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محزز الليف البصري نوع براغ لتحسس الحرارة والضغط FIBER BRAGG GRATING FOR TEMPERATURE AND PRESSURE SENSING

اسم المؤلف: فهد محمد عبد الحسين
اسم المشرف: تحرير صفاء منصور
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Nowadays, the modern trends in optical sensing are to build simultaneous measurements sensors. In this work two schemes for simultaneous measurements sensors are presented. The first one is with dual FBGs peaks. Every FBG acts as sensing head. The first peak was used for temperature sensing and the obtained sensitivity is 10 pm/˚C and the second peak was used for temperature and pressure measurements with sensitivities 9.2 pm/˚C and 67 pm/ bar for temperature and pressure respectively.The other scheme consists of two sensing heads fabricated in the lab. The first sensing head is the Fabry - Perot interferometer which was used for load and strain measurements by controlling the size of its cavity reached to minimum value in micro scale (30). The sensitivity was increased to 4.07 nm/ N and 5.11 pm/ μɛ for load and strain respectively. This sensitivity for load is the highest that was recorded by micro cavity where previous works were reached to 1.37 nm/N. The second sensing head made by inscribing Bragg gratings inside the core of All Solid Photonic Band - Gap fiber toenhance its sensitivity that reached to 13.7 pm/˚C and 0.7 pm/μɛ for temperature and strain respectively which is more sensitive than previous works of our group in the institute that reached to 10 pm/˚C and 0.66 pm/μɛ for temperature and strain respectively. The obtained temperature sensitivity for the Bragg gratings is higher than previous work for Bragg gratings inscribed on All Solid Photonic Band - Gap Fiber where it was 12.04 pm/˚C.Strain sensitivities were almost the same.

التحقق عمليا من بروتوكول البينغ بونغ

اسم المؤلف: علاء جبار جمعة
اسم المشرف: شيلان خسرو توفيق
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Quantum cryptography uses basic laws of quantum physics to guarantee secure key exchange. The key can be used with unprecedented confidence in any classic cryptographic protocol, where it increases the security to the maximum achievable value. The goal of this work is to encrypt the message directly without need to generate the secure key by using the modified Ping - Pong Protocol. A quantum cryptography system based on Modified Ping - Pong Protocol was designed and implemented for the first time. A polarization - entangled photons were generated by a source using PPKTP crystal inside a polarization Sagnac interferometer at telecom wavelength 1550 nm and a fiber length of 15 Km. In this experiment, Bob prepares entangled photons, sends one photon to Alice by optical fiber to perform one out of four operators according to the message. The modulated photon is sent back to Bob. Then the Bell’s state measurement is applied to extract the message according to the Alice’s coding. The HOM - dip of the two - photon interference was verified to guarantee perfect system performance. The final results showed the switching between the Bell’s states, |????+⟩ and |????−⟩ as the phase of the phase modulator was changed by Alice achieving an acceptable coincidence count of about 625 counts per 30s. These results proves also two photon interference needed to test Bell’s enquality.

الليف البلوري الفوتوني لاستشعار المجال المغناطيسي Photonic crystal fiber magnetic sensor

اسم المؤلف: احمد عدنان محمد
اسم المشرف: عبد الهادي مطشر الجنابي
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Photonic crystal fiber (PCF) is widely used for sensing applications. In this work, magnetic sensor based on solid core - PCFs for sensing magnetic field was presented. The general structure of the sensor applied is by splicing short lengths of PCF (LMA - 10) with conventional single mode fiber (SMF - 28) in one side and using free space connector from other side. A laser diode with different wavelengths (850, 1060 and 1300 nm) has been used as a light source, where a high sensitive optical spectrum analyzer (OSA) was used to monitor and record the transmitted/reflected spectra.The present work demonstrates the results of the infiltration of the air holes for the PCFs by fluids instead of air. For magnetic sensing, the magnetic fluids being used were prepared and standard ????????3????4 to infiltrate the air holes for the solid core PCF (LMA - 10) which leads to change in the effective refractive index of the PCF, which in turn affects the transmission of the laser inside the PCF due to the value of the refractive indices of the magnetic fluids. The experiments show that the power of transmissionspectrum of the laser had decreased after infiltration without any change in central wavelength of the laser diode the reason is that after PCF air holes infiltration, the effective refractive index has been changed but still within total internal reflectionwhich leads to loss of some fundamental modes, in turn leads to decrease the power of transmission spectrum. The decrease of the transmitted power in the case of standard has been higher than it in the case of prepared ????????3????4 because of the differencein concentration between standard and prepared magnetic fluids. The power of transmission spectrum after PCF infiltration will be increased with increasing magnetic field. Higher sensitivity has been obtained that reached 5.809 nW/mT which consideredhigher than previously published works on PCF magnetic sensors.

التحقق من تاثير عدم استقرارية بلاتو - رايلي في عملية سحب ليف شبه المواد انديوم - بوليمر Investigation of the influence of the Plateau - Rayleigh instability in fibre drawn indium - PMMA metamaterial

اسم المؤلف: احمد عبد الكريم علي
اسم المشرف: عبد الهادي مطشر الجنابي
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: دكتوراه
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Metamaterial is a synthetic composite material with a structure such that it exhibits properties not usually found in natural materials. Fibre drawing method has been used in producing Poly - methyl methacrylate (PMMA) - indium wires metamaterials. PMMA and indium are having relatively the same glass transition temperature making them suitable for co - drawing. The fiber filaments must be drawn to smaller diameters to shift the metamaterials response to higher frequency. At these dimensions the metal filaments inside the fiber become unstable and break - up at random intervals. This instability is due to a phenomenon known as the Plateau - Rayleigh InstabilityWell known Tomotika model for the growth in the varicosity in the surface of fluid extended inside another fluid was modified to describe the fluctuations (instability) of inner core diameter for metamaterials drawing inside radiative furnace. Modified Tomotika model was used to investigate the instability growth of the indium wire diameter produced by co - drawing of indium metal embedded in a PMMA polymer.The critical parameter for the wire breaks is the wavelength of perturbations. A MATLAB model was used to describe a small drawing ratio (neglecting the wavelength of fluctuations effect). The experimental and modeling results are almost match when a very small temperature variation occurred. So the observed fluctuations in diameter can be reconciled with the Plateau - Rayleigh instability.For larger fluctuations (large drawing ratio) the wavelength of fluctuations was analyzed and sequential breakup on different length scales was observed. We infer limits to wire dimensions that can beachieved using the chosen material system and identify a path for extending drawing methods to fabricate smaller wires.Finally, simulation for deep subwavelength wave propagation inside wire metamaterials depending on the unit cell manipulation was performed. CST microwave studio software had been used to simulate wave propagation inside linear and 90o corner waveguide as well as equal arms beam splitter (50/50). It’s applicable to waveguiding 40cm wavelength in about 2.4 cm waveguide.

لحام ليزر الاندي ياك لمعادن غير متشابهة تيتانيوم رتبة 2 مع سبيكة المنيوم - O3105 Dissimilar Nd : YAG Laser Welding of Grade 2 Titanium to 3105 - O Aluminum Alloy

