Abstract - The objective of this paper is to develop a model for a fuel cell hydrogen vehicle driven by a brushless DC motor. A two leg directly coupled interleaved boost converter is used to power the motor from the fuel cell through a three-phase inverter. The studied system of the fuel-cell vehicle is designed and simulated using the commercial PSIM9 software. Due the presence of power converters, different harmonic components exist in the system, especially in the input voltage/current to the motor. The ripple contents of current and voltage at the fuel cell output and the motor input are estimated. An active power filter is designed in order to reduce the current and voltage harmonics of brushless DC motor. The instantaneous active and reactive current components id-iq control method is used in this study to lessen the harmonic contents at the input of the Brushless DC motor to the standard values.

Abstract - The objective of this paper is to develop a model for a fuel cell hydrogen vehicle driven by a brushless DC motor. A two leg directly coupled interleaved boost converter is used to power the motor from the fuel cell through a three-phase inverter. The studied system of the fuel-cell vehicle is designed and simulated using the commercial PSIM9 software. Due the presence of power converters, different harmonic components exist in the system, especially in the input voltage/current to the motor. The ripple contents of current and voltage at the fuel cell output and the motor input are estimated. An active power filter is designed in order to reduce the current and voltage harmonics of brushless DC motor. The instantaneous active and reactive current components id-iq control method is used in this study to lessen the harmonic contents at the input of the Brushless DC motor to the standard values.

Egyptian policymakers and researchers have been working to address the challenge of bridging the gap between limited water resources and the growing population’s needs for agricultural and food production. The National Great Project for Lining and Rehabilitation of All Open Canals of the Irrigation Network aims to reduce irrigation water losses through seepage, evaporation, and evapotranspiration. This study evaluated water losses from the Al Maanna canal network in the Assiut governorate, Middle Egypt, using empirical formulas and field ponding methods. The results show the Moleth–Worth formula was more compatible with field measurements, with estimated seepage losses of 2.07 and 2.20 million m³/month, respectively. Moreover, maximum evaporation and evapotranspiration losses were 0.086 and 1.133 million m³/month, respectively. Consequently, total water losses from the Al Maanna canal are estimated to be 3.42 million m³/month, accounting for 13.63% of the total discharge. After canal rehabilitation, evaporation and evapotranspiration losses significantly decreased, while seepage losses were lowered to 0.472 million m³/month, as estimated using the field ponding method. Hence, lining the Al Maanna canal network could reduce water losses by 84%, promoting lining processes that yield significant benefits such as moral, cultural, and environmental benefits. This approach outweighs implementation expenses and ensures a sustainable water supply.

One of the most important problems Egypt is facing nowadays is saving and controlling the limited available quantity of water and its quality for irrigation and other purposes. Such goals may be achieved through different types of diversion head structures across the river and in the entrance of other carrying canals. The construction of diversion head structures, which usually causes many technical problems, should have the objective of solving and overcoming to protect the structure from failure. The main problem occurs downstream. Such structures have the harmful effect of converting the potential energy gained in the upstream side to a kinetic energy in the downstream side. This energy must be dissipated shortly and safely as near as possible to the head structure to avoid its destructive effect. The hydraulic jump is the most effective tool for the dissipation of water energy, accelerating the forming of the hydraulic jump downstream such structures became essential for achieving our main goal. Using energy dissipaters on the soled apron in the downstream side of the structures was the main technique for accelerating the hydraulic jump formation and dissipating great amount of the residual harmful kinetic energy occurring downstream head structures. So early, many researchers investigated different types, shapes, and arrangements of such dissipaters to evaluate its efficiency in dissipating the water energy and accelerating the forming of the hydraulic jump. In fact, in our present study we will try to investigate some other shapes of energy dissipaters, which have not been studied enough, by evaluating its positive technical impact on: (i) percentage value of dissipating kinetic water energy; (ii) percentage value of increasing the dissolved oxygen (DO) content in the irrigation water, and improving its quality. The study is proposed to be held in the irrigation and hydraulic laboratory of the Civil department, Faculty of Engineering, Assiut University, using a movable bed tilting channel 20 m long, 30 cm wide, and 50 cm high, using fourteen types of curved dissipaters with different arrangements as shown in Table 2. It is worth mentioning that, in this first part of our paper, we will introduce a comparative analysis for the efficiency of different types of energy dissipaters available in the literature review. The most effective types of the previously studied dissipaters will be put in a comparison with our new dissipaters from the two above mentioned points of view, and the results will be presented in the second part of this paper later.

This paper presents the design of a CMOS low noise amplifier (LNA) with minimized group delay variations and optimized noise performance for ultra-wideband (UWB) applications. The proposed LNA employs a common source based current reuse topology. Through this configuration gain flatness of 12.25± 0.25 with noise figure (NF) less than 3.8 dB are achieved. This LNA achieves group delay variation of ±25 ps using the standard 0.18 µm CMOS technology. Weak Capacitive-Resistive shunt feedback technique is implemented across the input stage for wideband input matching. Series peaking with output resistive termination are adopted for group delay variations optimization. This UWB LNA has a measured 1dB compression point (P1dB) and an input third-order inter-modulation point (IIP3) of -7.0 dBm and 2.5 dBm respectively at 5.5 GHz. The implemented UWB LNA chip area is only 560 µm x 590 µm.

" أدارة وتشغيل السدود " وهى حلقة نقاشية علمية مفتوحة عن أدارة وتشغيل السدود ضم فعاليات المؤتمر الدولى الثالث عن المياه فى الدول العربية الذى عقد ببيروت بلبنان خلال شهر سبتمبر 2004 ، بغرض طرح وتبادر الخبرات والافكار العلمية والتقنية فى هذا المجال استثمارا لهذ التجمع الكبير من الخبراء و المهتمين والعاملين . وقد تم تقديم ملخصات لبعض أوراق العمل وطرحها للتقاش للتدقيق والتعديا الفنى ان لزم. وقد خرجت الحلقة النقاشية بالعديد من التوصيات والنتائج الهامة التى تسهم فى الأرتقاء بالأداء فى هذا القطاع .

" مادة صديقة للبيئة من بعض المخلفات الزراعية الضارة لتنقية مصادر المياه من الملوثات البترولية " وهى دراسة بحثية تطبيقية تتعلق بتقديم مادة جديدة صديقة للبيئة من بعض المخلفات الزراعية الضارة ، لتنقية مصادر المياه من الملوثات البترولية فنحقق هدفين هامين فى آن معا ، فا إلى جانب انتاج مادة جديدة ذات قيمة مضافة ، فأننا نتخلص من تلك المخلفات الزراعية الضارة .كما أن الدراسة تقدم حلولا تكنولوجية بسيطة يمكن أن تقوم على أساسها العديد من الصناعات البسيطة التى من الممكن أن تستوعب بعضا من الشباب العاطلين عن العمل .

"تكنولوجيا هندسية ، وتطبيقات تحت عنوان الأستفادة من مخلفات قصب السكر فى ازالة الزيوت من مصادر المياه " وهى ورقة علمية تعرض النتائج الدورية للمشروع البحثى المشترك مع جامعة تسكيجى الأمريكية لمحاولة الأستفادة من مخلفات قصب السكرفى ازالة الزيوت من مصادر المياه ، وذلك بأستخدام بعض المعالجات الهندسية والتكنولوجية لزيادة القدرة الامتصاصية لتلك المخلفات ، مع المعالجة الكيميائية التى تجعلها شرهة فى أمتصاص الزيوت ، ولا تمتص المياه .