Show: 25 50 75 100 Results

Search results: 25 out of 94

تحضير بوليمر موصل (PANI) ومتراكباته النانوية ودراسة خصائصه الكهربائية والبصرية == Preparation conductive PANI and their nanocomposites : study electrical and optical properties

Author name: امنة مهدي ابراهيم
Supervisor name: ثامر عبدالجبار جمعة
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

قياس مستويات النشاط الاشعاعي في المياه والرواسب بالقرب من محطتي ( الزعفرانية والدورة ) لتوليد الطاقة الكهربائية في مدينة بغداد == Measurements of Radioactivity Levels in Water and Sediments near two Power Plants(AL-Zafranya and AL-Dora) in Baghdad City

Author name: ضحى رعد مظلوم الخفاجي
Supervisor name: ندى فاضل توفيق
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

الخصائص الفيزيائية لمادة المتراكب PMMA/ZnO == Physical Properties of PMMA/ZnO Composite Material

Author name: زمن صاحب عبيد
Supervisor name: ثامر عبد الجبار جمعة
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تقنية التحليل الطيفي للانهيار المحفز بالليزر لفحص تركيب الاسمنت == Laser Induced Breakdown Spectroscopy Technique for Identification Cement Structure

Author name: تغريد خالد حمد
Supervisor name: علاء جبار غزاي | علاء حسين علي
General topic: Physics
Specific topic: Physics
Degree: Doctorate
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

دراسة تحسين جودة الاشارة لمضمن الصوتي البصري == Study the Signal Quality Enhancement for Acousto - Optic Modulator

Author name: محمد فؤاد مجيد الحداد
Supervisor name: احمد كمال احمد
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

دراسة التكسر وتحليل السطح البيني الملحوم بين الزجاج والمعدن == Investigation of Fracture and Surface Analysis of Joined Interface Glass-Metal

Author name: محمد عماد هاشم
Supervisor name: ثامر عبد الجبار جمعة
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تصميم متحسس الياف ضوئية بلورية == DESIGN OF PHOTONIC CRYSTAL FIBER SENSOR

Author name: سرور علي مهدي الخفاجي
Supervisor name: سهى موسى خورشيد الاوسي
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

حسابات هارتري - فوك النسبية لمجموعة 15 الذرية وبعض الجزيئات ثنائية الذرة == Relativistic Hartree-Fock Computations of Group15 Atoms and Some Diatomic Molecules

Author name: بلال خالد جاسم المشهداني
Supervisor name: سعد ناجي عبود | اياد عبد العزيز العاني
General topic: Physics
Specific topic: Physics
Degree: Doctorate
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تزامن الشواش في ليزر اشباه الموصلات بطريقة التغذية العكسية لمراة الحلقة البصرية == SYNCHRONIZATION OF CHAOS IN SEMICONDUCTOR LASER BY MEANS OF OPTICAL LOOP MIRROR FEEDBACK

Author name: بان مظفر البياتي
Supervisor name: احمد كمال احمد | قيس عبد الستار النعيمي
General topic: Physics
Specific topic: Physics
Degree: Doctorate
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

نموذج نظري للتصوير من خلال العيوب البصرية والوسط غير المتجانس بصريا == THEORETICAL MODEL FOR IMAGING THROUGH AN OPTICAL DEFECTS AND INHOMOGENEOUS OPTICAL MEDIUM

Author name: حسن حمادي حسن
Supervisor name: اياد عبد العزيز عباس
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

التعرف على قزحية العين باستخدام التحليل المستقل والمكون الرئيسي == IRIS RECOGNITION USING INDEPENDENT AND PRINCIPAL COMPONENT ANALYSIS

Author name: ياسر عدنان جاسم
Supervisor name: ليث عبد العزيز العاني | اياد عبد العزيز العاني
General topic: Physics
Specific topic: Physics
Degree: Doctorate
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

متحسسات الالياف الضوئية البلورية : نمذجة وتطبيقات == Photonic Crystal fiber Sensors : Modelong and Applications

Author name: حسين ثامر سلوم الدفاعي
Supervisor name: احمد كمال احمد | عبد الهادي مطشر الجنابي
General topic: Physics
Specific topic: Physics
Degree: Doctorate
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تصميم حاسوبي لحارف كهروسكوني باستخدام كثافة الشحنه == Computer Aided Design of Electrostatic Deflector Using Charge Density Method

Author name: مهدي احمد محمد
Supervisor name: احمد كمال احمد
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تحضير ودراسة خواص اسلاك فائقة التوصيل باستخدام المركب (Bi2Sr2Ca2Cu3O10+?) == Preparation and Characterization of superconductor Wire (Bi2Sr2Ca2Cu3O10+?)