اسم المؤلف: عبير احمد شهاب العبيدي
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: دكتوراه
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: التيتانيوم والالمنيوم مواد تلقى اهتمام تقني في الصناعات الالية والفضائية والمتحسس الذكي.التحديات التي تواجه لحامهم هي نتيجة للاختلاف الكبير في المواصفات الثرموفيزيائية والميكانيكية, اضافة الى الذوبانية المحدودة لكل معدن في الاخر,لذلك لحامهم باستعمال الليزرسيقلل تكوين الا طوار المعدنية الضارة لما كانت منطقة اللحام نفسها ضيقة .في هذا العمل قدم شكل خاص من اللحام الليزري النقطي لربط تيتانيوم رتبة 2 تراكبيا مع سبيكة المنيوم 3105 - O باسماك 1,0.5 ملم على التوالي, من خلال لحام درز دائري, لبق التصميم يستعمل نبضات ليزر متعاقبة ادت الى لحام شبيه للحام الليزري النقطي .لهذه الدراسة كانت معاملات لحام الليزر كالاتي : طاقة النبضة 11جول, مدة النبضة 6 ملي ثانية, تردد النبض 20هرتز,تدفق غاز الاركون 20 لتر/دقيقة وسرعة اللحام (4 - 6.67) ملم/ثانية.لقد لوحظ ان تاثيرسرعة اللحام كان الاقوى على الحرارة الداخلة لمنطقة اللحام حيث سرعة لحام 4 ملم /ثا (76%عامل تداخل النبضات), قد ادت الى افضل امتصاص لطاقة الليزر واكثر تجانس وعرض للمساحة المنصهرة عند منطقة تداخل ,Ti - Alلذلك تم الحصول على 70MPa مقاومة وصلة اللحام. اظهر فحص منطقة وصلة اللحام باستخدام المجهر الماسح الالكتروني SEM, مقياس تشتت طاقة الاشعة السينية EDS ومقياس انحراف الاشعة السينية,XRD تكون الا طوار المعدنية الضارة. المنطقة المنصهرة للتيتانيوم قرب منطقة تداخل Ti - Alضمت طور.Ti3Al الشقوق لوحظت في منطقة الالمنيوم المنصهرة قرب منطقة التداخل ,Ti - Alنتيجة الانحدار العالي في الخواص الميكانيكية والثرموفيزيائية. من اجل التقليل من تكون الا طوار المعدنية الضارة وتخفيف الانحدار العالي في الخواص . الثرموفيزيائية والميكانيكية, اربعة انواع مختلفة من الحشوات المعدنية (Al - 5Si, Al - 12Si - 2.5Mg, pure Nb and Al - 0.2Sc - 0.36Zr) مع ثلاثة اسماك مختلفة لكل حشوة قد حضرت في هذا العمل. حشوة Al - 5Si كان لها تاثير ايجابي على مقاومة وصلة اللحام حيث ان Siقلل التاثير الضار للاطوار المعدنية الضارة من خلال تعويض ذرات Al في Ti3Al لذلك فان مقاومة الوصلةزادت الى MPa80بدل MPa70.حشوة Al - 12Si - 2.5Mg قد حسنت مقاومة الوصلة الىMPa87 متجاوزة بذلك مقاومة القصMPa82 لترابط المعدن الاساس Al. نتيجة درجة اانصهاره العالية, حشوة النيبيوم النقي Nb منعت لحام صفيحة Al السفلى, لذلك هذه الحشوة كانت غيرمناسبة للا ستعمال وفق شروط اللحام لهذا العمل. لقد كان للحشوة الجديدة Al - 0.2Sc - 0.36Zr التي استعملت لاول مرة من خلال هذا العمل تاثير ايجابي جدا على قوة ترابط وصلة اللحام MPa103 حيث ان الكسر حدث من المعدن الاساس Al وليس من الوصلةخلال عملية الاختبار. بالمقارنة مع مقاومة التاكل لمعدن التيتانيوم الاساس, اظهرت الوصلات بدون استعمال حشوة وباستعمال حشوة Al - 0.2Sc - 0.36Zr نقصان بمعدل التاكل ب %51 و%72 بالتعاقب بينما اظهرت الوصلات باستعمال حشوات Al - 5Si,Al - 12Si - 2.5Mg زيادة بمعدل التاكل ب % 80 و%68 بالتعاقب. | Materials titanium and aluminum are of technological interest in automotive, aerospace and smart sensor industries. The challenges for welding them result from the large difference in thermophysical and mechanical properties, besides limited solubility of each metal in other. Thus welding them using laser, will reduce intermetallic phases (IMP) formation to acceptable limits, since the weld itself is narrow.In the present work a special form of laser spot welding is introduced to joint overlapped titanium Ti Grade 2 to 3105 - O aluminum alloy, with 1 and 0.5 mm thicknesses respectively. A welding tactile seam tracking design using following pulses that result to a circular seam, leads to spot like shape laser welding. For this study, laser welding parameters were : pulse energy 11 J; pulse duration 6ms; pulse frequency 20Hz; argon gas flow rate 20 l/m and welding speed (4 - 6.7) mm/s. Welding speed was observed to have the strongest effect on heat input, where 4 mm/s (76% overlapping) speed has led to better energy absorption and wider more uniform melted area at Ti - Al interface, thus 70 MPa joint strength was obtained. Examination of the joint region using scanning electron microscopy (SEM), energy dispersive X - ray spectrometry (EDS) and X - ray diffraction (XRD) showed the formation of different IMP in the Ti - Al welding zone. Ti fusion zone (FZ) near the interface was mainly containing Ti3Al. Crakes were observed in Al (FZ) near the interface as a result of mechanical and thermo physical properties gradient. Inorder to reduce IMP formation and relaxes the high gradient in thermophysical and mechanical properties in the welding zone, four fillers metals (Al - 5Si, Al - 12Si - 2.5Mg, pure Nb and Al - 0.2Sc - 0.36Zr), with three different thicknesses for each filler, were prepared. Al - 5Si filler has positive effect on the joint strength where Si has reduced the IMP harmful effect via replacing Al atoms substitutionaly in TiAl3 at the interface, thus joint strength was increased to 80MPa instead of 70MPa. Al - 12Si - 2.5Mg filler has improved the joint strength to 87MPa where the shear strength of Al base metal of 82MPa was exceeded. Due to its high melting point pure Nb filler prevented penetration of bottom Al sheet, thus it was unsuitable to use for the present work conditions. A new Al - 0.2Sc - 0.36Zr filler was used for the first time in the present work and has very positive impact to the joint strength 103MPa, where the joint has fractured from Al base metal. In comparison to the corrosion rate of Ti base metal, joints without using filler and with the new Al - 0.2Sc - 0.36Zr filler metal, have decreased the corrosion rate by 51% and 72% respectively, while joints with Al - 5Si and Al - 12Si - 2.5Mg filler metals, have increased the corrosion rate by 68% and 80% respectively.

ليزر الدايود (970 نانوميتر) في كشف الزرعة السنية في المرحلة الثانية مقارنة مع الطريقة الجراحية التقليدية في الجسم الحي 970 nm Diode Laser In Second Stage Dental Implant Exposure Comparative Study With Conventional Surgical Method .In vivo Study

اسم المؤلف: سلا علي حمدي
اسم المشرف: حسين علي جواد
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: ماجستير
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تعد زراعة الاسنان التطور الاكبر لطب الاسنان اذ انها تعالج فقدان الاسنان دون التاثيرعلى الاسنان الموجودة لتعويض السن المفقود.تقسم عملية الزرع بشكل عام الى مرحلتين : المرحلة الاولى هي العملية التي يتم فيهاغرس الزرعة السنية داخل عظم الفك وتركها مطمورة تحت اللثة لمدة 3 - 6 اشهر لحين اكتمال التحام العظم بالزرعة والمرحلة الثانية وتشمل كشف الزرعة المطمورة وازالة نسيج اللثة جراحيا .الاهداف تقييم كفاءة القطع الجراحي للدايود ليزر ذو الطول الموجي 970نانوميتر ومقارنته مع القطع الجراحي التقليدي باستخدام الشفرة في عملية كشف الزراعة السنية اثناء المرحلة الثانية من عملية الزراعة من خلال كمية المخدر الموضعي المطلوبة ,وقف النزيف,الوقت المستغرق لاجراء العملية ,الم ما بعد الجراحة واخيرا الوقت المناسب لاخذ الطبعة من اجل اكمال الخطوات المختبرية لصناعة الاسنان المفقودة. اجريت هذه الدراسة في قسم زراعة الاسنان /مركزالعلوية التخصصي لطب الاسنان للفترة من كانون الاول للعام 2013 لغاية تشرين الاول 2014 ، 50 مريض يحتاجون الى كشف الزرعة المطمورة قسموا الى مجموعتين المجموعة الاولى والتي تىشمل 24مريض تم استخدام الشفرة الجراحية رقم15والمخدر الموضعي تقنية التسرب والمجموعة الثانية المتكونة من26 مريض تم كشف الزرعة باستخدام ليزر الدايود (سيرو ليزر ادفانس,سرونا ,المانيا) وبقوة مقدارها 3واط في الوضع المستمر وبتماس مع نهاية الفايبر قياس320مايكروميتروالمخدر الموضوع بتقنية البخ.كفاءة الليزر كانت عالية في قطع نسيج اللثة وبالمقارنة بين المجموعتين كان هناك فرق معنوي احصائي عالي في كمية المخدر الموضعي المطلوبة وطريقة التخدير ,متوسط الزمن المستغرق لاجراء العملية بين المجموعتين, الالم ما بعد العملية واخيرا الوقت المناسب لاخذ الطبعة لصالح مجموعة الليزر.استخدام 970 نانوميتر وبقوة 3واط دايود ليزر في كشف الزرعة المطمورة له فوائد عديدةمنها عدم الحاجة لاستخدام التخدير بتقنية التسرب,راحة الطبيب والمرض في ان واحد من حيث الوقت المستغرق وسهولة التطبيق وعدم شعور المريض بالالم وامكانية اخذ الطبعة في وقت مبكر حيث يمكن ان يتم ذلك بعد عملية الليزر مباشرة . | Following the placement of a dental implant and its integration into the osseous substrate, the current method of treatment is to surgically uncover the implant, wait for the tissue to heal, and then proceed with impressions and fabrication of the restoration. The second - stage surgery of submerged implants can be performed with a scalpel or by laser . This prospective study was designed to assess dental implant uncovering by 970 nm diode laser and to compare its performance with traditional cold scalpel surgery. Fifty patients with a completely osseointegrated implants participated in this study. Patients were divided into two groups. For the study group, second - stage implant surgery was done with a 970 nm diode laser in a 3W power . For the control group, the implants were exposed with a surgical blade. Certain parameters were used for evaluation of the two techniques. The use of the diode laser reduce the need for injected local anesthesia; there was a significant difference between the two groups regarding the need for anesthesia , duration of surgery, postoperative pain, time for healing and taking the impression(P < 0.001). The 970 nm with 3W diode laser can be used effectively for second - stage implant surgery, providing both the dentist and the patient with additional advantages over the conventional methods used for implant exposure .Laser cuts tissue precisely without infiltrative anesthesia and with excellent homeostasis . Because of lower amount of tissue destruction with the laser surgery the gingival contours seem tobe stable after laser implant recovery procedure . impressions can be madeimmediately and assuredly with no change in the emergenceprofile by any tissue shrinkage or recession.

