البحث — المستودع الرقمي العراقي

نتائج البحث: 25 من أصل 7,092

دور البنك المركزي في تحقيق الاستقرار النقدي في العراق للمدة (2003 - 2015) == The role of the central Bank in achieving monetary stability in Iraq for the period (2003 - 2015)

اسم المؤلف: جمانة علي باقر

اسم المشرف: خالد حسين علي المرزوك

الموضوع العام: الادارة والاقتصاد

السنة: 2017

الموضوع الدقيق: العلوم المالية

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الادارة والاقتصاد

اللغة: العربية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: يهدف البحث الى بيان النجاح اوالاخفاق في اداء البنك المركزي العراقي بعد 2003 عن طريق استخدامه لوسائل وادوات السياسة النقدية الحديثة كمزاد العملة والتسهيلات القائمة ومزاد الحوالات والسندات لما لها من دور كبير في تحقيق الاستقرار النقدي ،وتحديد العوائق التي تقف في طريق تحقيق اهدافه واستخدام النموذج القياسي في تحليل اثر مؤشرات السياسة النقدية والمتمثلة بعرض النقد وسعر الفائدة وسعر الصرف في معدل نمو الناتج المحلي الاجمالي ومعدل التضخم .من اجل الوصول الى هدف البحث فقد تم تقسيمه الى ثلاثة فصول تناول الاول منها البنك المركزي والسياسة النقدية والاستقرار النقدي اما الفصل الثاني فجاء تحت عنوان البنك المركزي العراقي وتطور السياسة النقدية اما الفصل الثالث فتناول قياس اثر ادوات البنك المركزي في تحقيق الاستقرار النقدي في الاقتصاد العراقي (1990 - 2015) واعتمد البحث على فرضية مفادها ان السياسة النقدية التي يقوم بها البنك المركزي العراقي كانت كفيلة بتحقيق حالة الاستقرار النقدي اثناء المدة المدروسة في البحث ، وقد توصل البحث الى استنتاجات اهمها استخدام البنك المركزي لادوات حديثة بالاضافة الى الادوات النقدية التقليدية ساهمت بشكل كبير في تحقيق الاهداف ويتبين من النتائج القياسية ان مؤشرات السياسة النقدية المستخدمة في النموذج القياسي ولكلا المعادلتين لها تاثير كبير في المتغيرات التابعة عندما بلغ (R2) المتمثلة بمعامل التحديد 97% مما يعني ان المتغيرات المستقلة فسرت 97% من المتغيرات التابعة ، وكذلك يتضح ايضا من العلاقة بين المتغيرات المستقلة والمتغيرات التابعة المستخدمة في البحث انها لاتتفق جميعا مع منطق النظرية الاقتصادية يعود سبب ذلك للقرارات غير الصائبة المتخذة في اغلب المجالات ان لم يكن جميعهوااعتماد الناتج المحلي الاجمالي على مصدر يكاد يكون الاوحد للايرادات المتمثل بالقطاع النفطي كبلد ريعي .فالعلاقة بين مؤشرات السياسة النقدية المستخدمة في بحثنا كمتغيرات مستقلة ومعدل نمو الناتج المحلي الاجمالي كمتغير تابع في النموذج القياسي الاول او المعادلة الاولى فنجد ان سعر الصرف لايتفق مع طبيعة النظرية الاقتصادية جاءت هذه النتيجة بسبب التقلبات الحادة التي كان يشهدها سعر الصرف الاجنبي امام الدينار والتي تعمل على تباطؤ عملية النمو الاقتصادي ،كذلك الحال بالنسبة لعرض النقد فالاشارة السالبة تدل على علاقته العكسية مع معدل نمو الناتج المحلي الاجمالي وهذا لايتفق مع منطق النظرية الاقتصادية وان سبب ذلك يعود الى ضعف القطاعات الاقتصادية المنتجة عدا قطاع النفط الذي لايتاثر بعرض النقد وانما يؤثر فيه،اما العلاقة بين مؤشرات السياسة النقدية المستخدمة في بحثنا كمتغيرات مستقلة ومعدل التضخم كالمتغير تابع في النموذج القياسي الثاني نجد ان عرض النقد يرتبط بعلاقة عكسية مع معدل التضخم وهذه النتيجة مخالفة لمنطق النظرية الاقتصادية ، وذلك يعود الى طبيعة الاقتصاد العراقي وهيكل التجارة الخارجية فيه والمتمثلة بالحدود المفتوحة وسياسة الاغراق التي تمارسها العديد من دول العالم تجاه العراق، كذلك سعر الفائدة فالاشارة الموجبة تدل على العلاقة الطردية بينه وبين معدل التضخم وهذا مخالف لمنطق النظرية الاقتصادية الذي يشير الى وجود علاقة عكسية بينهم . وهذا التقلب في سعر الفائدة يبين ان البنك المركزي العراقي كان مقيدا بالقرارات التي تطلقها الحكومة هذا يجعل من سعر الفائدة يمارس تاثيرا طفيفا في السياسة النقدية للبلد .

