تحضیر و توصیف مادة لفح حراري شفافة راداریا

Modified resole resin/short silica fiber composite materials have been prepared. The resole resin was synthesized and then blended with Polyvinylbutyral (PVB) polymer with different weight ratios to reduce its brittleness. The mechanical, thermal and physical properties of Resol- PVB blends were studied to characterize these blends and select the most appropriate mixing ratio of polyvinyl butyral with resole resin, which was identified at 15 phr of polyvinyl butyral for every 100 parts of resole resin.

تحقيق خدمة shoutcast ضمن بيئة ubuntu وتحليل أدائها عن طريق wireshark

نقدم من خلال هذا المشروع دراسة عملية عن خدمات البث عبر الشبكة نحاكي من خلالها البث الإذاعي عبر الإنترنت ونتعرف على هذه الخدمة ضمن بيئة Shoutcast Server و تحليل أدائها عبر Wireshark و من ثم إجراء دراسة تقريبية لاستهلاك الطاقة ضمن الهواتف الذكية و بعض الحلول المتبعة للتخفيف من هذه المشكلة . انطلاقاً من التعرف على مفهوم Streaming و أنواع البروتوكولات المستخدمة في هذه العملية و من ثم كيفية تحقيقها عن طريق Shoutcast server و مشغل الموسيقا Winamp وذلك بعد التعرف بشكل نظري مفصل على الـ Shoutcast server ,انتهاءاً باستقبال الخدمة عبر أجهزة استقبال(Mobiles ) . عن طريق برنامج Wireshark نقوم بتحليل بروتوكول الخدمة السابقة وماهي أية عمله وما هو شكل البيانات التي يتعامل معها و من ثم تحليل أداء الخدمة وفق نماذج متعددة تشمل عدة حالات ( مستقبل واحد أو عدة مستقبلين ) مع تحديد قيم بارامترات التأخير والإنتاجية وغيرها من بارامترات جودة الخدمة . في القسم الأخير نقدم دراسة لمفهوم حفظ الطاقة ضمن البيئة المستخدمة من أجل الإضاءة على هذه المشكلة التي تعتبر تحدياً كبيراً أمام الهواتف الذكية عند استعراض Video أو Audio عبر الشبكات اللاسلكية مع تقديم بعض الاستراتيجيات التي تساهم في الحد من استهلاك الطاقة من قبل بطاريات الهواتف الذكية . تجدر الإشارة أن جميع القياسات تمّت ضمن بيئة شبكة حقيقية ( كما سنرى لاحقاً ) وليست عبر برامج محاكاة ، حيث فضلنا اتباع طريقة Measurement في تحليل الخدمة وذلك من أجل تقديم نتائج دقيقة و حقيقية قدر الإمكان .

2x2 MIMO LTE signal transmission over fiber optics using ROF technology

this research studies 2x2 MIMO LTE signal transmission from the main tower eNB and the relay node RN over single mode fiber using ROF technology and take advantage of the WDM technology, the results show the ability of ROF to accommodate MIMO communication with high efficiency. The network has been simulated and analyzed using Optisystem program, and the results were more than promising.

Analysis of Microwave Radio Link‘s parameters Using Fuzzy Logic Approach

This work aims to analyze the performance of the microwave radio link’s parameters used to connect different systems and intra systems. Fuzzy logic technique is used to study the difficulties of the radio link’s parameters based on type of modulation, and distance between the receiver and transmitter. Four parameters are used as an input parameters for the fuzzy logic system mainly: required power, the length of the microwave radio link, modulation type and the signal to noise ratio(S/N). The output parameter is determined to be the microwave link capacity. Analytical study to select the optimal microwave radio link parameters to examine the efficiency of the radio link capacity will be shown. Additionally, studying the input and output memberships of the microwave radio link parameters using fuzzy logic will be explained.

The Prosthesis Implant Current Status in the Treatment of the Aneurysm ofthe Abdominal Aorta

The concept of Intravascular Technology is an advanced stage of the Medical vascular diseases therapy due to the easy usage by surgeon and the little rescue it involves on patients comparing to the traditional surgery. In this study, we have discussed one of the most modern methods of the Treatment of the Aneurysm of the Abdominal Aorta using the internal prosthesis through the artery. This has been achieved via the femoral artery. We also identified the prosthesis patterns and the used methods to get through those arteries as well as identifying the main indications and the importance of selecting the suitable patients regarding their age and health status. We also carried out a comparison among many International studies involving the development and usage of this technology worldwide. Indeed this therapy involves high material cost but the results prove its importance in rescuing many patients' lives that are classified to be in high rescue within traditional surgery.

Flexible GSM Equalizer for User-Defined QoS, Based on Software Defined Radio

In the introduction of this paper, we present a background on SDR, in section 2, we give a quick demonstration of main GSM features and ways to improve QoS in it. After a short recognition of key fading effects in section 3, we analyze in section 4 the Soft Output Viterbi Algorithm used to perform equalization tasks in GSM. In sections 5 and 6, we use simulation results to effectively categorize variable parameters of the flexible equalizer upon user defined level of QoS. We show also the importance of such approach in effectively utilizing hardware resources dedicated for performing digital signal processing tasks, and in reducing power consumption required for these tasks.

Flexible Rake Receiver for User-Defined QoS Based on Software Defined Radio

In the introduction of this paper, we present a background on SDR, in section 2, we give a quick demonstration of main IS-95 features and ways to improve QoS in it. After a short recognition of key fading effects in section 3, we analyze in section 4 the principle of Rake reception. In section 5, we use simulation results to effectively categorize variable number of fingers of the flexible Rake receiver upon user defined level of QoS, and we show the importance of such approach in effectively utilizing hardware resources dedicated for performing digital signal processing tasks, and in reducing power consumption required for these tasks.