الكشف عن البخار الكيميائي بحساسية عالية المستند على مقياس التداخل لليف البلوري الفوتوني Chemical vapor detection with high sensitivity based on Photonic crystal fiber interferometer

اسم المؤلف: رواء كاظم زرزور
اسم المشرف: حنان جعفر طاهر
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: ماجستير
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: استخدمت مقاييس تداخلات الالياف البلورية الفوتونية في العديد من تطبيقات التحسس. في هذا البحث, تم استخدام الالياف البلورية الفوتونية ذو القلب الصلب المستندة على مقياس تداخل ماخزندر, الذي يسلك حساسية عالية لمعامل الانكسار ومختلف المركبات العضوية المتطايرة، من دون الحاجة الى اي مواد قابلة للاختراق. مقياس التداخل المدمجة ,القوية ويتكون من نهاية ليف بصري بلوري ,الليف البصري البلوري مرتبط مع الليف التقليدية ذات النمط المنفرد ((SMF - 28هذا الارتباط يكون باقل خسارة dB(0.19) في منطقة الارتباط فتحات فراغات الليف تنهار كليا, وتسمح بلتهيج واعادة التركيب للانماط القلب والغلاف .وفي منطقة الارتباط الانماط الاساسية لليف البصري التقليدي تبدا بالحيود عندما تدخل الجزء المنهار من منطقة الارتباط لليف البلوري الفوتوني . بسبب الحيود ، يوسع النمط ويسمح لاثارة نمطين رئيسيين في نهاية اليف البصري الفوتوني.الجهاز يعكس الطيف ويظهر نمط تداخل كدالة جيبية التي تظهر ازاحة بالطيف البصري بشكل مختلف عندما تتسل جزيئات المركبات العظوية المتطايرة الى فتحات الليف البصري البلوري. استخدم ليزر دايود كمصدر ضوئي وبطول موجي 1550 nm ، حيث تم استخدام محلل الطيف الضوئي (OSA) الحساس للغاية في رصد وتسجيل الطيف المنعكس. استخدم ثلاثة انواع من السوائل الكيميائية (N - الهكسين، الميثانول وبروبانول)، كل هذه السوائل الكيميائية وابخرتها لها شفافية عالية في منطقة الطيف المرئي والمنطقة تحت الحمراء القريبة. في هذه التجربة، وجدنا افضل زمن الاستجابة لهذا المتحسس هو من (30 - 35) ثانية لكميات قليلة جدا من هذه السوائل، كما تم دراسة تاثير طول المتحسس على قيمة الازاحة للطول الموجي ، تم اختبار خمسة اطوال مختلفة من PCF ذو القلب الصلب70,50,40,30and 20) nm). حدود الكشف في هذا الجهاز تم من خلالها تسجيل ازاحة في الطول الموجي لنسب من ابخرة مواد كيمياوية تصل لغاية (4.4) nm للبخار الهكسان عندما يكون طول رئس المتحسس (20)mm . في هذا العمل, الحد الاقصى للحساسية التي تم الحصول عليها للمركبات العضوية المتطايرة هي mol \15420 nm في بخار الهكسان .وقد تحققت بعض نتائج المحاكاة باستخدم برنامج COMSOL multiphysics ,تم استخدم هذا البرنامج لتصميم الليف البصري البلوري وايجاد توجيه دايود ليزر 1550 nm داخل الليف البصري البلوري عندما يتغير معامل الانكسار نتيجة لدخول ابخرة المركبات العضوية المتطايرة(هكسان, بروبان, وميثان) وملئها لفتحات الليف. نتائج mulyiphsics COMSOL عندما تسلل ابخرة السوائل الى فراغات الليف البلوري الفوتوني بدلا من الهواء. وعندما يتسلل بخار السائل الى PCF ذو النواة الصلبة (LMA - 10) الذي يؤدي الى تغيير في معامل الانكسار الفعال للPCF، والتي بدورها تؤثر على انتقال ليزر داخل PCF بسبب قيمة معاملات الانكسار للمركبات العضوية المتطايرة. ويظهر نتيجة لذلك ان طاقة طيف انتقال الليزر تخفضت بعد تسلل البخار مع التغير في الطول الموجي المركزي لليزر الدايود. | Photonic crystal fiber interferometers are used in many sensing applications. In this work, an in - reflection photonic crystal fiber (PCF) based on Mach - Zehnder (micro - holes collapsing) (MZ) interferometer, which exhibits high sensitivity to different volatile organic compounds (VOCs), without the needing of any permeable material. The interferometer is robust, compact, and consists of a stub photonic crystal fiber of large - mode area, photonic crystal fiber spliced to standard single mode fiber (SMF) (corning - 28), this splicing occurs with optimized splice loss 0.19 dB. In the splice regions the voids of the holey fiber are completely collapsed, which allows the excitation and recombination of core and cladding modes. The device reflection spectrum exhibits a sinusoidal interference pattern which shifts differently when the voids of the PCF are infiltrated with VOC molecules. Laser diode with wavelength 1550nm has been used as a pump light source, where a highly sensitive optical spectrum analyzer (OSA) was used to monitor and record the reflected spectra. Three types of chemical liquids used (N - Hexane, Methanol and Propanol), all of these chemical liquids and their vapor have a high transparency for visible and NIR spectrum. In this experiment, we found the best response time to this sensor is from (30 - 35) sec for very few quantities from these liquids which approximately measured in microliter, also it was studied the effect of the length of the head sensor on the volume of shift of the wave length, five different lengths of solid core PCF (LMA - 10) (70,50,40,30, and 20) mm were tested.The detection limits of our device associated with the maximum shifts of the wave length is 4.4nm for N - Hexane vapour when the length of the head sensor 20mm.In this work, the maximum sensitivity obtained of volatile organic compounds is 15420nm/mol at the vapor of N - Hexane.Some simulation results have been achieved by using the COMSOL mulyiphsics program. It used to design the photonic crystal fiber large - mode area and find the guiding of laser 1550 nm at this fiber when change the refractive index cladding of the photonic crystal fibers by filling the hole of cladding in vapor of (N - Hexane, propanol, methanol) at 1550 nm, The results of the COMSOL mulyiphsics when infiltration of the air holes for the PCF by vapor liquids instead of air, due the change value of the effective refractive indices of the VOCs, the power of the transmission spectrum of laser decreased after infiltration with change in the center wavelength of the laser diode

التحقق عدديا وعمليا من مبادل حراري ذو سائل نانوي في منظومة التبريد والتهوية والتدفئة مع الكشف بالليزر Numerical and Experimental Investigation of a Nanofluid Heat Pipe Heat Exchanger in HVAC System with Laser Detection

اسم المؤلف: ايسر عبد الرزاق الاميري
اسم المشرف: حسين علي جواد زينب فاضل مهدي
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: دكتوراه
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: The improvement of energy saving in heat pipe heat exchanger system was investigated .Theoretical work was done to study the effect of coating with nanomaterials on the thermal performance of HPHE to enhance the energy saving. Temperature distribution and thermal resistance for different nano materials (BN, WC, HFB2, MgO and MOSi2), metal and metal oxide (Ag, Cu, AL, BeO, Al2O3 and CuO) on fins were studied. The maximum enhancement of the thermal performance at the evaporator section in steady state operation condition was (5.072, 5.063, 5.075 and 5.069) for (WC, HFB2, MgO and MOSi2) respectively and (5.829) for (BN) at the same section in transient operation condition while at the same section in steady state operation condition (5.063, 5.064, 5.07, 5.068, 5.075 and 5.076) for (Ag, Cu, AL, BeO, Al2O3 and CuO) respectively was detected. The best nano material for enhancement the thermal performance of HPHE are BN for nanomaterial ,Al for nano metal and CuO for nano metal oxide .The thermal performance of seven thicknesses of CuO coating layers on HPHE fins was also studied. Results showed that the enhancement of the thermal performance is decreasing with the increment of coating thickness at the evaporator section of transient conditions (5.076, 5.075, 5.073, 5.072, 5.070, 5.068 and 5.067) for (10, 25, 50, 75, 100,125and150)μm thicknesses respectively. Experimental work was done to examine the general performance of thermosyphon heat pipe at four concentrations (0.05, 0.2, 0.6 and 1) wt. % of nanofluid. Two CW diode lasers (532,650) nm were used as a detection system to determine the variation of the concentration within the system operation. The results showed that fourteen percent reduction in thermal resistance is detected for 0.05wt.% relative to the DI - water . The shorter time of steady state condition of operation, the higher values of total thermal effectiveness, energy saving and energy balance ratio of HPHE were satisfied at 0.05wt.%. The maximum value of relative powers of 0.05wt% nanofluid concentration is detected compared with the other concentrationsdue to the low density of nanofluid concentration. The start sensing and ending detection powers are (0.1, 1) W respectively of this type of nanofluid.