تاثير لوجستك التوزيع في تحقيق رضا الزبون : دراسة تحليلية لاراء عينة من الزبائن والعاملين في شركة توزيع المنتجات النفطية - هياة توزيع الفرات الاوسط فرع بابل == The Impact of Logistics Distribution in achieving customer satisfaction Analytical Study in Oil Products Distribution State Company Babylon Branch

اسم المؤلف: حسنين حميد محسن الجباوي

اسم المشرف: مجبل رفيق مرجان

الموضوع العام: الادارة والاقتصاد

السنة: 2017

الموضوع الدقيق: ادارة صناعية

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الادارة والاقتصاد

اللغة: العربية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: تهدف هذه الدراسة الى تحديد تاثير لوجستك التوزيع في رضا الزبون ، ولتحقيق ذلك اعتمدت الدراسة لوجستك التوزيع بابعاده المتمثلة بـ ( النقل , المستودعات , ادارة المخزون , معالجة الطلبات ) ورضا الزبون بابعاده المتمثلة بـ ( الاعتمادية , الاستجابة , العناية , الثقة , الملموسية ) . وقد حاولت الدراسة الاجابة عن تساؤلات المشكلة ومن اهمها تحديد طبيعة العلاقة بين لوجستك التوزيع ورضا الزبون , مدى تاثير لوجستك التوزيع في رضا الزبون . وقد اجريت الدراسة في الشركة العامة لتوزيع المنتجات النفطية / هياة توزيع الفرات الاوسط / فرع بابل , وتم اعتماد الاستبانة للحصول على البيانات اللازمة وكذلك المقابلات الشخصية ، حيث تم تحليل اراء (63) من العاملين في الشركة الى جانب (90) من الزبائن المتعاملين معها . وقد تم استخدام معامل الارتباط البسيط لقياس علاقات الارتباط بين المتغيرات وكذلك اختبار (Z) لاختبار معنوية هذه العلاقة واختبار (T) لتحديد معنوية معادلة الانحدارالبسيط والمتعدد والتحليل العاملي التوكيدي . وقد سعت الدراسة الى تحقيق مجموعة من الاهداف اهمها تقييم مدى فهم المنظمة المبحوثة لـ ( لوجستك التوزيع ) ومدى تنفيذه وتحديد ابعاد لوجستك التوزيع ورضا الزبون . وقد توصلت الدراسة الى جملة من الاستنتاجات اهمها : 1 - شروع الشركة بالتعاقد مع شركات خاصة للنقل بدلا من الافادة من خطوط الانابيب المت | This study aimed to determine the effect of logistics distribution in customer satisfaction. To achieve this, the study depended on logistics distribution (transportation, warehousing, inventory management and processing orders) and customer satisfaction with its dimensions (reliability, responsiveness, Empathy, Assurance, Tangibility). The study tried to answer on the questions of the problem, the most important of which is to determine the nature of the relationship between logistics distribution and customer satisfaction, the extent of the impact of logistics distribution in customer satisfaction. The study was applied in the General Company for the distribution of petroleum products / Central Euphrates Distribution Authority / Babel Branch. The questionnaire was adopted to obtain the necessary data as well as the personal interviews. The opinions of (63) employees were analyzed in addition to (90) customers. The simple correlation coefficient was used to measure the correlation between the variables as well as the (Z) test for the significance of this relationship and the (T) test to determine the significance of the regression equation. The study has sought to achieve a set of objectives, The most important of which is to assess the extent of the organization's understanding of the logistics and the extent of its implementation, and to identify indicators of logistics distribution and customer satisfaction. The study reached a number of conclusions : 1 - Contracting with private transport companies instead of benefiting from the available and workable pipelines.2 - The size and number of warehouses does not fit with the city's need of oil products.

اثر تقلبات سعر الصرف في الاستخدام في الاقتصاد العراقي للمدة (1990ـ2015) == Effect of Exchange Rate fluctuations on Employment on The Iraqi Economy for the period (1990 - 2015