Author name: عمر عدنان الربيعـي
Supervisor name: Emad K. Al-Shakarchi
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

دراسة استعمال المواد المحليه في تقصير الزيوت النباتيه

Author name: رشا شكيب حميد عبود صالح مكيه
Supervisor name: ازهار جواد داوود
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تصميم حاسوبي لمراة مغناطسية == Computer-Aided Design of a Magnetic Mirror

Author name: حسين علي وهيب الحسيني
Supervisor name: احمد كمال احمد
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تصميم مراة ايونية تعمل كمصحح للزيوغ باستخدام طريقة القيم الحدودية == DESIGN OF ION MIRROR AS AN ABERRATION CORRECTOR USING BOUNDARY VALUES METHOD

Author name: محمد سلام مزاحم العبيدي
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:

تصحيح الزيغ بسبب عدم التراصف في العدسات الكهروسكونية == THE ABERRATION CORRECTION DUE TO MISALIGNMENT IN ELECTROSTATIC LENSES

Author name: رؤى تحسين عبد الله الصميدعي
Supervisor name: احمد كمال احمد
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: اجري بحث حاسوبي في مجال بصريات الجسيمات المشحونة. يهتم البحث بتصميم منظومات عدسات كهروسكونية بوجود وعدم وجود تاثير عدم التراصف تعمل تحت ظروف تكبير مختلفة.ان توزيع مجال الجهد لعدسه احادية الجهد وعدسة مغمورة كهروسكونية تم تمثيله بدوال تحليلية. تم حل معادلة الاشعة المحورية للمجالات المقترحة لايجاد مسار الجسيمات المشحونة المارة في كل عدسة. ومن توزيع الجهد المحوري ومشتقتيه الاولى والثانية .تم حساب الخواص البصرية كالبعد البؤري والزيغين الكروي واللوني. كذلك تم ايجاد شكل اقطاب كل عدسة كهروسكونية ببعدين وبثلاثة ابعاد. ويعتمد الزيوغ في العدسات الكهروسكونية اعتمادا كبيرا على تراصف الاقطاب، وقد وجد انه عامل مهم يؤثر على الشكل الهندسي لمنظومة العدسة الكهروسكونية. ان نتائج هذه الدراسة لا تبرهن نظريا" امكانية تصميم منظومات عدسة كهروسكونية بزيوغ واطئة فحسب بل تبين امكانية تصنيع مثل هذه العدسات عمليا". | A computational investigation has been carried out in the field of charged - particle optics. The work is concerned with the design of electrostatic lenses with and without misalignment effect operated under different magnification conditions. The potential field distributions of einzel and immersion electrostatic lenses have been represented by analytic functions. The paraxial ray equation has been solved for the proposed fields to determine the trajectory of the charged particles traversing each lens. From the axial potential distribution and its first and second derivatives, the optical properties such as the focal length and spherical and chromatic aberrations have been compute. The electrode shape of each electrostatic lens has been determined in the two - and three - dimensions. The aberration of the electrostatic lens is highly dependent on the alignment of the electrodes and it has been found to be an important parameter affecting the geometry of the electrostatic lens system. The results of this investigation not only prove in theory the possibility of designing electrostatic lens systems with low aberration but also show the possibility of constructing such lenses in practice

تاثير نسب ومعاملات الحزم على دقة تصنيف صور الاقمار الصناعية المتعددة الاطياف == Effect of Band Ratios and Indices on Classification Accuracy of Multispectral Satellite Images

Author name: سيف كامل شنين
Supervisor name: اياد عبد العزيز العاني | صلاح عبد الحميد صالح
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: Multispectral satellite images are holding whole information about the areaunder investigation. Many of digital processing techniques are used to extractmost of the possible information from these images, such these techniques arespectral band ratios, Tasseled Cap transformation and Principle ComponentAnalysis (PCA). These techniques are play good part for features extraction andreducing the number of spectral bands with no loses in information.The research aims to apply classifications on band ratios and image indiceswhich include PCA and Tasseled Cap transformations, of Enhanced ThematicMapper Plus (ETM+) satellite images, and to show how the accuracies of theclassification are differ from the accuracy of classification of the raw ETM+ bandsimages.The results show that the best bands ratios that adopted to represent fiveselected land features are 5/7, 4/5, 2/5, 1/4, and 2/4. Optimum Index Factormethod (OIF) has been adopted on raw bands combinations, and on the bandsratio combinations to select which band combination that contains muchinformation, where the results show that the best combination for raw bands is3 - 4 - 7, and best combination for ratios band is 4/5 - 1/4 - 2/5.Iterative Self Organizing Data Analysis (ISODATA) method has beenadopted as unsupervised classification, and Maximum Likelihood method assupervised classification. The overall accuracies are 87.18%, 89.45%, 89.26%,and 89.52% for raw bands, band ratios, Tasseled Cap, and PCA respectively,which showed that transformation techniques give good spectral enhancementsand feature extraction which are undistinguishable in raw image, and representgood tools to increase the accuracy of classification.

