عرض: 25 50 75 100 النتائج

نتائج البحث: 25 من أصل 5,034

دور خطابات الضمان في ارباح المصرف وضمان حقوق المستفيدين : بحث تطبيقي لعينة من المصارف التجارية الخاصة == The role of letters of guarantee in the profits of the bank and guarantee the rights of beneficiaries Applied research of a sample of private commercial banks

اسم المؤلف: سندس علي خليفة السعدي
اسم المشرف: سالم عواد هادي الزوبعي
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: العلوم المصرفية
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: يسعى هذا البحث الى تحديد تاثير خطابات الضمان (المتغير المستقل) في ارباح المصرف وضمان حقوق الجهات المستفيدة (كمتغير تابع) بوصفه بحثا تطبيقي في مصرف (الشمال للتمويل والاستثمار،بغداد، الخليج التجاري).الذي انطلق من مشكلة مفادها : 1 - ان خطابات الضمان لا تساهم في زيادة ارباح المصارف بشكل يتناسب مع حجم الاعباء التي تتحملها المصارف في مثل هذا النوع من النشاط.2 - ما مدى مساهمة خطابات الضمان في ضمان حقوق الجهات المستفيدة عند تنفيذ العقود والمناقصات وتقليل المخاطر التي تعاني منها هذه الجهات في تنفيذ عقود المناقصات من قبل شركات المقاولة.ويتمثل الهدف الرئيس للبحث في بيان الاسباب التي ادت الى تدني مقدار ارباح المصارف من خطابات الضمان وتحديد المخاطر التي تعاني منها الجهات المستفيدة من خطاب الضمان.خرج البحث باستنتاجات اهمها : 1 - من الامور التي تم ملاحظتها انه ليس هناك نظام احتساب كلف العمليات المصرفية ومنها خطابات الضمان وما ينتج عنها من مصروفات عند اصدار الخطاب في المصارف عينة البحث.2 - من المعوقات التي تحصل للجهات المستفيدة يتم تحرير خطابات الضمان من مصارف تقع في المحافظات مما يؤخر او يعرقل تجديدها.كما قدم البحث جملة من التوصيات كان من ابرزها : 1 - نوصي بوجود وحدة محاسبية خاصة بالمصارف بحساب كلف العمليات المصرفية ومنها كلفة اصدار خطابات الضمان.2 - نوصي بوجود وحدة مستقلة في كل دائرة حكومية تابعة لوزارة او غير مرتبطة بوزارة مهمتها البحث عن مدى مصداقية الجهة المنفذة للعمل. | This Research endeavored to determine the effect of the Letters of Guarantee (The Independent Variation) in the profits of the bank and to ensure the rights of the beneficiary entities (Accredited Variation) as an applied research in (Al - Shemal Bank for Funding and Investment, Baghdad Bank and Al - Khaleej Trade Bank). This research started from a problem that : 1. The Letters of Guarantee are not contribute in increasing the profitability of banks in a way commensurate with the encumbrances incurred by the banks in such type of activity.2. The extent of the Letters of Guarantee contribution in ensuring the beneficiaries' rights when executing contracts and tenders and reducing the risks that the said entities are suffered from in implementing the tenders contracts by the contracting companies. The main goal of the research is to illustrate the reasons that led to the decrease in the profitability of bank from the Letters of Guarantee and identifying the risks that the beneficiaries from the Letters of Guarantee are exposed to.The research has reached to the following most important outcomes : 1. It has been observed that there is no system for counting the bank operations costs including the Letters of Guarantee and what resulted of expenses when issuing the Letter in the samples banks in this research. 2 - Also among some obstacles may encounter the beneficiaries is the drafting the Letters if Guarantee from banks located in the provinces that obstruct their renewing. The research has offered the most prominent recommendations which they are : 1. We recommend to establish an accounting unit for banks to count the costs of bank operations including the Letter of Guarantee cost.2. YEstablish dependant unit in each governmental department to be affiliated to a ministry or not related to it, its task is to know the extent of creditability of the entity performing the work.

امثلية استخدام الانترنت باستعمال انموذج التخصيص المتعدد للبيانات الضبابية تطبيق في وزارة العلوم والتكنولوجيا == Optimizing the use of the Internet by using the model of multi - assignment of the data fuzzy Application at the Ministry of Science and Technology

اسم المؤلف: زينب فليح حسن الزبيدي
اسم المشرف: لميعة باقر جواد الجواد
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: بحوث العمليات
الدرجة: ماجستير
الجامعة: جامعة بغداد
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: We will building in this research multi - assignment model with data fuzzy for the purpose of its application in the information technology department to develop application software center and systems integration in the Ministry of Science and Technology where there are specific hours for the use of the internet line specific task and on a specific line periods of continuous time, has been to get the data through a questionnaire and personal interviews with the directors of the centers in the department concerned as well as the performance conducted with employees experiments, has been building a model multi - assignment on three axes, depending on the number of employees, number of tasks, and the number of lines available, the use of the correct programming method and the method of reduction to for at the optimal solution for the model after removing the fuzzing of data Pascal method to the center of the triangular numbers blurry triple and also a method Robert Ranks and use model. Resolve WinQSB program Lindo, has been used Exell2007 Program, The research has come to the next target (distribution of staff appropriately to perform all their assigned tasks on three lines at specific times during the official working hours) . Identified research problem (lack of lines and distribution of non - optimal staff), and thus research found towards the goal of search mechanism and conclude Search that the integer programming method is suitable to solve the multi - assignment model therefore recommend follow optimum results we have obtained for the distribution of staff is right

تاثير ثوابت كروسبي في تطبيق ادارة الجودة الشاملة : دراسة استطلاعية في الشركة العامة للسمنت العراقية == Effect of Crosby absolute in the implementing Total Quality Management /A survey study in Iraqi cement state company

اسم المؤلف: رنا حمزة سلمان
اسم المشرف: سمير كامل سعيد الخطيب
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: بحوث العمليات
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: The purpose of the current study is to know the impact of quality absolute to enforcement the implementation of the requirements of total quality management.It was the use of simple correlation coefficient to measure the correlation between variables, and the (t) test to determine the degree of simple correlation between variable, and analyze the simple regression and using (F) test to determine the regression equation, in addition to use (R2) to explain the amount of impact of independent variables over the dependent ones, and to use (Man - Whitney) test for the differences between two averages of two independent samples, and (Kruskall - Wallis) test for the difference between several independent groups .The Iraqi cement state company has been choosen as a sample for the study, the necessary information for the practiced part obtained from the questionnaire from which has been prepared for this purpose and distributed to (100) employee (a sample).The study reached to several conclusions the foremost among them is that there is an impact absolute of quality over implementing the requirements of total quality management in the Iraqi Cement state company, and the possibility of application the computerized system which has been suggested in the other organizations as well as the organization of study sample.The study concluded many recommendations s.

دور التفتيش في تحقيق الامتثال المصرفي : دراسة تطبيقية في عينة من المصارف العراقية == The role of inspection in achieving compliance banking An applied study in a sample of Iraqi banks

اسم المؤلف: حوراء احمد سلمان العامري
اسم المشرف: حمزة فائق وهيب الزبيدي
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: العلوم المصرفية
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: The Banking Supervision of the most important functions of the Iraqi Central Bank , through which to find a banker strong and healthy and competitive , and exercise such control over banks by the bodies of inspection to ascertain the extent of compliance with laws and regulations and the orders and instructions of banking and the safety of their financial positions .The study aimed to the statement of the concept of banking inspection , compliance and the problems and obstacles faced by the inspectors and monitors compliance down to make recommendations.In order to achieve the goal of the study , hired a researcher with previous studies in the theoretical side , as well as access to books and other sources on the subject of her research provided through which the general framework for banking supervision and monitor compliance , but the practical side has included the preparation of a questionnaire consisting of a set of questions fit the hypothesis developed by researcher , has included research sample control and inspection department at the Directorate General for banking and credit control of the Central Bank of Iraq , and Rasheed Bank , and Bank of the Middle East Iraqi investment.The researcher found a range of theoretical and practical conclusions , including : - 1 - aimed banking supervision to maintain the integrity of the economy and protect it from exposure to currency and financial crises may adversely affect the stability as well as protection of the rights of depositors and shareholders .2 - The statistical analysis of the research sample answers important role in achieving compliance inspection banking , and this proves the hypothesis of research that indicates that the application of the provisions of the Banking Inspection will enable banks to deal with distractions and negatives and enhance the positives in their work .3 - includes a section control and inspection in the Iraqi Central Bank inspectors with diverse disciplines Abstract( Law , languages , accounting, .. ) they have the capabilities and potential , but they need to increase the courses and training programs for inspection , to develop their potential.Find out as a set of recommendations , including : - 1 - We recommend more frequent inspection visits snap to make sure the banks comply with the laws , regulations and instructions issued by the Central Bank of Iraq .2 - We recommend that the central bank to hold regular meetings with the monitors compliance twice , or three times during the year to identify the problems and constraints faced by their work.3 - hold an annual conference with the participation of stakeholders , which monitors the work of banks ( public, private and mixed ) such as the CBI and the Ministry of Finance, the Office of Financial Supervision , and the Registrar of Companies , and monitors compliance, auditors breakers , and the Association of Iraqi private banks to determine the reality of compliance with banking in Iraq in general , The problems and obstacles facing the work of banks , and to provide solutions and recommendations to get to work safe and sound banking

العوامل المؤثرة في تسويق التامين الجماعي : دراسة ميدانية في جامعة بغداد == Affecting factors incollective insurance marketing / A field study at the University of Baghdad