اسم المؤلف: دعاء عبد الامير عبد المهدي

اسم المشرف: عبد الخالق دبي الجبوري

الموضوع العام: الادارة والاقتصاد

السنة: 2017

الموضوع الدقيق: العلوم المالية والمصرفية

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الادارة والاقتصاد

اللغة: العربية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: الاقتصاد العراقي شانه شان اغلب اقتصادات البلدان النامية تعرض الى العديد من الاختلالات الاقتصادية وبشكل اكثر حدة منذ مطلع التسعينيات من القرن الماضي وحتى وقتنا الحاضر مما ادى الى فقدانه عوامل الاستقرار الاقتصادي، بفعل الحروب والعقوبات الاقتصادية التي تعرض لها البلد وضعف تعبئة الموارد المحلية، وتزايد الاعتماد على التمويل الخارجي . وتعد مشكلة التشغيل من اخطر المشاكل التي يواجهها الاقتصاد العراقي، وذلك لان طابع التشغيل السائد هو طابع لا انتاجي واثر هذا على عملية التنمية الحقيقية واعاقتها . ومما تقدم فان اول عمل يجب القيام به هو اصلاح نمط التشغيل السائد، وذلك لاتباع العراق نظام تشغيل يعتمد الاعالة والسبب عدم امتلاكه نظام لاعالة البطالة . ولحل هذه المشكلة فان الامر يتطلب التغيير في بيئة اعمال الاقتصاد العراقي والاعتماد على القطاع الخاص واعادة النظر بالقرارات الاقتصادية الخاطئة التي كان لها الدور المؤثر في اغلب التشوهات والازمات التي اصابت الاقتصاد ، ومن هنا تاتي اهمية البحث من الدور الذي يمكن ان يؤديه سعر الصرف في التاثير في الاستخدام من خلال مجموعة من المتغيرات منها (الصادرات ، الاستيرادات ، الايرادات ، النفقات ، ناتج القطاع الصناعي ، الناتج المحلي الاجمالي ، التضخم ) ، ويعد الاستخدام من اهم العوامل الانتاجية وان نتائج العملية الانتاجية تؤول الى اليد العاملة . واستنتج البحث ان دخول اعداد جديدة من العاملين الى سوق العمل بعد بلوغهم سن العمل او تخرجهم من الجامعات والمعاهد وعدم توفر فرص فرص العمل لهم ادى لزيادة معدلات البطالة ، ووجود علاقة قوية بين سعر الصرف والاستخدام من خلال مجموعة من المتغيرات حيث بلغ ال R - squared )0.987348( . واوصى البحث بضرورة دعم وتفعيل قطاعات الزراعة والطاقة والبناء والتشييد والسياحة والارتقاء بالبنى التحتية, لان تفعيل هذه القطاعات سيزيد من مستوى الاستخدام ، بالاضافة الى القيام بتنويع الاقتصاد وذلك من خلال الاستفادة من الايرادات النفطية والاعتماد على القطاعات الرئيسية كالزراعة والصناعة وهذا بدوره سيزيد من مساهمة هذه القطاعات وخاصة السلعية في اجمالي الصادرات , ومن ثم تقليل مخاطر الاعتماد على مادة اولية واحدة في التصدير والتي تخضع للتغيرات الخارجية والتي تحتاج الى ايدي عاملة بصورة اكبر مما يؤدي الى زيادة فرص العمل . | the Iraqi economy, like most of the economies of developing countries exposed to many economic imbalances and more sharply since the early nineties of the last century to the present time, which led to the loss of factors of economic stability, the wars and economic sanctions imposed on Iraq, as well as weak domestic resource mobilization, and increased reliance on external financing, and is a problem Alchg For the most serious problems facing the Iraqi economy, and because the prevailing operating , the nature of the character is not productive and that the real impact on the development process has been held up. The first work to be done is to reform the prevailing mode of operation, for Iraq to have a dependable operating system and a lack of an unemployment support system. To solve this problem, it requires a change in the environment of the Iraqi economy, relying on the private sector and correcting the wrong economic decisions that have had an influential role in most of the distortions and crises that have afflicted the economy. Hence the importance of research on the role that the exchange rate can play in influencing Employment through set of variables (Exports, imports, revenues, expenditures, output of the industrial sector, GDP, inflation), and the Employment of the most important productive factors and the results of the process of production turn to the labor force . Research concluded that the high unemployment in the Iraqi economy during a search, and enter new numbers of workers to the labor market after reaching the age of work or graduate from universities and institutes which did not provide them with jobs, and that increased the unemployment phenomenon ,and the value of R - squared (0.987348) this means there is a strong relationship between the exchange rate and employment. The research recommended the need to support and activate the sectors of agriculture, energy, construction, tourism and upgrading of infrastructure, because the activation of these sectors will increase the level of employment, in addition to the do the diversification of the economy through the use of oil revenue and rely on key sectors such as agriculture and industry which in turn will increase the contribution of these sectors, particularly in commodity exports, and thus reduce the risk of relying on a single raw material exports that are subject to external changes which need more hands, leading to an increase in employment

قياس اثر صدمة الايرادات النفطية في متغيرات السياسة النقدية في العراق للمدة 1999 - 2015 == The Measurement of The Impact Of The Shock Of Oil Revenues In The Variables Of Monetary Policy In Iraq For The Period (1999 - 2015)

اسم المؤلف: سيف علي عبد الرزاق شريف الخفاجي

اسم المشرف: حسين ديكان درويش الدليمي

الموضوع العام: الادارة والاقتصاد

السنة: 2017

الموضوع الدقيق: الاقتصاد

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الادارة والاقتصاد

اللغة: العربية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: e advantage of the Iraqi economy it's parish because it's dependence on the oil sector which is the main source of financing of the revenue side of the state budget by more than (82%) and constitutes more than (56%) of GDP in light of the decline in other economic sector's, and this dependency has imposed on the economy a feature of instability and volatility towards the crises in oil revenues associated directly oil prices which created a permanent deficit in the state budget and trade balance due to dependence on imports to cover domestic demand for goods and services, and this dependency has made the monetary power (Central Bank of Iraq), face difficulties in controlling monetary policy variables in a manner that ensures the achievement of it's final objectives of which the most important is economic stability and the preservation of the foreign exchange rate and reduce inflation rate due to the directly relationship between oil revenues and money supply through public expenditure which is increasing by increas oil revenues and this expenditure increase the growth rate of money supply more than the GDP growth rate thus raising the general price level(Raising inflation rates) especially in the context of a budget to cover current expenditure (consumption)on the base of reducing investment expenditures .Therefore, this study attached to impact measuring the effw of oscillations in the oil revenues on monetary policy variables . For the duration(1999 - 2015), Due to dependency on the hypothesis that oscillations (Shocks)The oil revenues in both (The positive and negative) contribute to monitoring the course and movement of macro - economic variables in Iraq between the state of stability and economic cycles .And to achieve this hypothesis the structure of the study was divided into three chapters the first one dealt with the theoretical framework of the oil economy and monetary economy and identify the mechanism of measuring Shock.The second dealt with the analysis of economic variables of the Iraqi economy .and the third dealt with economic measurement to the impact of the shock of oil revenues in the variables of monetary policy .The research results reflected the big role which exercised by oil revenue shocks in the Iraqi macroeconomy to the short run and long run .The study recommends the central Bank Iraq must use the monetary policy tools to adjust the growth rates of money supply compatible with GDP growth rates at the lowest cost to sustain the foreign currency reserves .