التوليد والسيطرة على التشويش في اتصالات التردد الراديوي - البصري Chaos Generation and Control in RF - Optical Communications System

اسم المؤلف: اسراء علي ياسين
اسم المشرف: قيس عبد الستار النعيمي
الموضوع العام: علوم الليزر
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: تتناول هذه الاطروحة تنفيذ وتقصي موضوع الاتصالات الضوئية الفوضوية .ونظرا لمتطلبات السرية العالية، تستخدم الاتصالات الضوئية الفوضوية لتشفير الرسائل بين وحدات الارسال والاستقبال.ان الطريقة التي استخدمت للحث على السلوك الفوضوي هي طريقة التغذية المرتدة الضوئي - الالكتروني باستخدام جهاز من محاسن هذا المضمن هو عرض النطاق الترددي ودرجة التعقيد العالية. استند عمل النظام الى طريقة التغذية المرتدة. في هذا النظام، يكون جهاز مذبذب وحدة الارسال مسار مغلق بينما يكون جهاز الاستلام مسار مفتوح يستلم اشارة الفوضى من وحدة الارسال عبر وصلة الالياف الضوئية. تم البحث عمليا في طريقتين لتشفير الرسائل الى اشارة الفوضى. ان هاتين الطريقتين هما التعديل المشوش والتنكر المشوش. لقد بدانا من اختراع نظام الفوضى ودراسة خصائصه وتحديد عناصر السيطرة التي تؤدي الى حالات مختلفة من سلوك النظام. وهكذا تم تقصي الطريق الى الفوضى في مذبذب جهاز الارسال. ولملاحظة سلوك النظام، تم تحديد الرسم المتشعب من خلال تغيير العنصر المتحكم. ان عنصر التحكم هو القدرة البصرية الخارجة من الثنائي الليزري . وجرى بحث التسلسل الزمني وطاقة الطيف واعادة تكوين مساحة الطور. وقد تم بحث موضوع تزامن كلا الطريقتين. وتم الحصول على الرسالة المرسلة في وحدة الارسال من خلال تزامن المذبذب في وحداتي الارسال والاستقبال. وهكذا تم الحصول على الرسالة المستخرجة عند وحدة الاستلام. ان عرض النطاق الترددي لاشارة الفوضى الحاملة هو 200 ميكاهيرتز. وتكون قيمة القدرة الضوئية الخارجة من ثنائي اليزر والذي هو العامل المتحكم في نظامنا هذا في كسب الطوق المرتد في مذبذب الارسال بين (0.8 - 0.9) ملي واط. الرسالة كانت عبارة عن تردد راديوي 100 ميكا هيرتز وقدرة 0 ملي ديسبل. | In this thesis, the chaotic optical communication is implemented and investigated experimentally. Due to the high security requirements, chaotic optical communication is used to encrypt the message between the transmitter and the receiver units. The method which is used to induce chaotic behavior is electro - optical feedback loop by using a Mach - Zehnder modulator. The advantage for this modulator is a high bandwidth and high complexity. The system is a unidirectional feedback loop. In the scheme of unidirectional, the oscillator of the transmitter unit is a closed loop while the oscillator of the receiver unit is an open loop that receives the chaotic signal from the transmitter via an optical fiber link. Two setups were investigated experimentally to encrypt the message to the chaotic carrier signal. These methods are chaos modulation and chaos masking. We have started from creation the chaotic dynamics studied its properties and determined the control parameters that lead to various situations of the behavior of the system. The rout to the chaos for the transmitter oscillator has been investigated. To observe behavior of the system through changing of the control parameter, the bifurcation diagram is plotted. The control parameter is the output optical power of the laser diode. Time series and power spectrum of the time series is extracted by using Fast Fourier Transform FFT. The phase space reconstruction has been examined. The synchronization of two setups has been investigated. The sent message is extracted by the oscillators synchronization in the transmitter unit and the receiver unit. The extracted message has been obtained at the receiver unit. The bandwidth of the chaotic signal is about 200 MHz. The output optical power of the laser diode which is the variable control parameter of our setup in the feedback loop gain of the transmitter oscillator is between (0.8 - 0.9) mW.The message is a radio frequency at 100 MHz with power 0 dBm and is attenuated below this level with the noise level when modulated with the chaotic carrier.

فكرة الحكومة العالمية وتطورات النظام السياسي الدولي Concept Of The World Government And International political System Developments

اسم المؤلف: يسرى كريم محسن العلاق
اسم المشرف: يسرى كريم محسن العلاق
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: he idea or hope of achieving a World Government wasconsidered amongst Philosophers and Advocates of world peace. Beginnings of the concept were found back in global philosophies and religions, where origins for globalism and unity of human race and natural law, formed its first intellectual approach.The idea of a world government was associated with the International Political System, since the Treaty of Westphalia In 1648, Where the Global Government was considered as an alternative to the International Political System, where through it there will be an end to conflict and perpetual war in the international system, As means and procedures that were produced by the international system proved to fail in achieving peace.Although the need for a world government in achieving world peace, establishing justice, And confront oppression and injustice sounds totally logical as a concept, but practically it was found to contradict with the international system On ground; setting the idea in the frame of an unrealistic approach or a kind of Utopia. In other words, conditions were far from favorable for its establishment. On the contrary, centralized nation - states in the international system, its absolute sovereignty, national divisions, and ideological conflicts, As well as the will of major powers to Control and dominate the international system, and seeking self - Interests by looting the world's wealth, controlling vital resources, and absence of peoples' role in international politics. All of these fac tors were considered main reasons preventing the establishment of the world government.The end of the Cold War revealed a major transformation in International Political System, where a set of political, economic, technological and cultural variables have led to a change in the nature of the International Political System. The world has become integrated as a result of the immense technological developments, growing economic globalization, decline of ideological conflict, increasing costs of military forces, As well as the decline in the authorities and functions of the state to manage some sectors at thenational and international levels, for the benefit of the growing roles and functions of other actors in global politics. Alongside the emergence of new global challenges and threats that not only endanger states but humanity as whole.According to what was aforementioned, a necessity for a high global management to deal with global issues and respond to global threats was in urgent need. In other words, what the global system is witnessing of major evolutions and drastic changes, require the establishment of a higher Global Authority or Authorities

اثر البنية الاقتصادية في الثقافة السياسية في العراق بعد عام 2003 Effecting of Economic Structure on Political Culture in Iraq after 2003

اسم المؤلف: احمد حسين والي البدري
اسم المشرف: هشام حكمت عبد الستار العزاوي
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: The present research includes two main comparisons as to take in and assimilate the Iraqi Society in respect to the political culture of economy reality having effect on the culture structure. The latter is a mixture of text , thought and history. Hence , the meaning of Iraqi culture structure expresses about its self in escalating activities ,alienation disorders , and religious or social( worthy things non violations ). The current study indicates the structure of the Iraqi intellectuality and state of that economic structure and activities ensued from it and not the political culture.In every society there would be discrepancy between non - reality and reality; this discrepancy requires to be interpreted and explained for the individuals of the society having the same social symmetry. From hence , it could notice that the Iraqi society suffers from the following : - Attractively in the subject of the economics : it is the existence of huge and diverse resources ,including strategy ( oil and gas ) , human capabilities and others , these resources live pace by pace with its contradictories as poverty , undeveloped economics , infrastructure and culture structure deforming . These phenomena indicate defects that should be scientifically processed , in the way that it could not logically say that there huge wealth sources beside poverty and unemployment ( violence and corruption). - In reality , the depth of democracy could not be achieved unless there should be equity among the citizens; besides, it requires all energy of personal efforts as to get a suitable living state . The economic and social power should be restricted only to elite having known by its production and capability as to get Iraq out of its present state to the right path. - The problem of Iraq is the structure problem where economic, social, cultural and political 's viewpoint should be valuably sought for. The weakness of political culture and its traditions related to its unity that expresses about the history of the state , political system and economic and social development.

وضع الاقليات في الدولة الفيدرالية - ستراتيجيات التعامل وسياسة الاحتواء : دراسة مقارنة بين العراق والهند The Situation of minorities in the federal state : Coping Strategies and Policies of Containment a Comparative Study between Iraq and India