اسم المؤلف: بتول عبد علي غالي الخيكاني
اسم المشرف: احمد محمد فهمي سعيد البرزنجي
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: التامين
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: اصبح نشاط تسويق الخدمات التامينية من الاسس المهمه في العالم ، لتوفير متطلبات البيئة التحتية اللازمه لتطوره اذ يمكن الافادة منه في العمليات المتنوعه للمنظمات وقد شهدت القطاعات الخدمية بشكل عام وقطاع التامين بشكل خاص تسارع في السنوات الاخيرة من اجل الافادة القصوى من هذه الخدمة المتميزة والمهمه، لتوفير الحماية لهذه المنظمات واستمرارية اداء نشاطها .وهذا ما اعتمدت عليه الدراسه في البحث عن العوامل المؤثرة في تسويق التامين الجماعي، وكان المنهج الاستطلاعي للدراسة يتضمن تحديد ومعالجة متغيراتها ،والتي تتمثل في (الوعي التاميني لدى الافراد ،وسعرالخدمة التامينية ، والاساليب الترويجة في تسويق الخدمة التامينية ،وعامل الدين ،وعامل الدخل الشخصي ،وعامل العادات والتقاليد المجتمعية ،وعامل السن والجنس )كمتغيرات مستقلة ، وتسويق التامين على الحياة الجماعي كمتغير تابع ،ولغرض تحقيق اهداف البحث صيغت فرضيتين تم اختيارها على مجتمع العينة من السادة اساتذة الجامعة، وموظفو الجامعة وتم اختيار عينة البحث هي جامعة بغداد .واستخدم الباحث استمارة الاستبيانة في جمع البيانات والمعلومات اللازمة للدراسة ،وقد تضمنت محمورين خصص الاول للمعلومات العامة التي تتعلق بافراد عينة الدراسة .وخصص الثاني للمتغيرات الرئيسة سابقة الذكر ،وقد توصلت الدراسة الى عدد من الاستنتاجات ابرزها : 1 ـ ان السلوك الشرائي لخدمة التامين على الحياة للزبائن المرتقبين يتاثر بالخطر الذي يدركونه او يتوقعونه ، اذ ان اقبال الفرد على شراء وثيقة التامين يتاثر بمدى ادراكه للخطر المتوقع ومدى كفاية هذا التامين لحمايته من ذلك الخطر .2 ـ ان اتخاذ الفرد قرارا بشراء خدمة التامين على الحياة ، انما ينبع من رغبته في الحصول على مكاسب معينة ، وذلك عن طريق الشعور بالحاجة الى تلك المنفعة ، واتجاه الفرد ( سلبي ـ ايجابي ) نحو تلك الخدمة .3 ـ ليس للمساعدات والتعويضات التي ترد من الاقرباء والعشيرة تاثير سلبي واضح في الطلب على وثائق التامين على الحياة .4 ـ يتاثر التامين على الحياة ببعض التحفظات الدينية مما يؤدي الى العزوف عن شراء وثائقه في بعض الاحيان .5 ـ هناك ضعف في الوعي التاميني لدى الافراد ، وهذا تجسد من خلال عدم وجود فكرة عن مزايا التامين على الحياة وما يقدمه للفرد والمجتمع . دوقد توصلت الدراسة الى جملة توصيات والمقترحات منها : - 1 ـ زيادة مدركات الزبائن المرتقبين بخطورة اثار الاخطار الشخصية عن طريق المقابلات الشخصية عن طريق الاعلانات .2ـ انشاء قاعدة بيانات ومعلومات للالمام بكافة المعلومات المتعلقة بالزبائن المرتقبين،والتعمق بدراسة الخصائص السلوكية لهم للتعرف على رغباتهم وتوقعاتهم مما يساعد على انتاج وتوفير المنتج الذي يلاءم احتياجاتهم من اجل زيادة الحرص على اشباع حاجات الزبائن ، لانها اساس المنافسة في الخدمة للتميز بها في سوق التامين .3 ـ قيام شركة التامين بتكوين اتجاهات ايجابية لدى الزبائن نحو خدمة التامين على الحياة. وهذا يتم عن طريق تقديم معلومات ايجابية عن هذه الخدمة عن طريق استغلال وسائل الاعلام وبالاخص التلفزيون بالشكل الامثل وذلك لانه وسيلة مسموعة ومرئية .4 ـ اهمية مد الجسور التعاون بين شركات التامين وجامعة بغداد عن طريق اصدار وثائق تامين على الحياة الجماعي بشروط بسيطة ،ولاسيما بالمنظمة العلمية . | Became Activity marketing insurance services from foundations mission in the world, to provide environmental infrastructure necessary for its development requirements as it can benefit from it in the diversified operations of the organizations have service sectors have seen in general and the insurance sector are particularly accelerated in recent years to make the most of this unique service mission, to provide protection of these organizations and the continuity of its performance.This was adopted by the study in the search for factors affecting the marketing of group insurance, and the curriculum pilot study includes the identification and treatment of variables, which is the (insurance awareness among individuals, insurance and Saralkhaddma, styles Altroyjh in the marketing of insurance service, the factor of religion, and the factor of personal income, the worker habits and community traditions, and age and sex) as independent variables, and marketing of insurance and collective life as the dependent variable, and the purpose of achieving the objectives of the research were formulated two hypotheses have been selected on the sample society of Gentlemen university professors, and staff of the university were selected sample is the University of Baghdad.The researcher used Ala_ana form of data needed for the study and information gathering, included Mahmorin allocated first public information relating to members of the study sample .o_khass second major variables previously mentioned, the study has reached a number of conclusions, namely : 1 The purchasing behavior of the service life insurance to customers affected by the potential danger realize or expect, as the demand of the individual on the purchase of the insurance policy is influenced by the extent of realization of the expected risk and the adequacy of this insurance to protect them from that risk.2 that the individual making a decision to purchase insurance service life, but rather stems from a desire to get a certain gains, and by a sense of the need for those benefits, and the direction of the individual (positive negative) about the service.3 not for the aid and compensation received from relatives and clan clear negative impact on the demand for life insurance policies.4 Life insurance is affected by some religious reservations leading to reluctance to purchase and documents in some cases.5 There is weakness in the insurance awareness among individuals, and this incarnation by not having an idea about the advantages of life insurance and the support of the individual and societyThe study found a number of recommendations and proposals, including : - 1 increase perceptions of prospective customers seriousness raised personal notification through personal interviews by ads.2 Create data and information to familiarize themselves with all the information relating to customer prospective base, depth study of the behavioral characteristics of them to get to know their desires and expectations, which helps to produce and provide a product that suits their needs in order to increase care to satisfy the needs of customers, because it is the basis of competition in the service of excellence in the insurance market.3 by the insurance company configures positive trends among customers about the insurance service life. This is done by providing positive information about this service by manipulating the media, especially TV optimally because it means an audible and visible.4 importance of building bridges of cooperation between the insurance companies and the University of Baghdad, through the issuance of insurance policies on the collective life simple terms, especially scientific organization.

تاثيــر التفكير الاستراتيجي في الميزة التنافسية في صناعة التامين : بحث استطلاعي لاراء عينة من المدراء في شركة التامين الوطنية == An Effect of Strategic Thinking in the Competitive Advantage in the Insurance Industry An Applied Research in the National Insurance Company

اسم المؤلف: انس محمود ابراهيم
اسم المشرف: محمد علي ابراهيم العامري
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: التامين
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تزايد الاهتمام بكل من التفكير الاستراتيجي والميزة التنافسية لما يشكلانه من اهمية كبيرة للمنظمات على اختلاف طبيعة نشاطاتها, لذلك يهدف البحث الى الوقوف على واقع عمل شركة التامين واقسامهوافروعها في مجال التفكير الاستراتيجي واثرهما في الميزة التنافسية في صناعة التامين واثارة اهتمام القادة الاستراتيجيين في الادارة العليا للشركة لاهمية متغيرات البحث، يهدف هذا البحث الموسوم اثر التفكير الاستراتيجي في الميزة التنافسية في صناعة التامين الى قياس اثر التفكير الاستراتيجي في الميزة التنافسية في صناعة خدمات التامين، في الوقت الذي تتجه فيه الكثير من الدول الى الاعتماد بشكل كبير على الخدمات في اقتصادياتها, ولبلوغ هدف البحث المذكور بني مخطط فرضي للبحث تضمن المتغير المستقل والمتغير التابع، والمتغيرات الفرعية، واعتمادا على حركة المخطط صيغت فرضية رئيسية تضمنت 4 فرضيات فرعية، ولاختبار صحة الفرضيات تم اختيار عينة عشوائية لتمثل مجتمع البحث, حيث شملت العينة وقوامها40 فردا، مدراء الاقسام والفروع العاملين في شركة التامين الوطنية، وتم جمع المعلومات عن عينة البحث باستخدام استمارة الاستبيان ومجموعة من التقارير السنوية، وعولجت البيانات باستخدام مجموعة من الاساليب الاحصائية الوصفية واللامعلمية لدراسة العلاقة بين متغيرات البحث, وفي ضوء النتائج والتحليلات توصل البحث الى مجموعة من الاستنتاجات اهمهواجود علاقة تاثير بين التفكير الاستراتيجي والميزة التنافسية في صناعة التامين, وجاءت النتائج متطابقة مع فرضيات البحث، واستنادا الى الاستنتاجات خلص البحث الى مجموعة من التوصيات كان اهمها : ان للتفكير الاستراتيجي تاثير ايجابي على سوق التامين بشكل عام، وشركة التامين الوطنية بشكل خاص، وان انتهاج اسس وابعاد ومتغيرات التفكير الاستراتيجي في العمل امر من شانه ان يحقق الجودة في تقديم الخدمة التامينية . | The attention have been increased to strategic thinking and competitive advantage, because they form a great importance to organizations, so the study aim to recognize the range which achieved in their development in order to determine the strategic paths "which concerned with abilities of employment, the components of the infrastructure of strategic thinking and competitive advantage to determine the future directions for Insurance Industry,the choice of the subject of the research ((strategic thinking and competitive advantage its effect on Insurance Industry)), which aims to measure the effect of strategic thinking and competitive advantage on the Industry of Insurance services, came in the time when many countries tend to depend on services in their economics. To obtain the per mentioned aim of the research, a explanation diagram was built, that involved the dependent and independent variables and sub variables. Based on the model movement,one main hypothesis is formulated contains 4 sub hypotheses. To test the validity of hypotheses, one random samples were chosen. The sample which consists of 40 individuals presented general managers, branches managers,submanagers and workers in national insurance company .the information’s about the sample of research were collected by using the Questionnaire and a collection of annual reports, and data were processed by using a group of unparametrice and descriptive statistical means to study the relationship and effect between the research variables and dimension. In the view of the results and their analyses, the researcher reached a group of conclusions, the most important are : there is an effective relationship between strategic thinking and competitive advantage on Insurance Industry and the results became identical with the hypotheses of research. Based on conclusions the researcher gave a group of recommendations the most important are : In general, strategic thinking have a positive effect on insurance market and a special effect on general insurance companies And pursuing Transparency’s principles at work achieves the Quality in providing the insurance service.