محاكاة العين البشرية باستخدام الخوارزمية الجينية == SIMULATION OF HUMAN EYE USING GENETIC ALGORITHEM

Author name: لؤي عبد الصاحب رسول الطائي
Supervisor name: سهى موسى خورشيد الاوسي | محمد صاحب الطائي
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: The aim of this research is simulate an optical system for the human eye using Genetic algorithm. The considered optical characteristics of the optical system simulator include spot size (Z), spot diagram, and effective focal length (EFL). These characteristics are determined with the aid of some mathematical relations, which give the efficiency and accuracy of the adopted optical system design. The work has been performed in two stages : In the first stage, Genetic Algorithem optimization (GA) is used to get the best design by optimizing the optical featurs of the eye elements. The optimal eye design was tested using Zemax software, the test includes estimation of the image quality, and optimal performance for the proposed optical eye system.The second stage was implementing a specially developed software to simulate the behavior of the human eye. The simulator using visual basic 6 and works under Windows operating system, it is able to plot the eye design graphically, and can estimate the considered optical functions to determine the efficiency of the eye simulator.The simulator showed agood results for spot size, spot diagram and EFL, the present work has been gained some credibility when the considered optical functions achieved by the simulator are found compatible with those achieved by Zemax, since the comparison showed a behavioral matching between them, which ensure the correct path of the GA based eye design and the successful proposed eye design.

دراسة قدرة الايقاف والمدى للبروتونات == Study of Stopping Power and Range for Protons

Author name: مصطفى عبد المحسن عبد العالي
Supervisor name: محمد احمد صالح
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: The calculation of the value of stopping power and the range for the proton is done by two ways : first, using Bethe - Bloch formula and second, using Bragg - Kleeman rule. The differences between the experimental and theoretical values of stopping power and range required studying the corrections for Bethe - Bloch formula which are represented by the maximum energy and density correction and then comparing the results with experimental values. Using these two formulas it has been found that the results computed by the Bethe - Bloch formula without corrections (maximum energy and density correction) are in agreement with experimental results for βγ ≤ 2 ( E ≤ 2×103MeV ) and for βγ ≤ 102 ( E ≤ 105MeV ) with corrections. The maximum energy and density corrections contributed to decrease the difference with the experimental results for βγ ≥ 102 ( E ≥ 105MeV ).The values of stopping power computed using the Bragg - Kleeman rule are in agreement with experimental results for E ≤ 200MeV and the range values computed using the Bragg - Kleeman rule are in agreement with the results computed using the Bethe - Bloch formula for E ≤ 400MeV .The results show that the energy losses for protons at the high energy values are low and vise versa; the energy losses for protons at the low energy values are high.The present calculations confirm that the proton looses its largest energy at the end of its path in matter

تاثير المعاملة الحرارية على بعض الخواص الميكانيكية للمتراكب المنيوم - كاربيد البورون == Effect of heat treatment on some mechanical properties of Aluminum - Boron carbide composites

Author name: لمى جمال عباس الرماحي
Supervisor name: قاصد عبد الستار صالح الجنابي | سعد رحمة الله
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: Aluminum matrix composites reinforced with boron carbide are currently employed in the nuclear industry. It's used as a control rod in nuclear reactors; Since B4C has very high absorption cross section for thermal neutrons. The objective of this work is to study the effect of heat treatment on the mechanical properties of the Al - B4C metal matrix composites prepared by powder metallurgy techniques. Compressibility was measured with the Al powder. The chosen compaction pressure was 2500psi. Samples were prepared by adding 5%, 10%wt B4C to Al as well as the Al powder. Sinterability was evaluated at different temperatures (400,450,500,550,600,650°C) during 2, 4, 6, 8; 10 hr for soaking time.Mechanical test were evaluated, showed little improvement in hardness, compressive strength and young's modulus in temperatures 400,450,500,550°C, and significant improvement in hardness and compressive strength in temperatures 600and 650°C, and also improvement to the elastic modulus. Specific samples were irradiated by neutron source, and mechanical tests showed little decrease in their mechanical properties (hardness and compressive strength) due to low neutron fluence available that gives insignificant effec