اسم المؤلف: علي جاسم عبد علي عبد الله
اسم المشرف: عامر حسن فياض
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: Those human groups that distinguish it from other citizens were not, have achieved a stable unrivaled referred to Mendez until they have suffered a lot of injustice and oppression, which is still suffering, even in some of the systems developed democracy, that these are distinct from the rest of the community groups dubbed minorities name and that and according to specific criteria applies these groups is consistent with the nature of the name, and it was the closest and most common is the standard numerical these groups, was launched researchers and specialists from several criteria to be called and the possibility of compatibility with the political systems in the countries in which they live and are considered citizens, since citizenship is the rights and duties , he must enjoy those groups full rights and a commitment to full duties, similar to the rest of the citizens of the state, but these rights and duties may encounter complexity depending on the nature of the political system and the extent of the enjoyment of democratic values. In systems where the central state is very strong almost disappear those privacy or even sometimes disappear , whether it be due to deliberate or extreme centralization by which leave no room for such groups to exercise self - rights, such as the use of language and the way of education and practice their own culture which is characterized by which keeps its part to revive that culture and conservation, therefore, we find that minorities in the central states can not full rights to enjoy, but the only commitment to their duties, which in this case has violated one of the pillars of citizenship, namely the rights, and remained live only on the second corner.In spite of the fact that a variety of Federal Regulations (Union treaty and the Union of personal Federation and the Federation of actual, and the confederation), the best one and the most coherent is the Federal Union, which is one of the more regulations efficacy in the management of the issue of minorities, but most effective, the state here with one political system and one flag and the policy of extra - one, but the terms of reference which are distributed between the capital and the so - called (center) and the regions or provinces by the Constitutional labels for the Constitution of the Federal State, and usually happens to these countries or States are gathering a result of a constant threat to its existence in the case of survival of individual, or the presence of common factors between population, which prompts them to integrate in one state while retaining some of its terms of reference and this is according to the nature upbringing in which they arise federal state, The way growing up control of the capture of the powers broader and be specific powers, the federation as a solution to countries in which the plurality of linguistic minorities exist, ethnic or religious, can through the way the administration which is characterized by granting powers to manage own affairs similar to what is in being an independent state, there is a constitution and the authority of the legislative and executive authority private regional as well as judicial, and assume that the management areas Affairs authorities in line with the aspirations of the citizens of those regions and who are, in turn, the citizens of the State of the Union as a whole, but this organization and this administration is not absolute and not subject to the decisions of the center fully and absolutely, they first must take into account the age of the laws and legislation, the Federal Constitution, which is the cornerstone in this union the main pillar in it, as well as to not be the of those Territories mostly authority in the field of relations Foreign conclude agreements or enter into treaties as the continued federal State province, but the important thing here is that this system gives broad powers in the management of private affairs of the citizens of the province and who are often distinct from the rest of the citizens of the state, either linguistically or religiously or ethnically ... etc. of distinctions human, as well as allowing those regions the possibility to participate in political decision - making at the federal level, any internal autonomy in the management of private affairs, as well as participation in the central authority in the management of public affairs, any participation in the two levels of government, federal level Federal and level the other the regional level, Here you find minorities match in achieving stability and administration to its affairs that can not be obtained in other systems, it is worth mentioning the federal could go back Soaking up the majority in that State, The vast could have divided themselves on a geographical basis for the enjoyment of the powers granted in the Federal Constitution.In this federal place systems to become the world's safest communities unique, as it is through the powers it recognizes mainly the existence of discrimination within the geographical boundaries of that State, and also through his powers can these groups to exercise their culture and use their own language and legislation of laws fits (harmonious condition with the Constitution), and also Through its powers are both pillars of the pillars have achieved citizenship (rights and duties), so the sense of citizen full rights and sense not to threaten the group to which he belongs, as well as his sense of caution state parent so to speak, as a state sponsor of his presence and keep it, so his response positive and trying to bring himself second pillar of citizenship, namely the duties that fall upon himself, the state federalism, if what has been applying its own rules correctly, it keeps its unity and integration within distinct communities, saved breed has a desire to perform basic duties, and culture of others is prohibited and the recognition of uniqueness, generate the desire to stay and integration in that State, however, to predict human destiny remains under different systems of the imagination, the final We are studying and dealing with human hearts which is to change the earliest of stability, states and even the federal ones seen some internal vibrations which generated violence that left hundreds but thousands of the dead, but of course, the federal system is the most flexible in absorbing these vibrations and over her response to them.And it is through the foregoing are seeking through this research is to reveal the power of the federal systems in the containment and to deal with these groups and the possibility of maintaining the entity external unified state divided constitutionally internally, and also touched on the strengths and weaknesses in those systems and which could lead to a demand for secession or destabilize threat to internal stability and security of the state.It seeks this research is to clarify the concept, characteristics and models of the federal state, and the extent of the success of countries that adopted and what are the strengths and weaknesses, and go into the details of these points necessitated a theoretical framework to explain the reasons behind the adoption of some States federal model.the importance of studyingMinorities have become since for quite some time, one of the reasons for the spread of the phenomenon of instability, another reason for the intervention of foreign countries in the affairs of the countries where minorities live, and those countries Iraq, and the problem of minorities in Iraq problem back to the genesis of the Iraqi state, and that is the capacity of the subject and the possibility of stand on the achievements of this model in the management of the issue of minorities, we had to search in the federal which absorbed more different communities and differentiated, namely India and of pluralism, linguistic, religious and ethnic, and the possibility of description of these solutions to the case of Iraq and take advantage of how to survive one country for more than seven decades with all What content of pluralism and differences, and whether that Iraq, after less than two decades, could be his rein in Kurdish minority of separation, through integration into a federal state, but it remains to be said here to the actual application of this system and how growing up, this system has met success and acclaim in the States, and troublesome in other countries, including reflected recently on the level of acceptance or rejection of the idea of federalism in modern by the two countries, and therefore we dealt with this subject in detail together with the Indian model and compare it to Iraq, with the difficulty of comparison in terms of the size of the state and the nature of the population linguistic and religious and ethnic differences, but the foundation is how to manage diversity In the federal state.The study hypothesisOff thesis from the premise that, that minorities if they have been dealt with according to respect its presence and recognition, they will be a factor of stability and not a threat factor, and here the hypothesis started from the fact that the best systems for the management of internal diversity is the federal regulations, they provided the flexibility and capacity for absorption through and means available, to contain and to deal with these groups, policy, and who are, in turn, citizens where, here the basis of stability in the multi - religious countries and languages due to the federal system, which contained in those states internal differences, but this model is applied in a country without the benefit of Past experience in the federal rule, that makes this state is weak in the face of problems that may arise in the future, which makes these groups demand the right to secede from the body of the state, and thus its weakness and inability to remedy the other detachable demands, and it Federalism has the ability to full body politic to keep State if applied properly by the parties to form government (federal and regional).

اسرائيل والتحولات السياسية في البلدان العربية منذ عام 2010 Israel and political transformation in the Arabic since 2010 countries

اسم المؤلف: سلمان علي حسين العزي
اسم المشرف: صالح عباس الطائي
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: In this study titled (Israel and political transformations in the Arabic countries since 2010). We try to explain the eminent abilities and components which Israel has, especially the military affairs .It has a good strong developed one based on developed military industries of novel technology, all worked to arm the military army with most new weapon like nuclear weapon, in which the big military spending has a good role of that. In addition to that the economical abilities which came from Jewish donors, nonstop American support and German compensation, all these have a good role in building developed Israel commerce. Israel employed the Jewish experiences which had come from emigration to develop its economy, one of that is a big development of economical level in the country. In addition to that the technological abilities which have an eminent role to support the international and region Israel aims e.g. the fields of military industries and space fields like launching a grope of satellites for spying and collecting information . All of that make an obstacle against the international and region alliance of Israel to do its aims. Part of these eminent obstructions are social and inner political problems e.g. west and east Jews problems ,or disagreement between parties about main affairs like making of the constitution and who is the Jew ? In addition to that the economic problems e.g. lacking of row materials, oil ,Gas ,and lacking of water .Another important points are the need of near shops to sell their productions ,and no good strategic view as it is on a small land and surrounding with enemies . After that we go to search for the international and region effected points of Israel through searching the region effected points of Israel, one of them is turkey, Ethiopia, South of Sudan and middle of Asia, also what these points gave to Israel especially after the political changes in the Arabic countries in order to do its plans in Arabic area. Also we show the international points of Israel activity. U.S.A, European Union, Russian and china will be the first .This depends on a fundamental thinking of Israel idea as in depending on the great power in its international and region alliance. Another search, we go for the motives, the ways and the results of the Arabic political changes and its effects on the Arabic political reality then the Israel role in all of that depending on the central Arabic countries, e.g. Egypt Syria, in addition to another countries like Tunisia, Libya and Yemen. The role of Israel in the Arabic political changes depends on the continuity of demonstrations and unstable case in the Arabic countries, leading to the prepared aim of Israel for the Arabic countries .This leads us to search in the Israel American projects ,one of them is the Great middle East project and the strategy of its implementing through the creative confusion ,and the project of smashing Arabic countries depending on Bernard Luis and Audead Yunoon like dividing the Arabic countries to small unstable one ,and quarrel with each other, trying to put future possibilities for the nature of the relationship between Israel and Arab through three possibilities like the continuity of the relationship as it is or change it ,or both continued and changed one depends on each case

العلاقات الامريكية الصينية بعد الحرب الباردة وابعادها السياسية والاقتصادية The America - China relations after cold war , and its political , economic dimensions

اسم المؤلف: زينب عبد الله منكاش
اسم المشرف: رفاه شهاب احمد الحمداني
الموضوع العام: العلوم السياسية
السنة: 2015
الموضوع الدقيق: العلوم السياسية
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: A new data have appeared in the post - cold war age began features running through the erosion of the western strategic coalition elements with the collapse of the Soviet Union and the decline justifications western coalition in the face of the communist threat ,and the emergence of international competition indications strategy including economic and regional interests to form a so centers international political and economic influence. The relations - China relations is today one of the most international relations complicated in the international system. Both countries are located under the impact of new international data environment after the cold war, as well as that each is trying to show the embodiment of the elements of power, which is owned by another, as the United States of America is seeking to devote unipolar system by having an abortion all attempts by some emerging international powers to interpret the new international system form, while China is seeking to return ,and change this system.Therefore, this study aimed to analyze the economic and political relations between the United States , and China through its review of the elements of which plan the path of those relationships and to monitor compliance and repulsion between the two cases in the post - cold war age , and the development of future indicators of these relations imposed by the nature of the international system and international environment, the existing economic relations, which between them.This study has gone to emphasize the need for clear structure helps to organize and coordinate the study according academy of problematic from which scientific hypothesis that went to prove in order to reach the desired formulation of scientific results. In light of this has been divided this thesis into five chapters, as well as the introduction and conclusion, and in light of this division thesis into five chapters, as well as the introduction and conclusion has been through the review of intellectual perspectives U.S.A. - China's relations post - cold war by having the international system attributes after the cold war and the role of the realist school system and the balance of power and coalition in the study of international relations and the impact on U.S.A. - Chinese relations ,and determine the nature of this relationship the U.S.A - Chinese and vision of those relationships, as well as the most important factors affecting them and the reality of the U.S.A. and Chinese cognition to the reality of these relations There is review of the elements of economic and political power of China and the U.S.A., and the areas of cooperation and coordination between the two countries in the field of trade and investment, energy and foreign debt. Economic, political ,and social determinants of U.S.A. - China relations, and finally had been reached that The expected future framework of U.S.A. - China relations is located within a combination between the rival and partner of the United States ,but not as a strategic partner to the inability of China's access to the international standing of the United States. Therefore, in the interest of China that offers all the ingredients that induce the United States to take its international partner in the future.