دور التحليل الاستراتيجي في تحقيق الميزة التنافسية المستدامة : بحث استطلاعي تحليلي في شركة التامين الوطنية == Role of strategic analysis in achieving sustainable competitive advantage Search exploratory analysis in the National Insurance Company

اسم المؤلف: احمد محمد جاسم الجميلي
اسم المشرف: صباح مجيد سعيد النجار
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: التامين
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: في ظل التحديات الاقتصادية والسياسية والقانونية والاجتماعية التي تواجه منظمات الاعمال وتطور النظم الادارية وتكنولوجيا المعلومات وتحديات العولمة والتجارة الالكترونية ظهرت الحاجة الى الاهتمام بالتحليل الاستراتيجي ، اذ يعد مرحلة هامة من مراحل الادارة الاستراتيجية الهادفة الى توافر المعلومات الضرورية عن التغيرات الحالية والمحتملة في البيئة الداخلية والخارجية, وذلك بهدف استثمار نقاط القوة, وتحجيم نقاط الضعف, واستغلال الفرص , والحد من التهديدات التي تواجه المنظمة, لذا انطلقت مشكلة البحث من توجه شركة التامين الوطنية لدخول النظام الاقتصادي الجديد وما يواجهه من منافسة محتدمة وضعتها امام حقيقة معرفة قدرتها للوقوف ازاء الشركات الاجنبية ومن ثم التحقق من نقاط قوتهواضعفها لمواجهة ما يمكن من التهديدات واستغلال ما يمكن من الفرص , ويهدف البحث التعرف على طبيعة التحليل الاستراتيجي في شركة التامين الوطنية وانعكاساته في تحقيق الميزة التنافسية المستدامة . اعتمد البحث مخططا فرضيا يعكس طبيعة العلاقة والتاثير بين ابعاد التحليل الاستراتيجي (القوة والضعف والفرص والتهديدات) وابعاد الميزة التنافسية المستدامة (الموقع التنافسي , والمرونة الاستراتيجية , وتكنلوجيا المعلومات, والابداع), وعددا من الفرضيات الرئيسة والفرعية التي تعكس هذه العلاقات. ولاختبار صحة الفرضيات تم جمع البيانات المتعلقة بمتغيرات البحث باعتماد استبانة اعدت لهذا الغرض واستخدام اساليب احصائية باستخدام البرنامج الاحصائي SPSS - 17)).توصل البحث الى مجموعة من الاستنتاجات , كان اهمهواجود علاقة ارتباط قوية وتاثير بين التحليل الاستراتيجي والميزة التنافسية المستدامة في شركة التامين الوطنية وتم وضع مجموعة من التوصيات منها , ضرورة تعميق الوعي بمفاهيم الادارة الاستراتيجية , وبالاخص فيما يتعلق بالتحليل الاستراتيجي والميزة التنافسية المستدامة , لتحديد المؤشرات المؤثرة في تحقيق الميزة التنافسية المستدامة, وضرورة الاخذ بنظر الاعتبار تحديد التوجهات الاستراتيجية للشركة في ضوء نتائج التحليل الاستراتيجي كي تتمكن الشركة من فرض سيطرتها على البيئة الداخلية والخارجية وبالتالي يسهم ذلك في تعزيز الميزة التنافسية المستدامة . | This study launched to pay attention to the necessity of strategic analysis in the shadow of the economic, political, legal and social challenges in the external environment of business organization, the development of administrative systems, information technology, the globalization challenges and the electronic trade system. It can be considered an important stage of strategic administrative, aiming of providing managers with necessary information about the current and possible alternations at both external and internal environment to invest the strengthen points , incapacitation the weak points, gaining opportunities and to limit the threats facing the organization. Accordingly, the intellective cover of the study problem is started off from the approach of insurance field in Iraq toward entering the new economic system and raging competition might face which put insurance companies in front of the truth to know its abilities that it stands on comparing with the foreign companies. Therefore, this study endeavors to be acquainted on complexion of strategic analyses interdependent by the National Insurance Company and the reversing of these analyses on achieving the feature of permanent competition. The study has depended on presumptive modal that reflecting the related nature and the influence between the dimensions of strategic analyses on SWOT : (strength, weakness, opportunities, threatening) and the nature of permanent competition feature (competitive place, strategic flexibility the information technology, creativeness), the outcomes were a set of main and subsequent assumptions, reflecting these relationships. To experiment the rightness of the presumptions in respect of this study varying, the data is collected by depending on questionnaire prepared for this purpose and to serve the aims of data and information - processing, the study has utilized statistical manners through using the statistical program (SPSS - 17). The study reached to a group of conclusions; the prime one is the existing of strong bind relation and the influence between the strategic analyses and the permanent competition feature in the company under research and the study assumptions were admitted. By leaning on the conclusions reached by the study, group of recommendations are applied chiming with reality of the study and its importance such as the necessity of deepening the concepts of consciousness of strategic administrative, especially in respect of strategic analyses and permanent competition feature, with appointing internal and external environment indications and which of these indications has a greater effect in achieving the goal of competition feature , the necessity to consider the limit of strategic directions of the company in the light of strategic analyses in order to enable the company directing its control on internal and external environment, consequently the permanent competition shall be promoted

مقدرة البنك المركزي العراقي على مواجهة المتغيرات الاقتصادية وحماية الجهاز المصرفي : بحث تطبيقي في عينة من المصارف التجارية الخاصة == The ability of the Iraqi Central Bank on the face of the economic variables and the protection of the banking system An Applied Research in the Commercial banks

اسم المؤلف: احلام حميد كريم العباسي
اسم المشرف: حسين عاشور جبر العتابي
الموضوع العام: الادارة والاقتصاد
السنة: 2014
الموضوع الدقيق: العلوم المصرفية
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: يتناول هذا البحث موضوع دور البنوك المركزية لحماية الجهاز المصرفي من خلال المؤشرات الاقتصادية وانعكاسها على الجهاز المصرفي من خلال نظام مؤشرات الحيطة الكلية (MPI) لسلامة النظام المالي، الذي تم تطويره كجزء من برنامج مشترك للبنك الدولي وصندوق النقد الدولي، ويضم هذا النظام نظام CAMELS)) مضافا اليه المؤشرات الكلية. وقد تركزت مشكلة البحث بالاتي : 1. قد تؤدي حالة تعثر لاحد المصارف الانتقال الى مصارف اخرى وبالتالي حدوث ازمة مصرفية يصعب السيطرة عليها.2. تعاني المصارف العديد من المخاطر التي يجب تحديدهواقياسهوامتابعتهوامراقبتها من قبل الاجهزة الرقابية, وتقديم المعالجات لها حماية لها مثل مخاطر السيولة, ومخاطر السوق, والمخاطر التشغيلية, والمخاطر الائتمانية, ومخاطر سعر الصرف , مخاطر اسعار الفائدة ,والتي توثر على ارباح المصرف والقيمة الاقتصادية له.3. ضعف قدرة البنوك المركزية على التنبؤ بالازمات المصرفية التي تتولد من جراء التقلبات الاقتصادية . وتبرز اهمية البحث من طبيعة الموضوع الذي يسلط الضوء على البنك المركزي وسياسته النقدية الهادفة الى حماية الجهاز المصرفي , وبيان تاثير مؤشراته الاقتصادية على العمل المصرفي .وينطلق البحث من فرضية رئيسة تنص على ان ( توجد علاقة ارتباط معنوية بين البنوك المركزية من خلال مؤشرات الانذار المبكر وبين الازمات والتعثر المصرفي) وكذلك ان (التنبؤ من خلال المؤشرات الكلية تؤدي الى عدم احتمالية تعرض الجهاز المصرفي للازمات) . وقد توصل الباحث الى جملة من النتائج كان ابرزها : 1. اهم وظائف البنك المركزي هو القيام بمراقبة الوضع الاقتصادي وتوقع المشكلات الاقتصادية قبل وقوعهوااتخاذ الاجراءات المناسبة لتفاديهوامعالجتها او التخفيف من تبعاتها.2. يتمتع الاقتصاد العراقي بحالة عدم الاستقرار الاقتصادي خلال السنوات الماضية مما انعكس ذلك بدرجات متفاوتة على الجهاز المصرفي .3. قام البنك المركزي العراقي باستخدام ادوات السلامة المالية كالحد الادنى لراس المال والبالغ 100 مليار للمصارف القائمة حتى عام 30/6/2013 و250 مليار دينار خلال السنوات اللاحقة.وكانت اهم التوصيات : 1. تستخدم الرقابة الوقائية من قبل البنك المركزي لمراقبة وتتبع اعمال المصارف التجارية من منظور السلامة والامن للاصول المصرفية وزيادة المقدرة على التنبؤب الكوارث والازمات المصرفية قبل حدوثها،وبالتالي الحد من اثارها السلبية على الجهازالمصرفي حتى تستطيع السلطات النقدية الوقاية منهوامنع انتقالها الى بنوك اخرى.2. تحتاج البنوك المركزية الاقتصاديين وتصميم البحوث الموجهة نحو متابعة اخر التطورات في مجال الاقتصاد والاعتراف باهميتها . | This paper deals with the subject of the role of central banks to protect the banking system through economic indicators and its impacts on the banking system through a system of indicators precaution College (MPI) for the safety of the financial system , which was developed as part of a joint program of the World Bank and the International Monetary Fund , and includes this system system CAMELS) ) plus indicators college.The focus of the research problem the following : 1 . The case could lead to a faltering banks move to other banks and thus a banking crisis is difficult to control.2 . Suffer banks, many of the risks that must be identified , measured and followed up and monitored by regulatory agencies , and provide processors have to protect them , such as liquidity risk , and market risk , and operational risk , and credit risk and exchange rate risk , interest rate risk , which affect the profits of the bank and the value economic him .3 . Weakness of central banks' ability to predict the banking crisis , which is generated as a result of economic fluctuations .[And highlights the importance of research of the nature of the subject which highlights the central bank and its monetary policy aimed at protecting the banking system , and the statement of the impact of economic indicators on the baning business.The search starts from the premise that the head of states ( there is a significant correlation between central banks through early warning indicators and between banking crises and tripping ),as well as that (prediction through macro indicators lead to the failure probability of exposure of the banking system crises ). The researcher found a number of results , most notably : 1 . The most important functions of the central bank is to monitor the economic situation and predicted economic problems before they occur and take appropriate action to avoid them and treat or mitigate their consequences .2 . Enjoys the status of the Iraqi economy, economic instability over the past years , which is reflected in varying degrees on the banking system .3 . , CBI using tools such as reducing the financial viability of the minimum capital of $ 100 billion for banks in the list until 6/30/2013 and 250 billion dinars during the subsequent years .The most important recommendations : 1 . Use preventive control by the central bank to monitor and track the work of commercial banks from the perspective of safety and security of the banking assets and increase the ability to predict disasters and banking crises before they occur , thereby reducing its negative effects on the banking system so that it can monetary authorities prevention and preventing transmission to other banks .2 . Central banks need economists and design - oriented research to follow the latest developments in the field of economy and recognition of their importance.