اثر التلدين على الخواص البصرية لاغشية اوكسيد الالمنيوم (Al2O3) الرقيقة المحضرة بطريقة الترسيب الكيميائي الحراري == The effect of annealing on the optical properties of (Al2O3) thin films prepared by chemical spray pyrolysis

Author name: عبير كمال جعفر
Supervisor name: خضير عباس مشجل | ابتسام محي عبد العزيز
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: The recent study deal with the structural and optical properties of Al2O3 thin films prepared by the chemical spray pyrolysis technique at glass substrate(450°C) and studying the effect of annealing at different temperatures (500,550,600) °C on the optical properties.The results of X - ray diffraction showed that the prepared films are polycrystalline, the study of optical properties included the record of transmittance spectrum of the films with the wavelengths range from (300 - 900)nm, and then measuring the forbidden energy gap of electronic transitions where it was found that the values of the forbidden energy gap of both allowed and forbidden transitions are (3.4)eV and (2.5)eV successively and it was (1.6)eV for the allowed indirect transition. When annealing the Al2O3 thin films, the values of the forbidden energy gap of the allowed and forbidden of direct transitions are (2.7)eV and (3.6)eV and it is (1.9)eV for the allowed indirect transition. Also, absorption coefficient , reflectance and optical constants such as extinction coefficient, refractive index, dielectric constants with it's two parts real and imaginary and optical conductivity as a function of photon energy have been studied, the study showed that the annealing caused an increase in energy gap values, reflectance, transmittance, refractive index and real part of dielectric constant, and a decrease in the values of absorptance, absorption coefficient, extinction coefficient, imaginary part of dielectric constant and the optical conductivity.

نموذج بطارية باستخدام برامجيات PSPICE مع مغير شحن ثنائي الاتجاه == Pspice Battery Model with Bidirectional Charging Converter

Author name: زينة موفق قدوري حسين العزاوي
Supervisor name: زينب منذر يونس كبة
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: This research intents to design Bidirectional Converter that can be used in wide applications from uninterrupted power supplies (UPS), photovoltaic (PV) and battery charging and discharging system, to auxiliary power supplies designed primarily with a general module depending on Orcad PSPICE program.Lead Acid battery model (12V) is putted, which is used in wide applications. The model consists of charge efficiency and battery voltage components. The charge efficiency factor can vary from (0 to 1) and is dependent on the Battery State of charge and charge current. The voltage component of the model consists of amp - hour integrator which tracks the net current flowing into the battery terminal (Battery voltage). The output of the integrator gives us the state of charge so, it is connected to a table driven voltage source, ETABLE, which generates the equivalent open circuit battery voltage. The method used here is implemented in orcad PSPICE program with bidirectional converter of properties (D=0.4, P=12W, Vo=12V, f=1 KHz, Io=1A).

دراسة لجودة الصورة للعين البشرية == A Study of the Image Quality for Human Eye

Author name: ازهار عويد كاظم
Supervisor name: صلاح عبد الحميد صالح
General topic: Physics
Specific topic: Physics
Degree: Master
University: Al-Nahrain University - College Of Science - Physics Department
Language: English
University location: Baghdad
First pages:
Abstract: The study of the effect of some factors on the human is difficult and complex because of the lack of instruments for measuring eye efficiency.The human eye is an optical organ, its work is similar to the camera work, but the eye can not return the image which it makes, but the camer a can return. Producing high quality image by human optical system like other lens system is affected by many parameters, some of them are internal such as aberrations and age, pigmentation. Also human eyes suffer from some defects that effect the human eye image quality, some of these defects are : 1. Hypermetropia (Long sightedness)2. Myopia (short sightedness) 3. Some other defects The optical characteristics of human eye imaging system are studied quantitatively via experimental and computer modeling. Experimental work is carried out to study the effect of spatial frequencies, color and ages on image eye quality. Computer simulations models are carried out to study the limitations imposed by imaging in the human eye. Theselimitations include the diameter of pupil eye, the aberrations (astigmatism and spherical), age, and pigmentation of eye. These limitations are computed in terms of modulation transfer function (MTF).The results showed that MTF curves are suitable for determining image quality and the limitions effect on imaging system. Also result showed a coincidence between laboratory work and theortical calculation of MTF for age, pigmentation, pupil size and aberrations
1 2 3 4