المتغير الحضاري والامن الدولي (جدلية العلاقة) The Civilizational Variable and International Security “Dialectical Relaioship

اسم المؤلف: رشا يحيى عبيس هاني
اسم المشرف: قحطان كاظم محمد الخفاجي
الموضوع العام: العلوم السياسية
السنة: 2015
الموضوع الدقيق: العلوم السياسية
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: It can be said that the search in the manifestations of contemporary international politics with the feasibility of the scientific and practical point of view at the same time together, by virtue of the world that today's world can not be synaptic States if Maoradt development and progress can live isolated encrusted on itself.This thesis has tried to answer a series of questions revolves around its axis Perhaps Atralamngar civilization and the extent of influence on international security.The study examined carefully to Othertasara events on the cultural variable and effervescence of his face and the nature of its relationship to international security on the other.Given that the aim of the thesis is to highlight the dialectical relationship between international security and the changing culturalAnd depending on what it contained treatise of chapters and sections and demands, it concluded a number of results can be summarized the following : An change is a comprehensive process of formats, jobs and social relations, both personal and international levels, a process Mtaataddh and dimensions. The importance of the change in international politics lies in the control change and Tgeyemcn say that research in contemporary international politics phenomena with the feasibility of the scientific and practical point of view at the same time together, by virtue of that the world is today's world Synaptic can not countries if Maoradt development and progress can live isolated encrusted on itself. An political change is being General, lasting and comprehensive multi - dimensional phenomenon and parties, complicated and complex to a very large and infinite extent and impartial and last but not least, the phenomenon of time depends on the time as the decisive factor in the change.3_an There are several theories as to why the process of change. There are those who view the process of change as an evolutionary process, whether in writing or taken form circular. Ually this basis, international Mralamn changes were sensible developments and changes are sometimes spontaneously as a result of increased international interactions and taken a certain form on the level of international political summit pyramid.UN Security. An not and will not settle on one format, but will take Mtaatadh forms depending on the objective and subjective conditions as well as security developments in the case, which began significantly affected Pmaihdt in the international environment An There are many forces of change, and perhaps the most important international structure which serves as the director of the forces of change driving direction formed - aa structural Atah - then back again, according to the curriculum analytical systemic way nutrition retrospective feed back to be input and the forces of change is pushing for the events of a particular form of the phenomena of out. That the change in the presence of the enemy and the disagreement will affect the UN Security adjust the process in all its dimensions, because the strategies and tactics that will be followed by the actors in the international scene will change depending on either deems appropriate to achieve its security. Cultural variable that takes two principal forms to influence the UN Security Council. It entrance Adtraba security and orderly entrance. There are more than approach the entrance and reflecting the impact of the changing cultural kuna Adtraba or organized international security. It could be argued that the global entrance and entrance regional basis in those two entrances and can not be rigid separation between them, but that one is complementary to the other are provided one over the other depending on the international situation prevailing in this era or that. We are studying the impact of the elements of civilization at the international security and how to have an impact on the nature of the composition of the communities where we find it is not possible that any civilization without it have the ingredients to be based upon the basis of its existence. We find that the social and historical denominated find that Almojtkaaat is the foundation upon which civilization and therefore even international security is mainly based on the groups of people and achieve their security So is this ingredient essential to the relationship between the parties 12. As for the material and technical chiropractor, we find that civilization can not be exist without that there will be the basis of material and technique based upon where that human evolution and its dependence on the machine and industrial development and Altjaramanm in the creation of civilization and the impact on international security. Also denominated as the environmental and natural climatic conditions Almaatihomaihdt of changes in the environment are Bmjmlhatather civilization and thus receive Bdilalha on the UN Security In addition to the intellectual and cultural rectifier which is one of the important ingredients in building and basic civilization and thus became the main influences on the UN Security Council. The UN Security depends on the relationship of interaction and Altoaagaf, meaning that the behavior of any of the units of the international system affects the nature Allamn and that these same civilizations countries are influential on the UN Security 16 - that the variable civilization possible to be Adtrabaa international security through the influence of the UN Security and possible to be a element Sraia Baltla and poses a security obsession States Emergence of extremist movements that have become a danger to international security Associated with these movements cultural backgrounds where we see the emergence of radical Islam or fundamentalist tide, which has become a threat to international security and thus there became obsessed with the fear of these Aharklt, which has become an influential heavily on the UN Security imbalance. Struggle for the interests and values which has also become a cultural worker hired to threaten international security.Civilization variable also takes the other hand, being an entrepreneur, a side entrance to international security, not only Adtraba.The ivilizational variable because it possesses the humanitarian missions and humanitarian tasks that could be a factor organized international security and Thakqiq kind of stability. Well that the variable civilization based on scientific and technological progress and the emergence of this progress would work in an orderly fashion to international security. On the other hand became orientations to the need for there to be an international approach to address these movements and work to maintain the stability of the UN Security There has become an international conviction dangers of sectarian and religious conflicts, the urgent need to style or the way to face them in order to maintain international security. Expected to see a significant international structural change and that there will be a new kind of pluralism, but this time be pluralistic participation of any US - led pluralism. And this would be reflected on the future of the UN Security. Confirm that the next and imminent danger to humanity is not the spread of nuclear capabilities as far as what is the proliferation of conflicts and their development, which would be very dangerous if based on a nuclear technology that could be used in a changing world.Where we find the emergence of two types of convergence or alliance of civilizations Altair on the UN Security played a role in Altat. They are : The first approach : Alliance Alammeraki_alurbi_alasiraiala and trying to draw international security that you see fit according to the National Aamnha and therefore varies with each of its vision is threatening international peace and security andThe second is the Chinese approach Islamist alliance - Russian - which constituents of the LES also draw peace and security in accordance with that you see fit.And here we find that this Athalv to take two aspects : - The first is entrenched civilizations in order to face what might urge her and thus affect the UN SecurityThe second is cooperation, or balance among civilizations in order to ensure that the UN Security settledAnd therefore, the future of the cultural variable and its relationship to the international security of : - Either variable decline of civilization and remains active but highlights the other elements of a political, economic and technological impact involved in the UN SecurityAwalamn International is the one who becomes a civilized intellectual Bdalalath variable factors becomes security measures, but not just semantics patterns and be the basis for international security and affect it.And it has to the changing cultural and International Security always in the dialectic of the relationship and that one Aathelr is affected by the other

مكانة ايران الاقليمية في الاستراتيجية الامريكية بعد عام 2003 Iran's Regional Status in the U.S Strategy After 2003

اسم المؤلف: احمد عبد الكاظم موسى
اسم المشرف: محمد كريم كاظم
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:

الاستراتيجية الشاملة للولايات المتحدة الامريكية ومستقبل التوازنات الجيواستراتيجية العالمية