فخار عصر العبيــد مـن موقع المسيحلــي : دراسة فنية اثارية

اسم المؤلف: نوري عبيد كاظم محمد
اسم المشرف: قصي صبحي عباس الجميلي
الموضوع العام: علم الاثار
السنة: 2014
الموضوع الدقيق: الاثار القديمة
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Al - Massiehly Site is one of the areas located in the district of Shirqat in Salahuddin province, which witnessed charismatic human activity over the history. It also has its importance in Mesopotamia rich history of diverse civilizations and achievements in various fields. Such achievements had their impacts on other contemporary ancient civilizations which existed beside Mesopotamia successive triumph civilizations. One of the most important of such achievements was the invention of pottery, which had a significant impact on the agricultural life and its fruitful outcomes in Mesopotamia.The significance of the invention of pottery production lied in its great influence on social, economic, commercial, religious and artistic life due to the role it played in fulfilling a vital need for a material that is applicable to many essential areas from basic needs of household uses such as keeping liquids or cooking food, to storing some grains such as barley and wheat which have always been associated not only with village and farmers' life; but even with vibrant urban life close to the farming .From there emerged its economic and commercial significance after the emergence of important institutions such as the temple with its high profile position in terms of religious, economic and political importance, which had had a great influence on the hearts of the sons of Mesopotamia. Moreover, pottery pots had their significant impact on religious practices which, in turn, influenced the community customs and traditions as well as the after death rituals, as many of those pots were buried with the dead; in what is nowadays known as the "Funerary Gifts".Pottery was not totally devoted to domestic use as a means of storage or a bowl for drinking, but it also was a masterpiece which has communicated through the ages the message of civilization and the great diversity in areas of thought and artistic creativity, through what those pots carry of decorative methods variety, whether that was geometrical or natural decorations symbolized by geometrical or botanical shapes or by some abstract shapes of human and animal anthropomorphism. These arts are considered as messages which served us well in the know about of the life of ancient people of Mesopotamia, whether in social, economic or technical aspects.Pottery also forms an important link, if not the most important of all, for researchers, through which they could trace the chronology of the roles of civilizations incubated by this historical site, particularly those dating back to the prehistoric times, where a pottery fragment is considered to be the best guide to the habitats of history and the key to many question marks and exclamation points. The aim of studying this type of pottery, which dates back to prehistoric times, is to shed light on the status of this site and the amount and importance of what has been obtained from it of archaeological findings belonging to Al - Ubaid period, as the focus of the study will be such historic monuments from archaeological and technical/ artistic angle as well as the expansion this era had witnessed which included the entire of Mesopotamia and neighbouring countries. Pottery pots, in general, had such technical characteristics and artistic features which were unique to Al - Ubaid period, but were superficially addressed by many researchers while they are worthy better highlighting in a wider scope study, as they were found in several archaeological sites in and out of Mesopotamia, and many archaeological excavations have been dug out which date back to the Al - Ubaid period . Our study of the heritage of this Era has been based on archaeological excavations records as well as reviewing of local researches and studies published in the Journal of Sumer and Arabic studies including the Syrian Arab Archaeological Annual books, in addition to other important references including the study of professor Dr. Taqi Al - Dabbagh on old pottery, and on the foreign sources and references represented by foreign excavations reports at some sites in Mesopotamia, including excavations of the French mission at the site Al - Owaili, as well as the (Iraq) magazine which dealt with some specific aspects of this period . Such sources and references were an excellent guide and a reliable assistance in the opinion confirmation on the subject.In order to focus on one specific aspect of the many aspects of this study, and due to the multiplicity and diversity of the archaeological excavations findings in many sites in Mesopotamia and beyond, it must be stressed that the Al - Ubaid period is one of the important ages which had inherited from its predecessors and left us, the successors, a wealth of culture of impact both at home and abroad. Study the Pottery of this period has not attained a great deal of interest or extensive studying research, taking into consideration its term of time which stretched over nearly the period of (4500 - 3800 B. C), as well as the wide geographic spread it had witnessed in Mesopotamia and neighbouring countries, with the exception of the few studies which have been mostly in foreign languages. It has, therefore, been proven necessary to pursuit research and investigation in order to access those documents in obviously tough circumstances as the country, as a whole, and the research area (Sharqat), in particular, are witnessing serious security deterioration where we faced a lot of difficulties in achieving our aspirations, including scarcity of resources and the difficulty of obtaining missions excavation report. The objective of our study is to investigate the Al - Ubaid period pottery through what had been found at the archaeological site of Al - Massiehly, in addition to conducting a comparative study between the findings of Al - Ubaid period pottery found at the site of Al - Massiehly with similar findings found in other sites of Mesopotamia including industrial techniques analysis and the forms and methods of executing decorations on the hulls of those pots.Our study on this subject was not limited to the archaeological findings alone, but we also took samples of those models in order to conduct laboratory tests and analyses on them to identify their chemical components and the materials they contain, as well as those used in their colouring and decorations.....This study had included four chapters : hapter One : titled "The Geological Formation and Geographical Environment of the Al - Massiehly site"; and has included three sections : First section : Al - Massiehly, The location, the naming, Archaeological Excavations; Second section : The Geographical Environment of the Al - Massiehly site;Third section : The Region's Natural Resources. Chapter Two : titled "Al - Ubaid Pottery : The naming - Its Technology and Styles in light of published sources; this Chapter has included two sections : First section : Al - Ubaid Pottery : The naming - Its Technology;Second section : Styles of the Al - Ubaid Pottery;Chapter Three : titled "An applied comparative study of the Al - Ubaid Pottery from the Al - Massiehly site with other sites of Mesopotamia; and the Chapter has been divided into three sections : First section : Simple Pottery (The Technology, Shapes and the Usage) Second section : Coloured Pottery (The Technology, Shapes, Decorative Patterns and the Usage)Third section : Incised Pottery (The Technology, Shapes, Decorative Patterns and the Usage)Chapter Four : It was titled "Geographical Spread of Al - Ubaid Era Pottery in Light of Archaeological Excavations and Surveys"; and has included two sections : First section : The Geographical Spread of Al - Ubaid Era Pottery in Light of Archaeological Excavations and Surveys in Mesopotamia Second section : The Geographical Spread of Al - Ubaid Era Pottery in Light of Archaeological Excavations and Surveys outside of Mesopotamia Finally, it suffices me that I have been able to shed light on this important site from prehistoric times, namely Al - Massiehly site. Should I have been successful, that would be my ultimate wish, but if mistaken, though, it would be an error of an industrious attempt, as if there was any perfection; it would have to be the Almighty God's alone

تاثير اضافة الكالسيوم على البنية المجهرية والخواص الميكانيكية لسبيكة Al - Cu - Mg == Effect of Ca Addition On The Microstructure And Mechanical Properties of Al - Cu - Mg Alloys

اسم المؤلف: نور صباح توفيق
اسم المشرف: منذر محمد راضي
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: في هذه الرسالة تم دراسة تاثير اضافة عنصر الكالسيوم بنسب مختلفة ) 3.0 المجهرية والخواص الميكانيكية لسبيكة) المنيوم - نحاس - مغنيسيوم ( , حيث تم انتاج هذه السبائك باستخدام والتي تتضمن )المعاملة المحلولية, )? السباكة الرملية وعوملت حراريا باستخدام المعاملة ا | In this thesis ,the effect of pure Ca element addition in different percents of (0.3,0.6,0.9%) on the mechanical properties of Al - Cu - Mg alloy were studied.The Alloys were produced using sand casting and heat treated using T6 which involve [solution treatment , quenching , artificial aging ], aging process were carried out at 220? C for different periods of time ranging between (5min to5hr).Also the work involves a study on the effect of Ca addition on both grain size as well as the resulting phases before and after heat treatment, samples were examined using optical microscope, Scanning Electron microscope ,X - Ray diffractometer and image - J to estimate the average grain size.The results of hardness and tensile tests for 0.6% Ca and 4hr aging shows the best response as compared to the other alloys. The hardness and strength values have been changed from (78.29HV)(110.57Mpa) during (30min)at 220?C for non - Ca content alloy to(125.9HV)(164.2Mpa) for 0.6%Ca alloy. X - Ray diffraction , results shows the basic phase that forms is Al2CuMg (S??, S? phase) which is considered as the main strengthening phase in AL alloys, and it was found that Ca addition leads to form (Al4Ca) and (Al2Ca)which delay the alloy response to precipitation hardening by delaying the formation of (S)phase. SEM images showed a large and small dimple structure and broken or cracked Al - Ca compounds particles.This indicates that the fracture was ductile fracture in the Al matrix and brittle in these compounds ,.Also presence of microvoids (porosity) on the fracture surface is formed at the interfaces between Ca compounds and Al matrix enhanced the crack propagation through their center. The presence of the secondary phases precipitates (Al2CuMg ,Al2Ca and Al4Ca) in the fracture surface also contributed to ameliorate the mechanical properties by increasing the bonding of the matrix and reduced the ductility.Also Ca addition in the range of (0.3 - 0.6%) gives rise to grains refining ,While increasing Ca content up 0.9%wt coarsing the grains, which leads to decrease the hardness and tensile strength, From these results the decrease in tensile strength with increasing Ca content over 0.9% seems to be attributed to the reduction in elongation caused by the occurrence of micro porosity due to Ca addition.