استقصاء قلف شجرة الكالبتوس كمانع تاكل للفولاذ الكربوني X52 في الاوساط المختلفة للانابيب الناقلة للنفط الخام == Investigation The Bark Of Eucalyptus Tree As Corrosion Inhibitor For Carbon Steel X52 In Different Media Of Crude Oil Pipelines

اسم المؤلف: زينب فؤاد حمزة الشريفي

اسم المشرف: كاظم فنطيل السلطاني

الموضوع العام: هندسة الانتاج والمعادن والمواد

السنة: 2017

الموضوع الدقيق: هندسة المعادن

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية هندسة المواد - قسم هندسة المعادن

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: In the oil and gas industry, the crude oil pipelines which made of low carbon steel suffer from internal corrosion. The corrosion operation is originally related with the presence of the wastewater mixed with the crude oil, especially when it is accompanied by hydrogen sulfide, carbon dioxide, elemental sulfur, inorganic salts, organic acids, and bacteria. Corrosion inhibitors injection in the oilfield is a most common and beneficial method for prevention the pipelines internal corrosion. Because of a high cost and toxic nature of the chemical corrosion inhibitors which used presently in oil industry, it is necessary to promote a less expensive and environmentally acceptable inhibitors, natural plants can be treated as a perfect sources for this purpose.This study investigate the internal corrosion of low carbon steel pipelines in fluid environments, as well as prepare and use natural and locally available plant ( the bark of eucalyptus tree) as a natural corrosion inhibitor, and compared the new inhibitor with a chemical inhibitor used by Missan Oil Company (MOC) in terms of the cost, toxicity, availability and performance.Some experiments were achieved to estimate the performance of a new inhibitor, one of these tests include corrosion measurement by simple immersion in crude oil within and without of inhibitors which added in different amounts 30, 40, 50, and 60 ppm , where the best inhibition efficiencies which get when added the inhibitors in a critical amounts or closest to it, since for the aqueous extract (EB - A) the inhibition efficiency reached (94.4) and (86.71)% at 300 and 323K respectively, and for diethyl ether extract (EB - D) reached (82.87) and (84.6)% at 300 and 323K respectively, while the chemical inhibitor (CRW) which used by MOC reach to (84.21) and (88.73)% at 300 and 323K respectively.optical microscopy examination have been conducted to evaluate the corrosion nature where it show a clear difference in the topography of the immersed samples surface after add the inhibitors at two temperatures.Another tests was achieved to evaluate the corrosion behavior such as potentiostatic polarization and open circuit potential tests in wastewater, since the inhibitor efficiency at 313k reached (88.21)% when add a 60ppm from the EB - A inhibitor to the wastewater in Tafel extrapolation, while it reached (74.91)% when add a 30ppm from the EB - D inhibitor.Several tests was achieved such as FT - IR spectra and using a chemical reagents to detection the presence of many active groups and the presence of tannins, phenols and alkaloids in the Eucalyptus Bark (EB).The results show , that the new corrosion inhibitor is not only equivalent to a chemical inhibitor, but have greatly improvement properties such as : high efficiency , low cost , non - toxic , easily to product, and nonpolluting as compared with chemical inhibitor which is considered toxic and cancering inhibitor.

استقصاء الخواص الفيزيائية والميكانيكية لنحاس الومينا متدرج وظيفيا == Investigation Of Physical And Mechanical Properties Of Cu/Al2O3 Functionally Graded Materials

اسم المؤلف: رؤى حاتم كاظم

اسم المشرف: عبد الرحمن كاظم عبد علي

الموضوع العام: هندسة الانتاج والمعادن والمواد

السنة: 2017

الموضوع الدقيق: هندسة المعادن

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية هندسة المواد - قسم هندسة المعادن

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: One of the most important smart material is the functionally graded materials, which had more increasing attention in different engineering applications.In this study, five - layered stepwise Cu/Al2O3 as functionally graded materials have been prepared from copper powder with five percentage of alumina powder as (5, 10, 20, 30, and 40 Wt%) by using powder metallurgy technique. Mixing of copper (34.32 ?m) and alumina (1.439 ?m) powders for two hours and then several disk sample with dimensions (14mm diameter and 10mm thickness) and cylindrical specimens with (18mm diameter and 27 height) have been compacting at different compacting stresses (550, 650 and 750 MPa). However, sintering of specimens for three hours at 850?C under vacuum about has been achieved.Several physical tests such as porosity, electrical resistance and thermal conductivity, X - ray diffraction, X - ray Fluorescence and Particale size analysis have been achieved. Furthermore, Microstructure and mechanical tests such as hardness, compression, double shear and dry sliding wear have been done for preparing samples from composite and functionally graded material.Numerical modeling using finite element analysis by ANSYS software has been presented for copper/alumina joints and compare with copper/alumina functionally graded materials.From the several experimental results, it is clear that the best compacting pressure was 650 MPa is determined by measuring green density at different compacting pressure, hardness increased with the increasing additive percentage of alumina, hardness resultschange in each layer by producing functionally graded materials (FGM) according to the percentage of the harder constituent (i.e. Al2O3) from 53 to 113 HV at compacting pressure 650 MPa, While the shear strength decreases with alumina increased from 72 MPa for layer one to 28 MPa for layer five at compacting pressure 650 MPa. The Wear rate increases as the time and load is increased. The wear resistance increased with increasing contain of Alumina. Results from the numerical modeling, it is clear that residual thermal stresses gradually decreased from the interface to the edges of functionally graded sample whereas in Copper/Alumina joint there is very high thermal residual stress in the joint interface.

