Abstract The conflict that took place in Libya in 2011, up to the present moment, has greatly affected the electrical power network and resulted in the rise of the voltage instability problem. This was due to loss of the some major transmission lines and certain generation units. Owing to the fact that the southern region of the Libyan network has no generation units, voltage drop phenomena has become a common problem as a result of the long transmission distance, which is approximately 750km. A proposed solution in order to solve this problem is via the utilization of small mobile generation units at the network weak points. This thesis revolves around discussing the voltage instability problem within the Libyan Network and how it can be enhanced when small and mobile generation units are connected to the network weak points. It will also establish and identify where the most weakened buses and regions are so that the mobile units should be connected for the attainment of optimized solution. Moreover, this solution was proposed as it can solve not only the voltage instability problem, but it will also solve the inadequacy in generation issue by circulating additional power within the network. Hence, reduce the load shedding phenomena. Furthermore, the thesis also includes future recommendations to improve and enhance the Libyan network by the addition of new 220kV and 400kV transmission lines that will enable the network to cope with the load growth in the future
ربيع محمد عمر (2014)

التصوير باستخدام طريقة المعاوقة الكهربائية كتقنية تستخدم لأخذ صورة مقطعية وذلك من خلال قياس الموصلية على سطح الجسم , بحيث تكون القيمة التقريبية لتوزيع المقاومة النوعية الداخلية مبنية عن طريق حساب فرق الجهد والتيار الكهربائي. التصوير المقطعي بالمعاوقة الكهربائية عند تردد معين يسمح بتصوير التغيرات فقط في الجزء الحقيقي من الموصلية ويهمل الجزء التخيلي منها والقيم المطلقة. وقد أقترح حلاً لهذه المشكلة باستخدام التصوير المقطعي متعدد التردد التصوير المقطعي بالمعوقة الكهربائية متعددة التردد يعطي صورة ثابتة بواسطة تكوين صورة لتغيير مقاومة الأنسجة مع التردد, ولغرض الحصول على كل المعلومات تم الأخذ في الاعتبار الجزء الحقيقي والتخيلي للموصلية في هذا البحت تم تطوير طريقة جديدة للتصوير الطبقي بالمعاوقة الكهربائية متعددة التردد باستخدام دوال لاجير الثنائية , وحيث أن تحسين صورة التصوير المقطعي بالمعاوقة الكهربائية يعتمد على كمية المعلومات التي يمكن الحصول عليها من القياسات الحدودية تم الأخذ في الاعتبار الجزء الحقيقي والتخيلي للموصلية لقد تم تطبيق هذه الطريقة والحصول على نتائج جيدة من حيث جودة الصورة مقارنة بنتائج تم الحصول عليها في أبحاث سابقة. Abstract Electrical Impedance Tomography (EIT) is a technique which allows cross- sectional image related to the electrical impedance within an object to be reconstructed from a set of measurements made on the object surface. EIT aims to image the conductivity distribution within a test object by making electrical measurements on the surface of the object. In single frequency Electrical Impedance Tomography only the change in the real part of the conductivity can be imaged and not those of the imaginary part of the conductivity or of the absolute values. Multi-frequency Electrical Impedance Tomography has been proposed to solve this problem. In this thesis, there is a new method using Laguerre function in multi-frequency Electrical Impedance Tomography which has been developed, and full information contained in the complex tissue conductivity can be obtained.
جلال مفتاح مهلهل (2009)

Abstract The increased amount of electromagnetic radiation in the environment has increased the common concern over the possible health risks of wireless devices (e.g. mobile phone ). However, to minimize the amount of energy absorbed by the user is an advantageous from the technical point of view, as well. The reduction of power absorbed by the user not only reduces any possible health hazards but also makes the antenna more efficient. In this master’s thesis, interaction between modern mobile phone antennas and user is studied by using numerical full-wave EM methods. The thesis aims at improving, understanding how mobile terminal antennas behave in the vicinity of the user and how different numerical EM methods can be used to solve the interaction problem. The results give valuable information for antenna designers in order to design antennas which have low interaction with the user as possible. Furthermore this master’s thesis introduces a simple optimization technique to enhance the performance of planar inverted F antenna (PIFA) one of common modern mobile phone antenna in vicinity of user and reduce its effect on health.
محمد على المنصورى (2008)