تخطيط مسار نقطي خال من الاصطدام لروبوت ممفصل ذا خمس درجات حرية == Point - To - Point Free Collision Path Planning of 5 DOF Articulated Robot

اسم المؤلف: محمد عبد الرحمن غفور
اسم المشرف: تحسين فاضل عباس
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: ان الهدف الرئيسي من هذا البحث هو ايجاد مسار لمفاصل الروبوت وللماسك النهائي في الروبوت خلال حركة الماسك من نقطة البداية الى نقطة الهدف المراد الوصول اليها خلال حيز مؤتمت بدون الاصطدام مع العوائق الموجودة في بيئة الروبوت اعتمادا على الحل العلوي لاذرع الروب | The main objective of this research is to find a path for the robot joints and gripper from the given start point to the desired goal point without collision with the obstacles which exist in the robot environment depending on the robot links upper solution. This research will investigate the problem of path planning for a 5 axis articulated robot, operating in an environment with obstacles whose boundaries are enveloped by a spherical shape. The path planning approach has been developed in the robot joint space and consists of five phases : The first phase is using Bezier, Hermit, B - spline and NURBS curve techniques considering their control points weight not constant. The second phase is to generate a sufficient number of intermediate points in Cartesian space along those curves. The third phase converts the coordinate of the generated intermediate points from its Cartesian space into joint space and move the robot gripper along the generated path. The fourth phase screens the generated four Bezier, Hermite, B - Spline and NURBS paths in order to choose the best one. The fifth phase is developing the chosen path by using proposed algorithm to improve the selected path.Both forward and inverse kinematics solutions for the robot links using Denavite - Hartenberg representation are important step to determine the manipulator's joint angles and Cartesian coordinates, that assists generating the required path which has been derived in this work.Matlab program has been used as an assistant program to analyze, sketch and implement the algorithms of forward kinematics, inverse kinematics and path planning.This work will not be limited to theoretical studies or simulations, experiments have been run with various tests, on "educational robot" Lab - Volt R5150 to assess which path is the better ability in avoiding the obstacles. The method applies to robots in a fixed and known environment. A number of experiments have been carried out to test the ability of the robot arm to reach its goal without collision It’s found that Bezier curve was the chosen path because it was the better obstacle avoidance and shorter path.

دراسة سلوك البلى الترددي لمواد مركبة ذات اساس من سبيكة المنيوم / sic تحت ظروف الانزلاق الجاف والرطب == A Study On The Reciprocating Wear Behavior of Aluminum Alloy / SiC Composites Under Dry And Wet Conditions

اسم المؤلف: عتبة حسين علوان
اسم المشرف: احمد علي اكبر اكبر
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تم في هذا البحث دراسة معدل البلى لاحدى سبائك الالمنيوم ((AA2024) (Al - Cu - Mg ومواد مركبة عن طريق تصنيع جهاز بلى ترددي تبعا للمقياس العالمي ( ASTM G133) ذو ترتيبة المسمار على المستوى (Pin on Flat) لمتغيرات مختلفة (الحمل المسلط , النسبة الوزنيه لدقائق كا | In this work the wear rate of one of aluminum alloys (Al - Cu - Mg) (AA 2024) and composite materials, has been studied by manufacturing a reciprocating wear device according to the International Standard (ASTM G 133 Pin on Flat) for different variables (applied load, weight percentage of (SiC) and sliding speed) under dry and wet (lubrication) conditions. Stir casting method has been used to prepare a composite material by using vortex technique to force the particles inside the molten metal (Al - alloy) and to distribute them regularly. The composite materials reinforced with different weight percentages of SiC (3, 6, 9, 12 wt%) are used. The base alloy and composite materials samples were tested to investigate the microstructure, and phases using optical microscope and Vickers hardness, wear rate, and the worn surfaces by using scanning electron microscope (SEM). From the results of microscopic examination it is found that the microstructure of alloy matrix was fine dendrites, in addition to the SiC particles that distributed near homogenously in the alloy matrix. The hardness test results showed that, the increasing of the weight percentage of (SiC) leads to increase the hardness, and the highest value of hardness was found at 12wt% SiC. Also the results showed that the wear rate increases with applied load for all weight percentage of reinforced particles (SiC).With increasing the load, more wear tracks, deep, and closed paths are formed and severe wear happens under dry condition but the lubrication case has less effect than dry case.It was shown that wear rate of both base alloy and composites under various conditions, increases with increasing of applied load and sliding speed but the wear rate decreases with increasing the SiC wt% in composite.Statistical method using software (Minitab 16) was used to study the effect of wear rate for both the base alloy and composite material by using three variables; applied load (X1), silicon carbide proportion (X2), sliding speed (X3), with five levels of each variable. It is concluded that the optimum weight loss under dry case was 0.0014g, The combined effect of variables and the wear rate was obtained and which variable are more influential, as shown in the equation below : D = 0.056703 - 0.002164 X2 - 0.000282 X3+ 0.000017 X1 X3 +0.000010X2 X3 While under lubrication case that the optimum weight loss was 0.0037g and the combined effect of variables and the wear rate was obtained and which variable are more influential, as shown in the equation below : L= 0.009607 + 0.002825 X1 - 0.002375 X2 + 0.001100 X3 + 0.001664 X3 2 + 0.004700 X1 X3 + 0.002700 X2 X3 The applied load (X1) and sliding speed (X3) have the largest effect on wear rate.

دراسة زاوية تعشق العدة في عمليات التفريز == Studying Tool Engagement Angle In Milling Process

اسم المؤلف: ليث فاضل شاكر
اسم المشرف: ليث عبد الله محمد
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: هذه الاطروحة تعنى بدراسة تاثير زاوية تعشيق العدة بالمشغولة على ستراتيجيات ونتائج عمليات التفريز بالعدد ذات النهايات المسطحة. تم تصميم نموذجين (CAD model) باستخدام برنامج (Solid work 2013) الاول على شكل كونتور خارجي والاخر على شكل بوكيت داخلي وبعد ذلك تم | This work focuses on the effect of controlling tool engagement angle (TEA) on the milling process planning and the results of end milling operations. Two CAD models has been designed by using Solid Work 2013 software, then G - code have been generated and simulated by using Surfcam V5 software with (Fanuc post processing). AL7075 - T6 alloy has been used for its high machinability, dry machining (no coolant) has been done on 3 - axes milling machine (C - tek) available in the University of Technology Training and Workshop Center.Feeds, speeds and other machining parameters (axial and redial depth of cut) have been selected according to machining handbooks recommendations. Machining of workpieces has been accomplished by using two techniques (two types of tool - path), first one was conventional tool - path machining (contour parallel tool - path), and the second was by using TRUEMILL technique (true engagement controlled tool - path) by Surfcam V5. Thirty experiment have been designed, four of them have been failed, ten have been accomplished and the others neglected for reasonable causes as it will be discussed. Finally a comparison between the two techniques has been made focusing on machining time, material removal rate, cutting temperature and surface roughness. The results confirm that TEA control leads to reduce machining time, we have a time reduction in about (80%) for contour machining and (57%) for pocket machining. Cutting heat was under control though the feeds and the axial depths of cut went higher, also by controlling tool engagement angle we skipped the cause of failure of some experiment in conventional tool - path machining. Surface roughness was not that affected by controlling tool engagement angle, the minimum surface roughness in hand is (0.43 µm), it is higher than the best result of a previous work for the same material by 50%.

دراسة تجريبية حول مسحوق حبيبات النحاس ذات الحجم النانوي باستخدام الترسيب الكهربائي المصحوب بالامواج الفوق صوتية == Experimental Study of Nanosized Copper Powder Using Sonoelectrodeposition Process

اسم المؤلف: حيدر ياسر ثامر الياسري
اسم المشرف: محمد جاسم كاظم | عدنان شمخي جبر
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: عملية الترسيب او التحليل الكھربائي تعتبر من الطرق التصنيعية الرئيسية التي تستخدم لانتاج مختلف الاشكال والاحجام (ضمن المدى الميكروي) من حبيبات مسحوق معدن النحاس والتي تستخدم لاحقا بواسطة تكنولوجيا المساحيق لانتاج اجزاء محددة. ايضا استخدمت ھذه الطريقة بمد | Electrolytic or electrodeposition process is considered a main way to produce many shapes and sizes (micro range) of copper powder to be used in powder metallurgy process. It is used broadly to deposit copper coatings with nanosized grains, but it is rarely used to produce nanosized particles of copper. Reaching this goal is highly dependent on the optimum design of the parameters of electrodeposition process.This work aims to study the important variables that most affect the electrodeposition process outputs. These variables are : copper sulphate pentahydrate salt concentration CuSO4.5H2O (1, 5.5, and 10) g/l, cathodic current density (12.5, 25 , and 37.5) mA/cm2, ultrasonic (20 KHz frequency) vibration amplitude (5%, 20%, and 35%) from the maximum amplitude (1 ?m), and amount of sulphuric acid H2SO4 (H2SO4 concentration > 97%) in electrodeposition cell (0.05, 0.10, and 0.15) ml/l. The study of effects of these variables is concerned with size of resultant powder particles, also their effect on the purity, morphology, and shapes of particles is studied, and the crystallinity of particles is also covered.The design of experiment (DOE) approach is applied here through Taguchi design of experiments, to manage and analyze the results and study the specific effects of each. The arrangement of variables’ levels is done using the setup of (Taguchi L9).The analysis of experiment tests of the study of electrodeposition process to get copper nanoparticles showed that all variables have effect on the size of resultant copper particles, but in different ways and degrees. The mean particle size of all samples is about 86 nm. It was found that the increasing of concentration of copper sulphate salt (1, 5.5, and 10) g/l had a negative on the increasing the size of copper particles in the range (71, 69, and 117) nm.While the increasing of cathodic current density (12.5, 25 , and 37.5) mA/cm2 had an effect of decreasing the particle size of copper in the range (114, 75, and 68) nm. The case was the same for increasing of amplitude of ultrasonic vibration, where increasing it (5%, 20%, and 35%) caused decreasing in the particle size in the range (97, 92, and 68) nm. And the effect of acid amount (0.05, 0.10, and 0.15) ml/l was multiple because it decreased the particle size first and increased it later in the range (90, 65, and 102) nm. The amount of effect of each variable on the process was calculated using specific equations of Taguchi design. It was found that the current density has the bigger effect (35%) on the resultant particle size (it minimized the size). The salt copper concentration has the second effect (34%) (it maximized the size), and thirdly the acid concentration effect is 19% (it had multiple effect on the size).Finally the ultrasonic vibration has 12% effect (it minimized the size). The optimum values of process parameters that lead to minimum size of the particles were : CuSO4.5H2O concentration = 5.5 g/l, Current density = 37.5 mA/cm2, Ultrasonic amplitude = 35%, H2SO4 concentration = 0.1 ml/l.The SEM photographs were used to examine the morphology of particles. The results show that the shape and morphology widely vary between many modes : from treelike through irregular, angular, or rounded shapes to a wellfaceted truncated octahedron. The forming of well - faceted truncated octahedron copper particles is related strongly to the presence of ultrasonic vibration which plays the role of inhibitor.Energy dispersive spectroscopy (EDS) elemental analysis of copper nanoparticles indicates the high purity of most of samples except the cases where there are traces of oxygen from very thin layer of oxides and/or carbon from residual alcohol.The x - ray diffraction studies reveal that the resulting particles are a crystalline copper element with a face center cubic (FCC) crystal structure.