التصميم الامثل لانواع الجدران الساندة تحت الاحمال الساكنة والزلزالية == Optimal Design of Types of Retaining Structures Under Static And Seismic Loads

اسم المؤلف: مهدي كريم عريبي

اسم المشرف: عبد الحسن خضير الشكري

الموضوع العام: الهندسة المدنية

السنة: 2014

الموضوع الدقيق: هندسة الموارد المائية

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة المدنية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

معالجة مياه الصرف الصناعي لمصافي النفط بالاكسدة الانودية المباشرة == Treatment Of Petroleum Refinery Wastewater By Direct Anodic Oxidation

اسم المؤلف: انغام سامي حمزة

اسم المشرف: علاء نور غانم الموسوي

الموضوع العام: الهندسة الكيمياوية

السنة: 2016

الموضوع الدقيق: الهندسة الكهروكيمياوية

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكيمياوية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: مياه الصرف الصناعي لمصافي النفط الناتجة بصورة رئيسية من عمليات تكرير النفط الخام والصناعات التحويلية، مواد التشحيم والبتروكيماويات الوسيطة. هذه السوائل هي المصدر الرئيسي للتلوث البيئي المائي. تتكون مياه الصرف الصناعي من الزيوت والشحوم والمركبات العضوية ا | Petroleum refinery wastewater originating from petroleum industries primarily resulted in refining crude oil and manufacturing fuels, lubricants and petrochemical intermediates. These effluents are a major source of aquatic environmental pollution. The wastewaters are composed of oil and grease, toxic organic compounds along with many other minerals. In this study, wastewater of Al - Najaf petroleum refinery was used as electrolyte solution in the experiments, and the effect of some variables on the removal of organic material as a pollutant in term of COD were studied. The performance of anodic oxidation represented by COD removal was studied using 1 liter batch - mode parallel plate electrochemical reactor at constant initial COD concentration and fixed agitation speed of 250 rpm with the variation of operating conditions that were expected to have a major effect on process. These variables were : electrodes material (platinum, stainless steel, graphite, PbO2, and carbon felt), current densities (5, 15, 25) mA cm - 2 for carbon felt electrode and (10, 30, 50) mAcm - 2 for other electrodes, pH (4, 7, 10), temperatures (25, 40, and 55)?C and with electrolysis time up to 120 minutes. The results show that the direct anodic oxidation process gave the best COD removal percent of 84.88% and 86.27% at 50 and 25 mA cm - 2 current densities for PbO2 and carbon felt anode materials, respectively. The highest COD removal was predicted at pH 4 and the best temperature at 55?C for all electrode types. The reaction was followed by pseudo first - order kinetics rate. As well, it was studied the effect of current density on the current efficiency, instantaneous current efficiency, energy consumption, charge load with the time and calculated activation energy.

تحسين الاداء الحراري للمائع النانوي في المبادلات الحرارية == Enhancement Of Thermal Performance Of Nanofluids In Heat Exchangers

اسم المؤلف: شهد فالح حسن

اسم المشرف: تحسين علي الحطاب

الموضوع العام: الهندسة الكيمياوية

السنة: 2017

الموضوع الدقيق: الهندسة الكهروكيمياوية

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكيمياوية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: التقنية الواعدة التي تستخدم لتعزيز عملية الانتقال الحراري هي باستخدام الموائع النانوية كخيار جيد واستبدالها محل السوائل التقليدية الشائعة. والمبادلات الحرارية هي معدات واسعة التطبيق في كثير من التطبيقات الصناعية المختلفة وبالتالي يكون سلوك وخصائص المائع | The most promising technique that is used to enhance the thermal performance for the heat transfer processes is using the nanofluids as a good choice to replace the conventional fluids. The heat exchangers are the wide range application equipment that is used for different industrial applications and therefore, the properties and the behavior of the fluid media are the main control parameters in equipment design of the heat exchangers. In this work an attempt was made to investigate experimentally the thermal performance of nanofluid which consists of deionized water (DI) as a base fluid and Aluminum oxide (Al2O3) as solid nanoparticles. The investigation includes two parts, the first one is studying the effect of addition of solid nanoparticles to the base fluid on the thermo - physical properties such as density, viscosity and thermal conductivity for different values of the volume fraction of nanoparticles. The second part includes the experimental work studying the effect of the nanoparticles (Al2O3) volume fraction (0.05, 0.1 with base fluid ), heat flux (With three values 7.4W,11W,16.8W) and angle (With two values 90?,45?) with four models (four different type from wicks in heat pipe) to enhance the heat transfer in heat pipe with two cases of transient temperature distribution and steady state. One model is different from the other by using different wicks in a heat pipe in all models. The general results referred to the enhancement of heat transfer rate are represented by increasing the concentration of nanoparticles (Al2O3) volume fraction such as (?=0.1) is better than (?=0, ?=0.05), increasing heat flux such as (16.8W) is better than (7.4W,11W) and an inclination angle such as( 45?) is better than (90?).At the transient state the time to reach to the steady state decreases when the concentration of the nanoparticles (Al2O3) volume fraction increases, the heat flux increases and the angle incline. In model 4 the heat transfer enhancement is better than that of model 3 and model 3 is better than that of model 2 and model 2 is better than that of model 1.The time to reach the steady state decreases in model 4 more than model 3, model 2 and model 1. The temperature decreases in the heat pipe when we gradually sidle from heater. The time to reach to steady state found in model 4 at concentration of nanofluid (?=0.1) and heat flux (16.8W) in angle (45?) is (19 min). In the steady state when we increase the concentration of the nanoparticles (Al2O3) volume fraction at the same distance (z) the temperature increases ,The increase in the heat flux of the hot part of the heat pipe will always increase the temperature in the heat pipe and the temperatures distribution in the heat pipe will be improved. The thermal performance of the heat pipe is enhanced by increasing the concentration of the nanofluid , the heat flux and by inclining the heat pipe from 90? angle to 45? angle such as in result of model 4.

