Abstract In practice, most SoCs are multiprocessor systems-on-chips (MPSoCs) because it is too difficult to design a complex system-on-chip without making use of multiple CPUs. MPSoCs are the latest picture of very large scale integration (VLSI) technology. The architecture of the system is generally tailored to the application rather than being a general-purpose chip. This in turn enforces designers to move beyond logic design into advanced computer architecture and parallel processing. In such architectures, cores are integrated via a custom or commercial interconnection network with a controller, timing and a function interface to the external world. Current state-of-the-art SoCs already embeds typical sub-systems such as digital signal processors (DSP), RAM, ROM, MPEG cores.The main goal of this thesis is to design an efficient switch for Fat-tree interconnection networks. In addition a useful survey study for interconnection networks architectures, technologies and routing algorithms was provided. The survey included in some details commonly used switching methods and virtual channel arrangements. The proposed switch structure has been validated by a software model.A set of algorithms and procedures have been developed to facilitate the switch functionality. Those procedures include the control of transmission of the packets from switch input buffer to switch output buffer and transferring packets from switch output buffer to neighboring switch input buffer. While the input/output link controllers take care of buffer assignments to flits (packet) and deals with buffer organization. More over, the algorithms include (i) the routing algorithm which is the least common ancestor routing algorithm, (ii) arbitration algorithm that based on round-robin technique.Therefore in this thesis we have proved the correctness of the functionality of the proposed switch in software model that have been written in C++ language. The obtained simulation results of the switch functionality in fat-tree of 16 nodes definitely declare the correctness of the proposed arbitration scheme as well as showing the efficiency of the routing algorithm. Finally, we can say that the fat-tree interconnection network is very good candidate to implement future NoC connectivity for current and future multiprocessor systems-on-chips (MPSoCs) designs due to its modular, flexible and regular structured design. In turn, these features are suitable as well for VLSI realizations.
أسماء شعبان العصار (2010)

Thin films of cobber doped ZnO have been prepared on glass substrate using the Sol-Gel spin coating technique. The effect of doping percentage of Cu to ZnO thin films on the optical properties and optical constants are concluded from absorption and transmission measurements which are obtained by using double beam UV-Visible 1800 spectrophotometer in the wavelength (300-800)nm. It was found that the transmittance increases with increasing the doping percentage (0.01, 0.02,0.03 and 0.04)mol%, while the Absorbance is decreased. The optical energy band gaps have been evaluated and their values seem to be decreased by increasing the doping concentration level in the range (0.01, 0.02, 0.03)mol% followed by a rise with increasing the doping level to 0.04mol%. arabic 17 English 84
Fawzeia Khamis(9-2020)

تأتي أهمية الطاقة الشمسية حيث أنها طاقة دائمة ونظيفة بيئياً، وكما هو معروف فالعديد من الأبحاث والدراسات التي تقوم بها الدول لتطوير وتحسين تقنية هذه الطاقات وتشمل التطبيقات الحرارية المباشرة وغيرها من الطاقات الكهروضوئية. في هذا البحث قمنا بدراسة مقارنة للأداء الحراري والكفاءة بين مجمعين شمسيين مستويين أحدهما يميل بزاوية قدرها (30.6˚) والأخرى في وضع أفقي بزاوية صفرية. من خلال تحليل النتائج والبيانات المتحصل عليها أثناء الدراسة تفيد أن أداء المجمعين كان واعداً ولكن بالنسبة للمجمع المائل بزاوية (30.6˚) كان الأداء الحراري والكفاءة أعلى من المجمع الآخر. Abstract Solar energy is an important and environmentally compatible source of renewable energy. Presently many researches development progress in developing countries towards the effective of solar energy technology, the major applications of solar collectors and solar photovolitive systems. In this work, presents the experimental studies of thermal characteristics of two flat plate collectors. Thermal energies and efficiencies were studied of both collectors. The comparison between considered tilted solar collector and horizontal solar collector is done. The results indicates that both collectors are promising but that the solar collector who is tilted by (30.6˚) have higher thermal and more efficiency.
صلاح حسن المختار العز ومي (2008)