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Designing and Constructing the Strain Sensor Using Microbend Multimode Fiber
تصميم وبناء متحسس الإجهاد باستخدام خلية الانحناءات الدقيقة للألياف البصرية متعددة الأنماط

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Abstract

The microbend sensor is designed to experience a light loss when force is applied to the sensor. The periodic microbends cause propagating light to couple into higher order modes, the existing higher order modes become unguided modes. Three models of deform cells are fabricated at (3, 5, 8) mm pitchand tested by using MMF and laser source at 850 nm. The maximum output power of (8, 5, 3)mm model is (3, 2.7, 2.55)nW respectively at applied force 5N and the minimum value is (1.9, 1.65, 1.5)nW respectively at 60N.The strain is calculated at different microbend cells ,and the best sensitivity of this sensor for cell 8mm is equal to 0.6nW/N.

تم تصميم متحسس الانحناءات المايكروية لاحتساب خسارة الضوء عند تسليط قوة على متحسس..حيث تسببت الانحناءات المتكررة انتشار الضوء الى الأنماط أعلى. الأنماط الحالية تصبح انماط غير مرشدة .صنعت ثلاث نماذج من الخلايا الانحناءات المايكروية بدرجات تسنن 3,5,8)mm) وأختبرت بأستخدام ليف متعددة النمط ومصدر ليزربطول موجي (850 nm).حيث اعظم قدرة للخلايا (3,5,8mm)هي nW((2.55, 2.7, 3على التوالي عند تسليط قوة مقدارها 5N واقل قدرة تكون 1.9, 1.65, 1.5)nW)على التوالي عند تسليط قوة مقدارها60N . الاستطالة من مختلف خلاياالانحناءات المايكروية تم حسابها, أن أفضل تحسسيه للخلية 8mm تساوي 0.6nW/N.


Article
Entrance Surface Dose for patient`s undergoing X-ray examinations at Sebha medical center "Libya"

Authors: Y. A. Abdulla --- Osama B. Aljewaw
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2018 Volume: 59 Issue: 1C Pages: 489-493
Publisher: Baghdad University جامعة بغداد

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Abstract

Diagnostic X-ray is one of the ionizing radiation that plays an important role in medical examination. Despite its great benefit, it is considered the largest source of artificial radiation exposure to public. The aim of the study is to measure the entrance surface dose (ESD) of patients undergoing chest, lumber spine and knee X-ray examination using TLD-100. The mean Entrance surface dose of chest (PA), lumber spine (AP, LAT) and knee (AP, LAT) are 1.3mGy, 8.57mGy, 21.5mGy and 0.49mGy, 0.48mGy respectively. The ESDs measured were found to be higher than the published work.


Article
STUDY THE EFFECT OF MICROWAVE HEATING ON PHYSICAL PROPERTIES OF ASPHALT

Authors: Raad Yahya Faleh --- Wathiq Kareem Saleh --- Haider Salman Mohammed
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (Part-5) Pages: 127-135
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this work, the effect of microwave on asphalt (heating rat, resistance to deformation and retain stability) was examined. Two different asphalt samples were used. The first, standard asphalt (A) and the second one with %2 of sulfur in bitumen (B) have been exposed to microwave. The measured temperature on the surface showed an increase up to 120 ºC in 5 minutes for sample A, while it reached to 145 ºC for sample in the second cycle of exposure to microwave in the same time. The increase rate in temperature for B samples was slightly lower. The presence of sulfur in asphalt reinforced the physical properties and the asphalt became more resistant to water and rutting for sample B after exposure to microwave radiation. Theoretically, the rise of temperature was found to be (0.64 ºC/minute) for one ton of asphalt needing microwave power energy of 1000 watt, but practically, some of this energy loss can be attributed to the conductivity and the penetration of the wave out of asphalt region. This study proved that the better incident angle reducing this loss by using the equation ɵ=sin-1(x/(1/ α)), and was found to be 28ºC and 37ºC for sample A and B respectively. The results showed the possibility of using microwave radiation in repairing the damaged roads asphalt with economic effective and green method.

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