الموضوع العام: العلوم السياسية
السنة: 2015
الموضوع الدقيق: الدراسات الاستراتيجية
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الكلمات الدلالية:
  • العلاقات التركية الاوربية
  • العلاقات التركية
  • الامريكية
  • تركيا والاستراتيجية الامريكية
  • الدور التركي في الاستراتيجية الامريكية
  • المنظور التركي للعلاقات مع الولايات المتحدة الامريكية
  • صنع القرار الخارجي التركي
  • دور المؤسسات الرسمية وغير الرسمية في عملية
الصفحات الاولى:
المستخلص: Through the study of "the comprehensive strategy of the United States and the future of the global geostrategic balances" it becomes clear that the rapid developments and changes in the global environment are redefining the global geostrategic balances, with the dawn of the twenty - first century many indicators and variables that indicate the movement of global balances on the verge of moving into a new phase have accumulated to confirm the decline of the United States ability to control the direction the movement of balances individually, Although it is still the strongest but no longer the only party in the balance, Since the emergence of the world's major powers having the capacity, the will and active performance as well as and prowess to face or reduce the American capacity to control the movement of the soft power by means of balance and peaceful ascent or the so - called "fine balance" and to abide by the rules of international law and not to resort to military force in international crisis management and processing the objectives and interests depending on the basis of partnership, the United States looks forward with growing concern to the shrinking margin over military and economic capabilities compared to those of China and Russia and a range of powers Described as emerging, including India and Brazil, which will accelerate the end of the era of the so - called American Empire is progressing chronologically and with amazing speed, with global powers being able to join forces with geopolitical and geo - economic partnership frameworks as well as the military to stop the expanion of U S hegemony on the world.The international system has seen structural shifts made him go away slowly on the imbalances that were dominant in the international hierarchy since the end of the cold war, coincided with the relative decline of the economic strengths for most Western capitalist countries and especially the United States, as a result of the economic and financial crisis that began in 2008, global powers rising in Asia and Latin America continued to achieve high rates of economic growth despite the nature of the interdependence of the world economy, promoting the growing economic power inevitably strengthens the strategic power of the forces balancing with the United States, both with regard to the implementation of development plans drawn or military budgets or strategic capacities make it an active actor having formulating will in the future of the World geostrategic balances. Thus the polarization of international forces is moving towards the formation of groupings and international strategic partnerships between influential world powers active in regional and international policies, and in the geopolitical, economic, military, and technological areas, depending on their material and moral potential, as well as elements of the external environment and providing an incentive for future influential roles in the future of the global balances movements.The United States recognizes that the transition strategy is great, and it should adapt to the developments of the global system, witnessing the rise of new forces which have the power and ability to build partnerships and organizations with strong influence over some nation States, despite the fact that the United States is the largest military force in the world, we found it stumble in its wars of expansion, and the economy weakens more and more because of the stiff competition faced by the economies of other emerging powers And, if the U.S adapts to those changes, with better cooperation with world powers, we will see a smooth and peaceful transition to a pluralistic system and geo - strategic balances evenly without disasters and wars, the United States will become an important actor beside the other world powers.And by analyzing the extensive strategy of the United States and that of the world powers towards issues, crises and areas of influence dealt with by these forces, and knowing the main variables that affect the international environment, several conclusions were reached as follows : -  There is a relationship of mutual influence between the nature of the international system, its structure and its mechanisms and the existing global geostrategic balances, in the unipolar system in the case of imbalance the balances are under the control of a single pole and its allied forces, that Pole dominates on the interactions and strategies of its rival powers and deter them. Under the bipolar system the established geostrategic balances are closer to relative parity between the poles or the two blocs and often their relationship are with conflicting strategies rather than cooperative ones, which pushes the movement for change in balances more quickly. In the multi - polar system world balances are based on three or more poles, which makes them more stable. Geo - balances in That its more cooperative and partnership strategies that to compete and conflict and move towards a complementary relationship finding mechanisms to ensure the interests and objectives of all States and prohibit overtaking them. all strategic variables affect the change of states power positively or negatively, and accordingly, the global geostrategic balance change occurs, the State which possesses mechanisms to control and manipulate those variables, enable it to achieve the greatest impact in the movement of balances for achieving its objectives, this was evident in the achievements and performance of the extensive American strategy after World War II, and then after the collapse of the Soviet Union enabled by mechanisms of the capitalist system as well as its capabilities and potentials, employing events and strategic variables, To achieve strategic balance with the Soviet Union and continued superiority or maintaining control over balances after its collapse through the use of the soft power and hard or smart power that enabled it to achieve many of the benefits of preventing the emergence of rivals and winning the support of the largest possible number of States to its side, to control the movement of geostrategic balances for achieving its goals and its national security.  with the dawn of the twenty - first century the U.S strategic performance is witnessing change and decline in its influence and interests, at the level of the Middle East after the destruction and occupation of Iraq and supporting Arabic movements change, and perpetuating crises as the Syrian crisis, the United States withdrew from direct interaction settings depending on the strategy of driving from the back and giving active roles for regional and international powers it had put them in a list of enemies and rivals such as Iran, Russia and China, Which is reflected on their active roles to approach new areas of influence. After a series of U.S political and military failures, in Afghanistan and Iraq, and the global economic crisis and deflation and recession in the United States and Europe it, began looking for new alternatives to lead the world in a more stable and secure, less unique and unilateral domination, So some great powers found that it can influence worldwide reactions, and the participation of the United States to let the world stand on solid substrates, to become more balanced and stable. the emergence of global forces with strategies backed by strategic performance aimed at ending U.S. geostrategic balances Singularity in the world, especially in the areas of influence of the strong competition for the United States. In this chaos and the American decline globally, Russia and China have found their chance in pushing balances movement through the Syrian crisis especially as the Arab countries witness the Arab spring setbacks and uncertain future, Russia and China have also found that the EU suffers from economic crises hitting its members, and the United States is not better than the EU it is preoccupied with finding new opportunities to revive its collapsed economy, while Russia and China lead a role that rejects any American trends both toward Syria or Iran and Ukraine, As well as the rest of the spheres of influence which threaten national and energy security. the geostrategic balance theory derive from the basic assumption that, if States are not associated with each other in lasting relationships, but in the case of constant change driven by considerations of power, and seeking to increase investment of their capacity. components and reorganizing their relationships and the quality of their interactions to achieve balance with the United States. On that basis, China turned to a new strategy, which seeks to restore its former influence, through the initiative of the new Silk Road project, which integrates with waking up Russia and the presentations of dissertations Uras union integrated. with India's wishes, looking for new maps, here, the new formations and clusters, such as the Shanghai Cooperation Organization, the community and the Group of 20 Bricks, become an objective and necessary response, to reproduce a new world, with multiplier balances, which provides a safe departure for human society, towards the prospects of cooperation and integration, and to get out of the crises, And thus came the international orientation of the strategic triangle (Russia, China and India) to lay the foundations of this world, through enhanced cooperation among the three countries and increased economic ties, forming a image of an Asian pole having its own system. No doubt, the bilateral and multilateral strategic partnerships formed between the forces of competition would have widespread impact in steering reactions and global geostrategic balances, since the movement of their own balances will be controlled by global trends in corporate strategy formation held with States converged in interests and goals, as well as its capabilities contributing to the success of strategic performance.  the future of the geostrategic equilibrium which started after the U.S downturn posed by features and confirmed by facts and events in international interactions and strategic partnerships formed by world powers competing with the United States indicate the direction of future balances movement towards equivalence in potential and capacities and resulting performance of strategic and global influence shared by world powers with a view to defending their interests and objectives of the powers allied with it

مكانة اليابان في النظام السياسي الدولي الواقع والمستقبل Japan's stAtus in the international political system : Present and Future

اسم المؤلف: علي رسول حسين المسعودي
اسم المشرف: فكرت نامق عبد الفتاح العاني
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:

السياسة التركية تجاه سوريا بعد 2002 Turkish policy toward Syria after 2002

اسم المؤلف: عباس سعـدون رفعــت
اسم المشرف: محمد كريم كاظم
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: he subject thesis deals with international politics issue and it is useful because it clarifies how to deal with foreign regional and international environment and how to arrange it to serve a state interest in general as far as in understudy interest to make use of its results in national issues. The subject of this thesis (Turkish policy toward Syria) is very important due to the several variables like Turkish and Syrian policies and their mutual effects on Iraq. Studying Turkish foreign policy toward Arabic region in general and Syria specifically clarifies its change from being stable then dropping Arabs and Syria as a choice before 2002 then act intensively with the issues of Arabs including Syria since 2002 while in 2011 Turkey left its neutrality and non - interference in internal Arabic issues as Arabic revolutions broke up and started interfering to express its existing power with points of view to what happening in its neighborhood. As the Syrian condition specially after 2011 regarded as a special case, studying the Turkish dealing with it is important because it gives us evidences about what Turkey plans for coming years depending on the development scale of its policies in the past years in general and toward Syria specially. The Turkish policy toward Syria as we clarify in this thesis, passed several stages of development as it started with a revolution and multi - contents struggles but it turned to stability after 1998 then started cooperation specially after 2004 till 2011 when it was turned hard down then the struggle indications begun between the two countries with strong clashes and high level interference. The conflict of this thesis is linked to the following question : Why the Turkish policy toward Syria figured in this way since 2002 and the answer of this question as it was shown in this thesis refers to the wide effect of Justice & Development Party on the Turkish policy that push Turkey to play its role in accomplishing changes in the Arabic and regional countries including Syria as a result of the international changes and pressure. In other meaning, Turkey designs its foreign policy in depending on two factors : The first one is related to its commitments with NATO and western relationships which is the main factor pressing on all circles of interests. As western countries represent the main circle of interest and all the roles of turkey are as a results of the NATO and west demands. The second factor is related to its power and historical reasons which were aroused toward Arab region in 1970s rationally when the western countries ignored Turkish interests in Cyprus and also because Turkey as an industrial country in need for energy, markets and capitals was influenced by Arabs oil ban and also because Arab region is encouraging to open chances to turkey. Within 1990s, several controversial issues appeared in Turkey - Arabs relationships generally and with Syria specifically like : - Water issue, Turkey has plenty of water resources with ambitious economic trends but also has problems with Kurds. So turkey used water to have several aims for instance to develop Kurdish areas to push them to leave politics to production and also used water in making peace in middle east to have central statue in the regional relations but that thing caused crises with Syria and Iraq because it lowered water level in the two countries. - Kurdish issue, Turkey does not admit about the Kurdish existence in turkey while it helps Iraqi Kurds by giving them facilities to world via Turkey that revealed the Turkish dual standards in dealing with Kurds problem for its cooperation with Kurds in other countries as a pressure method while all rights of Kurds in turkey are forbidden. Syria made use of that to gain benefits in its relationship with turkey from 1995 to 1998. - Border issue, Mosul and Iskenderun are the main problems. Turkey demands to take Mosul because it was not under the alien's occupation in the First World War in the time of signing peace agreement between fighting countries while Turkey kept its control over Iskenderun as a result of its agreement with France when turkey agreed to participate in the Second World War beside the aliens. From time to time, that subject is aroused and influences on the two countries relations. As a result of the two factors activity (west and Turkish trends) we found that turkey started to take part in Arab countries generally and toward Syria specifically after the demonstrations begun as it was related to internal factors interaction (related to the public desire to end political introversion) and also related to external factors ( the American desire to rearrange the political map in Arab countries in general through chaos and inner struggle in Arab societies). So, turkey involved in internal roles and its policy was implementing in accordance with west countries desires for example, Turkey threatens use military power to protect civilians but stop going further because the western countries do not like that. On the light of what presented before, the conclusions are : 1. Turkish policy is influenced by several internal, regional and international factors and the most important one is its links with west to do what they like turkey to do in its region as changes occurred after cold war.2. The Turkish policy toward Arabs is not stable for its link to the west because the economic reasons and (energy, water and Kurds) are pushing to make bilateral relations not confronting while we find out how turkey gives high importance to its relations with Israel (in spite of what happened in Lebanon in 2006, what happened in Gaza in 2008 and also the freedom fleet in 2010). In other meaning, the Turkish will is under the west control.3. The Turkish policy toward Syria moved from clash and difference before 2002 to cooperation after2004which refers to bilateral readiness of cooperation in spite of difference issues in Turkish - Arabs relations. Turkey is aware of the stress that Arabs can use against it just like Kurds issue. So if Arabs lack legitimate in govern, turkey did not decide yet the identity of state and the future of Kurds in turkey.4. The link between Justice & Development Party and Islam might produce some Turkish attitudes toward Arabs including Syria but the type of the Turkish interference in the Syrian event after 2011 showed that the Islamic factor is not active among Turkish government and its trends as strong as the link with the west. 5. Future suggests that turkey will have more interference in Arabs region issues because of its link to the west and also due to the continuous western efforts to push turkey to play roles in Arab countries that gave turkey significant statue after 2002, so turkey won’t sacrifices what gained as it inherits the Ottoman State and the regional change (the rise of Iran and also the rise of sectarianism in regional treatments for several reasons). None of that will make Turkey withdraw from interference in Arabs issues especially in the Syrian developments.Finally recommendations are : 1. Making importance to study all aspects of Turkish policy because it has developing trends, interests, issues to deal with and participating powers.2. Giving importance to studying all regional policies because studying Turkish policy toward Syria showed how regional implement its plans at the expense of other region states and people interests including Iraq. Therefore, it is important to make all that studies to help the Iraqi decision maker to take decisions and act in accordance with scientific and theoretic visions.3. Paying attention to the interconnectedness regional relations and interests. The Syrian crisis and its results presented that interconnectedness between regional countries in historical, geographical, political, ethnic and religion while ignoring that cause chaos in all countries.4. Making importance to study all the ways that lead to enhance Iraqi interest in regional relations as serving Iraq is the final aim of every thesis. Then making that studies deep to enable Iraq in accomplishing regional balance and achieve his interests in the region. What is related to this thesis we have to as a recommendation encourage building full regional security system to prevent some powers to possess alone the regional actions to fulfill its or another international interests.