تطبيق نظام دعم القرار لانشطة الصيانة في مصفى الدورة == Application of A Decision Support System For Maintenance Activities In Al - Daura Oil Refinery

اسم المؤلف: مصطفى محمد علي منصور
اسم المشرف: لمياء محمد داود | لمى عدنان حميد
السنة: 2014
الموضوع الدقيق: الهندسة الصناعية
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: في ھذا البحث تم دراسة انشطة الصيانة في معمل دھون 3 احد معامل الدھون في مصفى الدورة حيث تم اختيار ھذا المعمل كونھ الاحدث والاكثر انتاجية مقارنة مع المعملين الاخرين وتم اخذ بيانات انشطة الصيانة لمدة عشر اشھر متتاليھ من ايار 2012 ولغاية شباط 2013 علما ان وح | In this research maintenance activities in lube oil factory (3) of Daura refineries is investigated for ten consecutive months from May (2012) to February (2013).This factory is the newest and largest in its capacity compared with lube oil factory (1 and 2). Dewaxing unit produces the greater products compared with other production units in lube oil factory (3). The frequency of breakdowns and type of maintenance were identified, Pareto chart are used to analyze the collected data. Results indicated that %95 of breakdowns of different equipments (pumps, exchangers, compressors, docks, filters, furnaces and towers) are due to mechanical causes, the rest are related to electrical causes.Pareto chart highlights that the most frequent failure for both pumps and exchangers followed by compressors and other equipments of lube oil factory 3.Loss production cost due to maintenance activities was also conducted in this study so as to analyze different aspects of maintenance activities for lube oil factory (3).The total loss in production due to breakdown in the ten months of this study is (99 Billion ID). It is worth’s mentioning that pumps registered the highest losses of production cost due to bad maintenance. Accordingly, decision making for maintenance activities is a multiattribute and decision support system is crucial to signify priorities and definealternatives. ERGO (Latin word meaning "therefore" or Greek word meaning "work", used as a prefix ergo - , for example, in ergonomics and it is generalpurpose decision support system using 35 criterion to choose the best alternatives) is employed so as to evaluate detailed scope and the best of best alternatives. ERGO results indicated that Pumps are the best alternative offered to decision maker to conduct the necessary maintenance ERGO identifies the equipment with the most frequent breakdown indewaxing unit, which causes the greater loss in production cost. Compressors were identified as the highest frequency failure equipment(s). Combining two criteria (frequency of failure and lost production cost) reveals that pumps are the best alternative.

تقليل ضياعات القص في مشكلة قطع الخامات احادية البعد باستخدام نموذج برنامج جاهز == Trim Loss Minimization In One - Dimensional Cutting Stock Problem Using A Ready Software Model

اسم المؤلف: سلام قدوري داود
اسم المشرف: سوسن صبيح الزبيدي
السنة: 2014
الموضوع الدقيق: الهندسة الصناعية
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تعتبر مشكلة قص الخامات واحدة من المشاكـل العملية المهمـة، لذا ركز البحث على دراسة مشكلة قص الخامات احادية البعد بالتفصيل، حيث تم دراسة تصنيف وخصائص وطرق حل هذا النوع من المشاكل بالاضافـة الى اقتراح اسلـوب حـل مناسب لتقليل ضياعات القص الحاصلـة في بيئـة ا | Cutting stock problem is one of the important operation problems. The one dimensional cutting stock problem is considered as obvious problem which should be centered to be solved, so this thesis focuses on studying classification, characteristics and solution methods for this problem, in addition to suggest suitable approach for minimization of the trim losses in actual environment, as it is required to fulfill all of the small required items with different lengths and quantities by cutting the identical large objects which are available as stock. The variety of lengths and quantities of these small required items makes the problem obvious in complexity to fulfill all items with minimization of Integer Linear Programing (ILP) which is aided by Advanced Interactive Multidimensional Modeling System (AIMMS) software used to solve research problems. This software used because that getting of accurate details and speed results for waste amounts, number of used stocks, total and efficient cutting patterns that are generated to getoptimal solutions.Our study has been applied in an actual environment (housing project with 41 building units in Azezeiyah - Wasset) being carried out by Al - Mansour Company of Iraq Ministry of Construction and Housing, where the reinforcement steel (Rebar) with standard length is considered as a backbone component of building structure.These problems have been studied according to different rebar diameter (25 mm, 16 mm, 12 mm, and 10 mm), where each problem is subdivided and solved according to basic building activity designs (foundation, columns, beams, slabs, stairs, balcony, and front arch building entrance), trim losses which were resulting from certain activity design - diameter problem that have lengths longer than required item lengths in the next activity designs are stored and utilized to get optimal stock ratios. The utilization stock ratio which is resulting of suggested solution approach (ILP) for all these one dimensional cutting stock problems has reached (98.53%), while the utilization of used stock in that actual environment got by Al - Mansour Company is lower than this percentage.

تاثير المعاملة بالليزر على مقاومة التاكل للفولاذ المقاوم للصدا نوع 304 == Effect of Laser Treatment On Corrosion Resistance of 304 Stainless Steel

اسم المؤلف: زمن عبد الرزاق عبد الوهاب
اسم المشرف: محمد جاسم كاظم | سامي ابراهيم جعفر
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تعتبر هذه الدراسة بانها محاولة لتحسين مقاومة التاكل للصلب المقاوم للصدا من نوع 304 عن طريق الانصهار السطحى بالليزر. تم استخدام تقنية منحني تافل لتحديد معدلات تاكل الصلب المقاوم للصدا نوع 304 في محلول 3.5? كلوريد الصوديوم عند اربعة حالات مختلفة. الاولى بدو | The present work represents an attempt to improve corrosion resistance of sensitized 304 stainless steel by laser surface melting treatment. Tafel extrapolation technique was used to determine the corrosion rates of stainless steel type 304 in 3.5% NaCl in four conditions. The first condition is as received, the second sensitized microstructures at temperatures 850 oC for one hour, the third condition is treating the stainless steel alloy by laser surface melting (LSM) without sensitization. The fourth condition is studying the effect of LSM on sensitized stainless steel.The main results obtained are expressed in terms of corrosion parameters through electrochemical behavior : E°, I°, E Corr., ICorr., EP., IP, EPit. and IPit.These parameters are strongly dependent on the microstructures of the alloy. The results reveal when the potentials increase, this means that the microstructure becomes thermodynamically more stable and has good corrosion resistance. The above electrochemical parameters for sensitized 304 stainless steel show that localized corrosion rate increases due to precipitation of chromium carbides on grain boundaries and to the sensitization process affecting the phases. The LSM treatment shifts the potential toward noble direction, the corrosion current densities values shift to lower values. Generally, a change in surface hardness shows a microstructure modification in metallic bonds. The comparison of anodic polarization curves indicates that the corrosion rates for laser treated specimens are reduced. Increase in corrosion resistance probably means that most inclusions at the surface have been dissolved in the structure due to melting or alternatively, they are covered by molten materials. An interesting feature is the systematic shift of the pitting potential in the noble region with a laser treatment. This result confirms that the laser treatment can be used successfully to improve the localized corrosion resistance.

المعاملة السطحية بالليزر لحديد الزهر الرمادي باستخدام ليزر (Nd : YAG - Nano Second) == Laser Surface Heat Treatment For Gray Cast Iron Using Nano Second Nd : YAG Laser

اسم المؤلف: بلال احمد حبيب
اسم المشرف: رابحة صالح ياسين | هجران زين العابدين طعمة
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: في هذا البحث، تم استخدام تاثير معلمات الليزر لتحسين الخواص السطحية للحديد الزهر الرمادي، وذلك باستخدام جهاز Nd : YAG ليزر بطول موجي nm(1064 (، البعد البؤري cm( 5 ,10,18)، وامد النبظة ns (10). استخدمت طريقة الانصهار السطحي بالليزر في تصليد العينات، الى | In this thesis , the effect of laser parameters is used for perfection of the surface characteristics for gray cast iron , using pulsed Nd : YAG laser with wavelength of (1064nm ).The laser surface glazing and shocking methods have been used in hardening the specimens , besides using the laser energy in treatment of (1.2 J) , pulse duration (10 ns), with different focal length of (5,10,18) cm and used the (air ,water , DMSO) as a active medium. In laser surface engineering the micro hardness, roughness and wear rate examinations deliberated before and after laser treatment. The effect of laser parameters includes : The effect of the pulse repetition rate (P.R.R) , the result shows , thevalue of the micro hardness of work pieces reduced but the variation in the value hardness decreased. For the effect of the medium used (air, water, DMSO) it was found with increasing the water and DMSO high the value of the micro hardness of work piece increased and value of the (loss of weight , wear rate, surface roughness ) reduced. After treatment by laser the amount of loss in weight is less than the loss of weight with the base metal (before the treatment) , so the results reveal an improvement in wear rate after treatment by laser. And for the effect of overlapping technique ,it was found that the best percentage for overlapping technique ratio is 50% for the selected laser energy. The value of micro hardness increased by moving away from the center of the laser strike on the work piece.