تصميم تقسيم مساحة نظام الارسال الضوئي لنظم الاتصالات == Design And Implementation Of Optical Space Division Multiplexer For Tera (B/S) Communication Systems

اسم المؤلف: مصدق ماهر عبد الزهرة

اسم المشرف: ابراهيم عبد الله حمزة الشمري

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2017

الموضوع الدقيق: هندسة الالكترونيك والاتصالات

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: اتصالات الالياف البصرية هي العمود الفقري للبنية التحتية للاتصالات السلكية واللاسلكية التي تدعم شبكة الانترنت. النظام الاحادي الالياف المستخدم لنقل البينات لم يعد يلبي طلب الحصول على القدرة العالية والمتنامية بشكل مستمر. هناك العديد من الطرق الممكنة لزياد | Optical fiber communication system is considered as the backbone for the infrastructure of telecommunications that handles the internet. The exponentially growing capacity is no longer satisfied by using transmission of single mode fiber. There are several possible methods for increasing transmission capacity over fixed bandwidth. These include mix many signals with optical - carrier onto a one optical fiber by achieving various wavelengths, modulation employing different amplitude levels, and two orthogonal subcarriers and polarization. An extra dimension that a fiber can offer for achieving more information is space.This project demonstrates simulation systems for Space Division Multiplexing (SDM) transmission system using Few - Mode Fiber (FMF). Polarization division multiplexing (PDM) and Dense Wavelength Division Multiplexing (DWDM) techniques are also used in this system to increase total system data rate. For the ultra - high capacity need of SDM, Few Mode Fiber (FMF) was proposed as SDM best technology for obtaining ultra - high bit rate systems with long haul transmission. Inter - mode losses that appears in higher - order - modes was the most problem to be resolved. In this thesis, the description and design of three SDM systems were explored by using both QPSK and 16QAM modulation formats : single channel SDM system with PDM technique, 8 - DWDM channels over 7 modes SDM/PDM system, and 16 - DWDM channels over 10 modes SDM/PDM system proposed as future of ultra - high capacity optical system.By using 16QAM format and bit rate per channel of 40Gb/s, the maximum long reach of our designed single channel SDM/PDM system is 1020Km. A transmission reach of 760Km was achieved for 8 - WDM - 7modes - SDM/PDM system and 260 Km for 16DWDM - 10modes - SDM/PDM. At QPSK modulation format the maximum demonstrated reach was 1460 Km for single channel SDM/PDM system. A long - haul transmission of 1080 Km was recorded for 8 - WDM channels - 7modes - SDM/PDM system and 510 Km for 16 - DWDM channels - 10modes - SDM/PDM system.The total bit rate of single channel - 3modes SDM/PDM system was 240G/s at 40Gb/s bit rate per channel. The total bit rate was achieved by using 8 - DWDM channels - 7modes SDM/PDM system is 4.48 Tb/s at 40Gb/s. The highest bit rate was achieved by using 16DWDMchannels - 10modes SDM/PDM system so that the total achieved bit rate is nearly 12.8Tb/s.Chromatic Dispersion (CD) compensator using Digital Signal Processing (DSP) was proposed to compensate chromatic dispersion losses. Frequency and phase estimators were proposed in the designed systems to remove frequency offset and phase change by using Viterbi and Viterbi algorithms.Adaptive MIMO equalizer using constant modulus algorithms was proposed to compensate deferential group delay, polarization mode dispersion, and other losses simultaneously. Numerical results demonstrated that the methods are very effective in compensating the narrow band filtering and are very robust to channel estimation noise.The demonstrated systems were designed and tested by using (VPI transmission maker v.9.5) powerful software package.SDM techniques provided us with an important source to obtain more system flexibility, scalability, and capacity.

تصميم مضاعف تناظري خطي محسن بنطاق واسع يعمل باربعة ارباع == Design Of Improved Wideband Linear Four Quadrant Analog Multiplier

اسم المؤلف: رسل صلاح خضير

اسم المشرف: عبد الكريم مخيف عبيس

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2017

الموضوع الدقيق: هندسة الالكترونيك والاتصالات

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: استخدمت المضاعفات التناظرية على نطاق واسع في دوائر الاتصالات والشبكات العصبية ككاشفات للطور ومضاعفات للتردد ودوائر لمزج الاشارات والتضمين وفك التضمين. في التطبيقات التقليدية مثل دوائرالتضمين تعتبر ترددات التشغيل والسلوك الخطي للانظمة والمديات المسموح بها | Analog multipliers have been widely exploited in communication circuitries, phase detectors, neural networks, frequency multipliers, mixers, and modulation and demodulation circuits. In conventional applications, such as modulation circuits, the linearity, frequency of operation, and input voltage ranges are issues of great importance for multipliers. This work targeted these issues through the design of two types of four quadrant analog multipliers operating in wideband frequency ranges and having very high linearity with input and output voltage ranges of ±10V.The first wideband four - quadrant analog multiplier is designed using wideband squaring and operational amplifier (OPAMP) circuits. The wideband OPAMP is designed using 10 NMOS transistors based on 0.35 µm NMOS technology with supply voltages of ?12V. The wideband OPAMP has exhibited an open loop voltage gain of 3336545. The squaring circuit is built using two NMOS transistors and two wideband OPAMPs. The first wideband multiplier is built using two identical squaring circuits, two difference amplifiers, and one summing amplifier. It is characterized by high input - output linearity range of - 10 V to +10 V for both inputs, ±10 V input and output voltage ranges, and cutoff frequency of about 5 GHz. The second wideband four quadrant analog multiplier is designed using NPN bipolar junction transistors. It is built with two main circuits, which are the multiplier cell and the output circuit. The multiplier cell is built using a modified Gilbert multiplier, while the output circuit is a high gain circuit designed for changing the differential output of the multiplier cell to a single output having a voltage range of ±10 V. The multiplier circuit is designed with supply voltages of ?12 V. It is characterized by high input - output linearity range of - 10 V to +10 V for both inputs, ±10 V input and output voltage ranges, and cutoff frequency of about 1 GHz.Both multipliers are designed and tested on PSpice in ORCAD / Version 16.6.