النخبة السياسية في العراق 1958 - 2014 : دراسة في التوجيهات والاهداف The political elites that ruled Iraq (1958 - 2014) studies in trends and goals

اسم المؤلف: سعدي ابراهيم حسين
اسم المشرف: ليث عبد الحسن جواد الزبيدي
الموضوع العام: العلوم السياسية
السنة: 2015
الدرجة: دكتوراه
اللغة: العربية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: The present dissertation consists of four chapters preceeded by an introduction and followed by a conclusion . It sets out from questioning and if the political elites henceforth (P.Es) successivly ruled Iraq for the period (1958 - 2014) are and the same trends and gools ?The dissertation replies This inquiry by hypothesising that the (P.Es) successively ruled Iraq vary in their trends and goals , as each has its own ones . The trends and goals mainle of (P.E) ruled for (1958 - 1963) concentrated on constructing Iraqi state . The (P.E) of (1963 - 2003) was of Arabic national trends and goals . As for the (P.E) came to power in Iraq after 2003 , they are of no clear trends and goals , considering their different national , religions and sectarian trends and goals .To verity of valility of this Aypothesis , Ch1 studies the (P.E) ruled Iraq (1958 - 1963) . Ch2 studies the (P.E) ruled for the period (1963 - 1968) . Ch3 studies the (P.E) ruled Iraq (1968 - 2003) . while Che4 concerns the study for the (P.E) ruled since 2003 till 2014 .The disser tation has come to the following conclusions : First : - the ruling(P.E) of (1958 - 2003) are of persons mostly come from military establishment , with an important exceptions when these elites by headed by civil leaders , as the case with the political (Abdulrhman Al - Bazaz) who became prime minster , and the former Iraqi president (Saddam Hussein) came to power in 1979 as a president. the later , in spite driving himself to the military establish meant by seizing the biggest military rank , he still being actually a civilian .Second : - The (P.E) ruled Iraq before 2003 depended on their own capacities to take the power by making revolutions coups . While the (P.E) came to power after 2003 till the time of concluding this dissertation , depended on external factor represented by USA support to expel the previous (P.E) and substitute it by recent (P.Es) .Third : - The (P.Es) ruled Iraq all over the period specified for the purpose of the present study didn't succeed to a achieve their trends and goals , moreover , they encountered by internal obstacles and the (P.Es) themselves , as well as home and external (regional and international) obstacles .So , we could say the trends and goals that helped (P.Es) to take power , were at the same time reasons behind losing the power , especially before 2003 .After 2003 , the (P.Es) national and sectarian trends and goals were negative factors led rulling system specially and the whole country in general to many economical , political and security problem and crises . the most prominent one is the national and communal political share in rulling Iraq .Finally , the dissertation comes to a list and suggestion , including : - 1 - concerning the future (P.Es) trends and goals it is suggested that the new (P.E) have to adopt popular national trends and goals of all Iraqi people suitable for Iraqi situation , which promots and at the same time supported by the a general unified national identity . the best possible suggested strategy to achieve this to follow the steps and rebuilt state resemble that and ancient Iraqi empires since it unified all Iraqi nation under their title , as no Iraqi Arabs , Kurds and other could deny his Hondo our to be belong to those civilizations .So , we could keep Iraq away from the risk of national and sectarian trends and goals .2 - concerning the mechanism to take the power : - The study suggests that the peaceful exchang of power is that best way must be adapted by the future(P.E) as it is founded by USA in Iraq after 2003, and they must leave the second alternative , i.e the violence to take the power which was the only way the past since 1958 .3 - concerning the political performance , the study concentrates the necessity of correspondence between trends and goals on one hand , and the (P.Es) , performance on the other hand . this could be achieved by adopting reviewing trends and goals periodically by the (P.Es) and reforming these trends and goals to be realistic of applicable within a reasonable and useful period for Iraqi people , not imaginary and Uri realistic like establishing national state , while the existed Arab countries are under the risk of partioning one after one . Neither trying to establish a communal (sinni or Shiite) state while Iraq realy consists of more than one religion or sect .

تحسين خوارزميات الحل التام والبحث المحلي لحل بعض مسائل الامثلية التوافقية Improving Exact and Local Search Algorithms for Solving Some Combinatorial Optimization Problems

اسم المؤلف: فائز حسن علي
اسم المشرف: طارق صالح عبد الرزاق
الموضوع العام: علوم الرياضيات
السنة: 2015
الموضوع الدقيق: الامثلية العددية
الدرجة: دكتوراه
اللغة: الانكليزية
مكان الجامعة: بغداد
الصفحات الاولى:
المستخلص: In mathematics and computer science, an optimization problem (OP) is the problem of finding the best solution from all feasible solutions. OPs can be divided into two categories depending on whether the variables are continuous or discrete. An OP with discrete variables is known as a combinatorial optimization problem (COP). In a COP, we are looking for an object such as an integer, permutation or graph from a finite set.The aim of the research presented in this thesis is to investigate the use of various optimization exacts and heuristics to solve the COP's. This thesis presented in six chapters.In this thesis we interest in discussing three samples of COP; machine scheduling problem (MSP), transposition cipher problem (TCP) and aircraft landing problem (ALP).In the first two chapters, we discuss the main concepts of the COP, the three study cases, the basic techniques and methods for solving the COP respectively.In chapter three, we interesting in MSP, with multiple objective for the 1//(Ci,Ti) problem (P1) and 1//Ci+Ti problem (P3). We investigate the usefulness of precedence rules in solving (P1) and (P3). We found that the complete enumeration method (CEM) gives efficient (and optimal) solutions for (P1) (and (P3)) with number of jobs (n)10, and branch and bound (BAB) gives efficient solutions for (P1) with n15 and optimal solution for (P3) with n80. In addition, we use the local search methods (LSM), to solve the two problems, represented by genetic algorithm (GA) and particle swarm optimization (PSO) with n2000. In general we conclude that PSO serves better than GA. Lastly, a neural network (NN) is constructed to solve problems (P1) and (P3). Two learning algorithms are used to learn the NN; pack propagation (PB) and PSO with and without depending on successive rules (SR). We see that PSO is better than BP in learning NN to obtaining good results.In chapter four, we suggest a new direction in cryptanalysis of TCP, we suggest using the techniques of COP to solve TCP in another word, the TCP treated as one of COP. First a new mathematical formulation for TCP is introduced and proposed some new tools of TCP cryptanalysis. The CEM and modified BAB are developed by using SR to obtain the multi digits CEM (MDCEM) and MDBAB which are helpful in decreasing the CPU time. Classical bees' algorithm (CBA) and shifted key BA (SKBA) are improving the cryptanalysis results. To increase the performance of the mentioned algorithms we construct cryptanalysis system for TCP to find exact solution (as possible) for n20 in reasonable time, which is called SR keys BA (SRKBA). The main result of this thesis is suggesting a general solving system for COP specially, when the problem submits to SR.Chapter five focused in one of the important problems of COP; ALP. A new improvement in a heuristic method, called parallel improving algorithm (PIA), is introduced, the new algorithm called modified PIA (MPIA) which is serves better than PIA. The CEM is used to solve ALP using two techniques; exhaustive search method (ESM) which gives optimal solution but in unreasonable time for n>9 while MPIA gives approximation solutions for n9 in 6 seconds. Lastly, hybridization is proposed between MPIA and CBA, which is called improvement CBA (ICBA). ICBA gives optimal solutions in solving ALP for n<50 and near optimal for n=50.In chapter six, some conclusions together with some suggestions for future researches have been given.The exact and heuristics methods all were tested by programming them using version 10.0 of Delphi Language and MATLAB, and running on Processor Intel(R) Core (TM) i3 CPU, 2.53 GHz, Core(s), with Ram 1.21 GB computer.
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