الحماية من التاكل لقواعد الاعمدة الكهربائية في الترب ذات المقاومية المنخفضة == Corrosion Protection of Electrical Bar Stands In Low Resistivity Soil

اسم المؤلف: اياد نصيف جاسم
اسم المشرف: سامي ابراهيم جعفر الربيعي
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: يستخدم الفولاذ المغلون في تصنيع الاعمدة الكهربائية لامتلاكه خواص ميكانيكية جيدة ومقاومة تاكل عالية. وتحت الظروف الاعتيادية يعاني العمود من التاكل بعد عدة سنوات من الخدمة.يصنع عمود الكهرباء من فولاذ St - 52 والمطابق للمواصفة DIN الالمانية ويتالف من ثلاثة | Galvanized steel is used in electrical poles because of the good combination of its mechanical properties and the corrosion resistance. Under normal conditions, electrical pole suffered from corrosion after some years in service. Electrical poles, which were made according to Germany standard DIN st.52, consist of three parts; the upper, mid and lower part. This study focuses on the last part because the surrounding soil of electrical pole is more corrosive than the atmospheric environment, which surrounds to other two parts of the electrical pole. Soil resistivity is the one variable that has the greatest influence on corrosion rate. Electrical poles which at buried in low resistivity soils will generally be anode, whereas electrical poles buried in adjacent high resistivity soils will generally low corrosion.The electrolyte in this work was prepared according to the values of Iraqi soil resistivity. Sodium chloride (NaCl) was used in different concentrations of (2, 2.5, 3 and 3.5) wt. %, which are equivalent to 27, 24, 20 and 18 ohm.cm. Two methods were used in this work in order to improve corrosion resistance, the first method galvanizing process in different thicknesses (80, 90,100,110,120 and130) µm and the second method is coating by different types of Iraqi paints (D - 5547) with hardener (H - 1457)and(G - 5532,G - 5533,D - 5542) with hardener(H - 5533) The corrosion rate and corrosion potential of steel increases and decreases with the increase in NaCl wt.% concentration respectively. Corrosion rates (mpy) with coating thickness are achieved as a function of environment in different soil resistivities. The more corrosion resistance occurs at 120 µm galvanized layer. Micro cracks appear at 130 µm galvanized thickness.In this work, two mixed ratios of paint and hardener were used. These ratios are 2 : 1 and 1 : 1. Paint with mixing ratio equal to 2 : 1 of G - 5532 + G 5533and mixing ratio 1 : 1 D 5542 with hardener 5530 gave the more corrosion resistance.The coating thickness has a direct influence on the performance or life of the electrical pole. As the thickness of galvanized layer increases, the life of protection increases until 120 µm. The life of a zinc coating is a linear function of coating weight for any specific environment. The efficiency of coated electrical pole either by galvanization or paint process was a proximately between 94% to 97% and 98% to 99.6% respectively.

سلوك المواد فائقة اللدونة ذات البنية المجهرية الناعمة لسبيكة المغنيسيوم نوع AZ31B والمشكلة بواسطة التشكيل العالي الانفعال == Superplastic Behavior of Fine Grained AZ31B Magnesium Alloy Processed By Severe Plastic Deformation

اسم المؤلف: زياد طارق عبد الوهاب
اسم المشرف: ازل رفعت اسماعيل
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Superplastic properties and microstructure evolution of commercial AZ31B magnesium alloy processed by two different severe plastic deformation methods Equal Channel Angular Pressing (ECAP) and Equal Channel Angular Rolling) ECAR) were studied. Samples were tested in tension at temperature of 623 K and strain rate ranging from 2.4×10 - 4 1×10 - 2 s - 1. ECAP die with 10 ×10 mm cross section channel, oblique angle of ?=90° and ?=13° was designed to refine the alloy microstructure at temperature of 473 K using route BC. Application of ECAP showed a remarkable grain refinement for AZ31B Mg alloy from 14.1 to 2.1?m after three ECAP passes. Maximum superplastic elongation of 261% was achieved at 623 K and strain rate of 2.45×10 - 4 s - 1. The measured strain rate sensitivity was m = 0.33 demonstrating that viscous glide control creep was the dominant deformation mechanism. In most investigation used ECAR process, the die temperature was set to room temperature, in order to avoid cracking intermediate annealing was used for AZ31B Mg alloy which has poor formability at room temperature. This is caused by a lack of active slip systems, especially in the <c+a> direction. However, in this study a special isothermal ECAR die capable of operating without intermediate annealing was used to process AZ31B Mg alloy. The ECAR was carried out at 623 K using a die of ?115 ° channel angle and without rotation. Processing by ECAR showed less effect on the microstructure refinement where the grain size was reduced from 10?m to 4.2?m after six ECAR passes. ECAR increases the yield and ultimate stress and decreases the elongation corresponding to increasing the number of ECAR passes, the as - received material exhibits large amount of superplastic elongation compared to ECAR processed specimens. Therefore superplastic behavior of the AZ31B magnesium alloy was evaluated at temperatures 623 K and strain rate ranging from 7.8×10 - 4 s - 1? 1×10 - 2 s - 1. The test showed that maximum elongation of 367% can be achieved at 623 K and strain rate of 7.8×10 - 4 s - 1. The strain rate sensitivity (m) was evaluated by two different methods, uniaxial tensile test on the basis of the true stress true strain curve and by strain - rate jump test. The results show small differences between the two method) m = 0.42 - 0.45), which demonstrate that the grain boundary sliding (GBS) is the dominant deformation mechanism during superplastic test Keywords : Superplasticity. Severe plastic deformation. AZ31B magnesium alloy.

نظام ذكي لتقييم الخشونة السطحية لعملية تشكيل الصفائح التزايدية == Intelligent Surface Roughness Evaluation System of Ismf Process

اسم المؤلف: اوس خالد ابراهيم
اسم المشرف: وسام كاظم حمدان
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تعد عملية تشكيل الصفائح التزايدية تقنية حديثة نسبيا لتشكيل الصفائح المعدنية والتي توفر امكانية تصنيع اجزاء معقدة الشكل وذلك باستخدام مكائن التفريز المبرمجة (CNC milling machines) بدون الحاجة الى قوالب خاصة لكل منتج والتي تتطلب وقتا طويلا للتصنيع مقارنة مع | Incremental Sheet Metal Forming (ISMF) is a modern sheet metal forming technology which offers the possibility of manufacturing 3D complex parts of thin sheet metals using the CNC milling machine. The surface quality is a very important aspect in any manufacturing process. Therefore, this study focuses on the surface quality of parts produced by single point incremental forming (SPIF) process. As a consequence, the objective of this study is to control the surface roughness by studying five forming factors, namely; (tool diameter, step size, tool shape, rotational speed and slope angle).In order to evaluate the surface quality, practical experiments for forming pyramid like shapes have been carried out on sheets of aluminum AA1050 with thickness 0.9 mm. As a result, two Adaptive Neuro - Fuzzy Inference systems (ANFISs) are conducted for predicting the surface roughness. The first system depends on the five forming factors as a direct contact estimation method while the second system utilizes contactless parameters (average gray level, standard deviation and mean frequency) that are extracted from the products images using a vision system as a contactless prediction method. A third model is developed using Sugeno Fuzzy Inference System (SFIS) for the evaluation of forming factors by which the surface roughness for a certain slope angle is obtained.Both quantitative and qualitative assessments have been used to explore the effects of the five forming factors on surface quality of parts produced by SPIF process. The ANOVA and MEP results show that the incremental step size and the forming tool shape are the most important factors affecting the surface roughness. These two factors are directly and inversely proportional to the surface roughness respectively. The maximum and minimum surface roughness, which is achieved from all the 24 experiments is (Ra = 4.3 & Ra = 0.18 µm) respectively. As a result, a surface with roughness smaller than the initial roughness of the sheet (0.27 µm) has been obtained. The qualitative assessment reveals that the surface roughness tends to increase towards the part deep.It can be concluded that the image based estimation of roughness using ANFIS is superior in terms of prediction accuracy. This vision system can achieve (97.856%) testing prediction accuracy compared to (85.799%) that is reached by the direct contact estimation of roughness. Conclusions also show that the vision system is capable of predicting the surface roughness of a hyperboloid part as a non - linear shape with prediction deviation (14.411%), thus enabling to evaluate the surface quality of complex parts that cannot be measured by the stylus. It can also be concluded that the SFIS is a successful approach for estimating the forming factors by which the surface roughness for a particular slope angle is obtained.