بناء معيد ترميز تكراري شبه مثالي للاشارات المرمزة المعتمدة على مخطط تانر == Implementation Of Modified Suboptimal Iterative Decoding For Tanner - Graph Based Coded Signals

اسم المؤلف: محمد ثامر نصر

اسم المشرف: احمد عبد الكاظم حمد

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2016

الموضوع الدقيق: هندسة الالكترونيك والاتصالات

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: في هذا العمل, تم اقتراح خوارزميتين لتحسين اداء معيد الترميز التكراري التجميعي. الاول انجز باضافة رموز ارشاد بين سيل البيانات التي تدخل الى المرمز. في هذه الطريقة, رموزالارشاد ترمز مع البيانات المدخلة (رموز الارشاد المرمزه او الداخليه) مقارنة بالطريقة الاع | In this work, two algorithms were suggested in order to improve the performance of systematic RA decoding. The first one was accomplished by the insertion of pilot symbols between the data stream that entering the encoder. In this way the pilot symbols are encoded along with the input data (encoded or internal pilots) in contrast to the usual way where pilots are inserted after encoding (unencoded or external pilots). The positions where pilots should be inserted are chosen in such a way that to improve the minimum Hamming distance and/or to reduce the error coefficients of the code. Moreover, the known pilots have higher reliability than data and can significantly improve the initial decoding.The second proposed algorithm includes the utilization of the inserted pilots to estimate scaling (correction) factors. Two - dimensional (2D) correction system was suggested in order to enhance the performance of traditional Minimum - Sum (MS) decoding of regular RA codes. By calculating the mean square difference (MSD) between the values of received pilots and the a - posteriori data of bit and check node related to them, which are created by the MS decoder, an adaptive method can be achieved for getting the correction factors.Since encoded pilots in systematic RA code are embedded in data, it is possible to puncture all or part of them to increase the code rate. The pilots still have their effect on increasing the minimum Hamming distance.Extensive simulation tests reveal that the suggested quasi - optimal algorithms supply error performance be able to compare as Sum - Product (SP) decoding whilst maintain less complexity. Practical experiments are carried out by utilizing the capability of data acquisition toolbox supported by MATLAB to provide a hardware interface with the computer sound card. Here, the sound card plays the role of ADC and DAC converter in the physical layer. A different graphical user interfaces (GUI) are designed for the transmitting and receiving terminals to facilitate the selection of different code options. Signals are transmitted over wireless channel using a 2.4 GHz band indoor audio tranceiver. According to the aquired results, the modified coding system outperforms the original one when it is tested over AWGN and fading channels. An improvement may be realized about 1.5 dB and 1.3 dB at BER=?10?^( - 5) for punctured and unpunctured systematic (50,35,3,7) code with adaptive scaling, with three encoded pilots over AWGN channel and about 3.4 dB and 3.3 dB at BER=?10?^( - 4) for punctured and unpunctured systematic (50,35,3,7) code with constant scaling, with two encoded pilots over fading channel.

مراقبة انذار المرضى عن بعد الزمن الحقيقي اعتمادا على الصحة الالكترونية الصحة العنكبوتية الصحة الخلوية وشبكات التحسس اللاسلكية حالات الدراسة موضع منام المريض سكر الدم استجابة الجلد الكلفانية والتخطيط العضلي == Remote Patients Monitoring / Alarming In Real Time Based On E - Health / I - Health / GSM - Health And WSN, (Case Study : PP, BG, GSR And EMG

اسم المؤلف: علي جاسم رمضان

اسم المشرف: سمير جاسم محمد | محمود شاكر نصر

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2014

الموضوع الدقيق: هندسة الالكترونيك والاتصالات

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: Patient's health monitoring / diagnosing systems have become the focus of attention of researchers today. At the present time, the researchers are dealing with the E - health fields to develop and improve the healthcare systems and they work to combine the GSM and Internet technologies together.In the presented work, the researcher designed a portable real time wireless medical system for monitoring / diagnosing the patients' status based on E - health / GSM - health / I - health and wireless sensor network (WSN) under ZigBee protocol, and to support alarming and printing of medical reports subsystems.The presented system consists mainly of four subsystems, which are sensing & data transceiver, base station (BS), GSM and Internet. Where sensing & data transceiver subsystems be in the patients' lobbies and connected remotely with the base station (BS) subsystem in the wireless sensor network that collect and display the sensing data in it. Also in the designed system, the GSM and Internet technologies are inserted practically in the network.The implemented system measures the biomedical data utilizing a group of sensors that are not available in the country's hospitals in such integrated system, which are the patient position sensor (PPS), galvanic skin response sensor (GSR), blood glucose sensor (BGS), and electromyography sensor (EMG). Moreover, the system has the ability to add many other sensors.In the proposed system, three nodes (lobbies) are considered according to the facilities available, but it can monitor / diagnose unlimited patients' numbers.The system monitors the sleep position and skin conductance (indicator to patient's calm) of the patients in real time with alarm for each abnormal case in the base station (BS) and in lobbies, and it also follows up the glucose rate in patient's blood and diagnose the electromyography (muscle and nerve) status.The GSM subsystem (GSM - health) is used for remotely following - up the patients' status by sending SMS alarm in time for any abnormal case of the patient's sleep position and skin conductance, also it has ability to send the glucose data to doctor's phone. All these services are performed by using a personal phone device only without using any additional GSM modem or other apparatus, so this method reduces cost, complexity and delay time of the system that's done by interfacing the phone with the PC directly via USB port and the messages sending procedure executed using special SMSs AT commands, so the doctors become able to communicate with BS using SMS or voice calling to give the fast and direct necessary guidance.The Internet subsystem (I - health) is another excellent service for the presented system, by which remotely following - up the glucose levels by uploading the glucose data to a specific web site. It is performed by designing a web site that is programmed using VB.NET and ASP.NET languages. of course, user login feature is added to protect the privacy of patients and feedback comments feature between the doctors and patients to take the important guidance.The system has ability to introduce a printed hard copy report about the patient's electromyography status or result and blood glucose levels, by utilizing VISUAL BASIC program. Moreover, it performs searching process about the active nodes in network, this means that it detects any new node (new patient) and put it in service. In addition, the system records the patient's information and stores his health data for any archiving process or statistical study.The main hardware that is used in the implemented system includes MCUs, sensors and transceivers, and used the LABVIEW program to display the data in its GUI windows in the computer of BS.The system has been implemented practically at low cost and low power, gave expected and accurate results, and presented to the specialists doctors and they have expressed their conviction and effectiveness of the system in practice.

