام نفس الظروف التشغيلية. صيغ الامتزاز لونكماير, فريندلج, وصيغة اتحادهما قد دُرِسَت في هذا البحث وقد وجد ان صيغة فريندلج للامتزاز تصف عملية امتزاز الماء على الطين أفضل من الصيغ الأخرى.

Listing 1 - 10 of 676 << page
of 68
>>
Sort by
Narrow your search

Resource type

article (674)

journal (2)


Language

English (369)

Arabic (184)

Arabic and English (108)


Year
From To Submit

2019 (61)

2018 (86)

2017 (89)

2016 (91)

2015 (64)

More...