متغيرات اللحام المثلى بالقوس الكهربائي المغمور باستخدام طريقة تاكوشي == Optimizing of Submerged Arc Welding Parameters Using Taguchi Method

اسم المؤلف: هشام جواد كاظم
اسم المشرف: احمد علي اكبر اكبر
السنة: 2014
الموضوع الدقيق: هندسة المعادن
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: اللحام بالقوس الكهربائي المغمور غالبا مايستخدم في الصناعات الثقيلة. يستخدم في هذا النوع من اللحام سلك لحام مستمر يكون معدنن الملئ. االقوس يكون مغمور في مساعد الصهر والذي يتم تغذيته من خلال انبوب في حاوية اعلى سلك اللحام الذي يغذى باستمرار. مساعد الصهر يع | Submerged arc welding (SAW) is often used for heavy industries. The SAW process employs a continuous bare wire electrode that is consumed to produce filler, the arc is submerged in the flux, and the flux is supplied through a funnel located ahead of the filler wire which is fed continuously from a hopper, the flux contributes to deoxidize the base metal, and protect the molten weld metal from atmospheric contaminants In order to achieve best weld quality and good mechanical properties in manufacturing industries which need to be optimized. Selection of appropriate SAW parameters is essential to ensure a predictable weld bead which is important for obtaining high quality welding.Manufacturing industries and training centers often face the problem of selecting appropriate or optimum combinations of input welding parameters for achieving the required weld quality. Three input parameters of SAW were used to weld the steel plates, and four levels for each parameter, and three output response variables were used The experimental work consists of welding of sixteen low carbon steel plates of (AISI 1005) specimen measured 300 mm × 50 mm × 12 mm were submerged arc welded using welding currents (280, 340, 400, 460) amp, voltage (26, 29, 32, 35) volt and welding speeds (3.3, 5, 6.6, 8.3) mm/s This work details the application of Taguchi design to determine the optimal SAW parameters. An effort has been made to study the effect of SAW process parameters (current I, voltage V, speed S) on the bead geometry dimensions (depth of penetration P, bead width W, heat affected zone width w).Signal to noise ratios are computed to determine the optimum parameters. Statistical models have been developed based on multiply regression analysis relating the bead geometry with process parameters. The adequacy and significance of the models were checked by using ANOVA technique, also the models are validated using normal probability plot, and residual versus fit plots.The models were employed easily in form of executed program designed by using Visual Basic 6 software. The objective of such models and designed program is to predict weld bead geometry which enables selecting the desired weld parameters and select the weld bead dimensions. The effect of SAW parameters on heat affected zone and weld metal hardness also has been studied by means of hardness measurements, and grain size measurement using intercept method. Main and interaction effects of the process parameters on bead geometry are presented graphically. The experimental results were analyzed by using Minitab 16 software.It was found that current (280 to 460) amp causes increase in depth of penetration from (1.742 to 3.752) mm and HAZ width (1.222 to 1.512) mm. Bead width increases from (10.99 to 13.13) mm with increase in voltage from (26 to 35) volt and decreases from (12.61 - 11.80) mm with increase in welding speed from (3.3 to 8.3) mm/s. The welding speed and voltage do not affect appreciably the depth of penetration. Also change in weld speed reduces the width of the HAZ from (1.462 to 1.295) mm. The hardness of HAZ reaches maximum value 122.39 HV at the center of HAZ and decreases gradually toward the BM 109.22 HV; also it was found that the executed program is a useful tool used to predict weld bead geometry dimensions from welding parameters for SAW process.

التفريز المبرمج باستخدام ملفات STL == Cnc Milling Using Stl Files

اسم المؤلف: نادية سامي حسن
اسم المشرف: ليث عبد الله محمد
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تعد ملفات (STL) من الملفات المهمة في برامج الرسم والتصميم المعان بالحاسوب (CAD) والشائعة الاستخدام حاليا في النمذجة السريعة وانظمة التصنيع المعان بالحاسوب (CAM). يتناول هذا البحث اقتراح وتطوير خوارزميات لقراءة ملفات (STL) واستخلاص السمات الهندسية اللازم | Stereolithography (STL) files are considered very important files in both computer aided drawing and design (CAD) programs and are commonly used now days in both rapid prototyping and computer aided manufacturing (CAM) systems.This thesis proposes and develops algorithms to read (STL) files and extract engineering entities required in CNC milling processes. The proposed algorithms are dependent on some mathematical modeling and manipulations of the engineering model by slicing an (STL) file to many slices and then building the required algorithms to adopt these slices to generate CNC machining paths as G - Code.The proposed system in this work is divided to three parts, in the first part of this thesis an algorithm is proposed to extract engineering object entities to some proposed models based on their (STL) files using Matlab program. The proposed models include cube, cylinder, dome, cone and cavity models. In the second part of this thesis, a slicing algorithm is proposed to enable the slices along the proposed models z - axis to find and navigate the required manufacturing data. UGS CAM program was used also to generate the tool paths and to simulate the machining process and then generate NC part program of the proposed objects (G - Code). The machining process was achieved using 3 - axis CNC milling machine, at spindle speed of (700 rpm) and feed rate (60 mm/min).Finally, the third part of this thesis includes comparing results produced based on both (STL) and (UGS), to achieve the required aim by experimentally comparing both objects surface roughness and evaluate their geometrical variations.According to the experimental results, the objects produced using STL models are clearly have rough surfaces compared with the surfaces produced by UGS with average percentage of 13µm, and according to the geometrical variations experiments, CAD readings are in good agreement with experimental results and confirm the validity of the proposed approach with 4.5mm of shape error.

دراسة مقارنة بين T - spline وNURBS في النمذجة والتشغيل باستخدام ماكنة التفريز المبرمجة == Comparison Study of T - Spline And NURBS In Modeling And Machining Using CNC Milling Machine

اسم المؤلف: مهند مصدق جعفر
اسم المشرف: ليث عبد الله محمد
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: نمذجة السطوح باستخدام تقنية الـ (T - spline ) تعد من اهم الوسائل المتسخدمة الان في التصميم المعان بالحاسوب (CAD).يهدف البحث الى زيادة الانتاجية من المنتجات المعقدة من خلال تعزيز عملية النمذجة السطحية للمنتج وتعزيز التصنيع باستخدام T - SPLINE للنمذجة السط | Surface modeling utilizing T - spline technique is one of the most important tool now in computer aided design (CAD).ThisThesisaims to increase the productivity of complicated products through enhancing the process of product surface modeling and manufacturing by using T - spline for surface modeling. This method provides the designer with many powerful tools to add details only where necessary on the CAD modeling, create non - rectangular topology of the surface, easily edit complex freeform models, and besides maintaining NURBS (non - uniform rational B - splines) compatibility of the model.ThisThesisuses T - spline for surface modeling and compare it with NURBS modeling to get the best modeling points between the two methods. The comparison will be through surface analysis and manufacturing process.ThisThesisincludes design of two types of models : convex model (bicycle seat) and concave model (longitudinal section of the bottle) for each T - spline surface and NURBS surface using Rhinoceros 5.0 software which has been transformed to UG - NX8.5 software to get the machining process simulation and G - code programs for the models. The models have been machined using 3 - axis vertical CNC machine (C - tek) type.Finally, analysis of surfaces (Environment Map analysis, Zebra analysis, Naked Edges analysis, Gaussian Curvature analysis, data structure analysis, Draft Angle analysis) by Rhinoceros 5.0 software and measurement of the roughness by Pocket Surf equipment and measurement runtime for machining by timer, shows that the T - Splines surfaces typically have (50 - 70%) less geometric data structure [ surfaces , 3d curve , 2d curves , vertices , edges , trims , loops , faces ] than the equivalent NURBS surface, inEnvironment Map analysis, the image of T - Spline surface for the models is reflected moreclearly than a NURBS surface, in Naked Edges analysis, the T - Spline surface for the models has a number of naked edge less than the NURBS surface, in measurement runtime for machining (roughing and finishing), the T - spline surface for the bicycle seat model is machined in (16 minutes) less than machining the NURBS surface, and the T - Spline surface for the longitudinal section of the bottle model is machined in (10 minutes) less than machining the NURBS surface. In measurement of roughness, the T - Spline surface for the bicycle seat model has (2.4861 µm) average (Ra) for patches measured roughness average (Ra), and the NURBS surface has (4.9216 µm) average (Ra) for patches measured roughness average (Ra).

تحليل مسار العدة في عملية التشكيل التزايدية للصفائح المعدنية == Analysis of Tool Path In Incremental Sheet Metal Forming Process

اسم المؤلف: ميثم سعد علي
اسم المشرف: وسام كاظم حمدان
السنة: 2014
الموضوع الدقيق: هندسة الانتاج
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: التشكيل التزايدي للصفائح المعدنية هو عملية مرنة للغاية ومتعددة الاستعمالات للتصنيع السريع لاجزاء الصفائح المعدنيه المعقدة حيث تمتلك امكانية التكيف بامتياز مع انظمة التحكم الرقمي بالحاسوب (مكائن التفريز المبرمج CNC) من خلال السيطرة المباشرة على بيانات CAD | Incremental sheet forming (ISMF) is a highly versatile and flexible process for rapid manufacturing of complex sheet metal parts. It has excellent adaptability to computer numerical control (CNC) systems through direct control of CAD data, minimizing the use of specialized tooling and presses. A sheet of metal is formed by a progression of localized plastic deformation using simple forming tool controlled by a CNC machine - tool. The aim of the presented thesis is to investigate the feasibility of incrementally forming of 3D complex shape (like automotive heat shield shape) and the solar cooker shape by Single Point Incremental Forming process without using a dedicated die depending on different tool paths. Six different forming tool paths (unidirectional ZLVTP, bidirectional ZLVTP, FPRTP, ZGZTP, BSLTP and HSLTP) were generated byUnigraphics - NX8 (UGS - NX8) programing system and applied to realize solar cooker shape and automotive heat shield shape. The feasibility investigation and development of automotive heat shield shape is based on three control factors are tool path type, forming tool head shape and the Z - increment (vertical pitch). For each of these factors, levels were tested. The tool head shape and vertical pitch contain their both on two levels while the tool path type on six levels. Hence, 24 experiments applied to realize automotive heat shield shape based on a full factorial design of experiments, and 6 experiments applied to realize solar cooker shape. Hybrid tool paths are tested to explore the applicability these paths in ISMF process. This thesis discussed the impact of tool paths types and other control factors (tool shape and vertical pitch) on the three different quality characteristic namely geometrical accuracy, thickness variation and forming time. The significant of the control factors are explored using two statistical methods are analysis of variance ANOVA and main effect plot. All experiments were carried out on sheets of Aluminum Alloy (AL1070) with thickness 1.5 mm by using 3axis CNC machine. The CNC machine and dial gauge are used to measure dimensional accuracy and final thickness of formed parts respectively. Depending on the results of this work, Helical - Streamline tool path (HSLTP) and follow periphery tool path (FPRTP) are achieved higher geometrical accuracy when forming the solar cooker shape and the automotive heat shield shape respectively. On the other hand, Z Level profile tool path (ZLVTP) is the best tool path to achieve homogeneous thickness distribution and minimum forming time of formed parts. Hybrid tool paths are undesirable in incremental sheet metal forming. The ANOVA results show that all control factors have influence on the accuracy, especially the tool path type. The tool shape and vertical pitch have no influence on the thickness of the formed parts. But, the vertical pitch has major effects on the forming time and accuracy. In contrast, the tool path shape has a great influence on the process implementation.
1 ... 103 104 105 106 107 ... 202