تقييم اداء نظام تحويل المويجات المنفصلة - مازج تقسيمات التردد المتعامد المشفر للتطبيقات ذات السرعة العالية == Performance Evaluation of DWT - COFDM System For High Speed Applications

اسم المؤلف: ضفاف طلال شاكر

اسم المشرف: سعد سفاح حسون

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2014

الموضوع الدقيق: هندسة الكهرباء

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: The internet revolution has created the need for wireless technologies that can deliver data at high speeds in a spectrally efficient manner. However, supporting such high data rates with sufficient robustness to radio channel impairments requires careful selection of modulation techniques. The demand for high - speed mobile wireless communications is rapidly growing. OFDM technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems. Abstract In this thesis, Inverse Discrete Wavelet Transform (IDWT) is used as a modulation technique instead of Inverse Fast Fourier Transform (IFFT) with coded OFDM due to its excellent orthogonality and superior spectral containment properties of wavelet filters. Coded Orthogonal Frequency Division Multiplexing (COFDM) is the same as OFDM except that forward error correction is applied to the signal before transmission. This is to minimize errors in the transmission due to lost carriers from frequency selective fading, channel noise and other propagation effects. Convolutional code is used in this thesis as a forward error correction code. The proposed (DWT - COFDM) system is simulated under the effect of additive white Gaussian noise channel, and multi - path fading channel at different values of Doppler frequencies (22.2Hz, 41.7Hz and 444.4Hz) which are the most significant impact channel parameters on the bit error rate performance. The proposed system is also compared with DWT - OFDM, FFTCOFDM and FFT - OFDM systems. It is found that the proposed system can significantly improve the BER performance and it performs better than the other three systems. On the other hand, convolutional code and DWT is used to reduce the peak to average power ratio (PAPR) which is considered the serious problem in any wireless communication system using multi carrier modulation techniques like OFDM systems by using two of the most important non distortion techniques which are selective level mapping (SLM) and partial transmit sequence (PTS) and the results show that the proposed systems for SLM and PTS techniques can perform better than the conventional SLM and PTS. The results also show that the proposed PTS technique performs better than the proposed SLM technique.

اكتشاف العطل الارضي المنفرد واخماده ذاتيا باستخدام السيطرة على ملف بترسون في شبكة التوزيع == Detection of Earth Fault And Self - Extinguishing By Controlling Petersen - Coil In Distribution Grid

اسم المؤلف: فريال ابراهيم الظفيري

اسم المشرف: عبد الغني عبد الرزاق عبد الطائي | قاسم كرم عبد الله

الموضوع العام: هندسة الكهرباء والالكترون والاتصالات

السنة: 2015

الموضوع الدقيق: هندسة الكهرباء - قدرة ومكائن

الدرجة: ماجستير

الجامعة: جامعة بابل - كلية الهندسة - قسم الهندسة الكهربائية

اللغة: الانكليزية

مكان الجامعة: بابل

الصفحات الاولى:

المستخلص: ان اكثر الاعطال شيوعا والتي تتعرض لها الشبكة الكهربائية في العالم هو Single Line to Earth حيث ان عطل احدى الاطوار مع الارضي في الشبكات الكهربائية, يسبب هذا قوسا كهربائيا اضافه الى جهد كبير , اكبر من جهد الطورين مع بعضهما مما يزيد خطورة الفصل والعزل في ال | All over the world, the most common faults in the distribution network is the single line to ground fault. A single phase fault with the earthing in the distribution networks causes electrical arc as well as high voltage than the two phases together which increase the danger of separation and isolation in networks. Consequently, this case can be controlled through Peterson Coil which turns off or reduces the electrical arc that makes the network safer. This work has using technique to detect the earth fault in the single - phase by distinguishing between the higher and the lower values of the currents. Also, this technique is used to detect the capacity of earthing network lines and the possibility to adapt the capacitor for inductance in order to detect the electrical arc during faults and to detect the earth leakage.Moreover, we have used many methods to control Peterson coils such as using PID Controller , Fuzzy Logic Controller, Hybrid control PID and Fuzzy System and Adaptive Neural Fuzzy Inference system, to determine the earth fault current at values equal to the current in the two sound phases. To getting best results for the fault current through conducting lab experiences by using DC Servo motor and Arduino. And the fault current is converted from the rated current, thus thousands of tons of copper cost are save. They were used to carry this high voltage. Finally, the first practical part (Simulink) was implemented through Mat lab (R2011a) and (R2013a) , On the other hand, the second practical part was in the lab, where servo motors Where used, variable and non - variable inductance , the drive to isolate the control loop from the power, PID and PWM, have also used the Arduino system to program the overdrive.