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Article
ALMA Study of the Lensed Galaxy SDP.81

Authors: Zamri Z. Abidin --- Zainab K. Naser Alla --- Sadeem Abbas Fadhil --- Jazeel H. Azeez
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2018 Volume: 00 Issue: 1 Pages: 69-71
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

In this paper we present high resolution data from Atacama Large Millimeter /sub-millimeter Array (ALMA) of CO (5-4) and CO (8-7) rotational transitions toward the gravitational lensed galaxy (SDP.81). We calculate the molecular gas mass in the clumpy region which is around 1.5109 Mʘ. We overly the CO(8- 7) and CO(5- 4) intensity distributions to calculate the brightness temperature ratio R85 at various region. The CO line ratio was in the range between 0.39 and 0.75 with an average value about 0.48. This line ratio suggests that most sub-millimeter galaxies, SMGs, include a significant proportion of extended, moderate-density, cool gas.

Keywords

Galaxies --- High redshift --- ALMA --- SDP.81.


Article
A Study of the mechanical properties of aluminum composite materials prepared by atomization process
دراسة الخواص الميكانيكية لمتراكبات الألمنيوم المحضرة بطريقة التذرية

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Abstract

Steel fiber aluminum matrix composites were prepared by atomization technique. Different air atomization conditions were considered; which were atomization pressure and distance between sample and nozzle. Tensile stress properties were studied. XRF and XRD techniques were used to study the primary compositions and the structure of the raw materials and the atomized products. The tensile results showed that the best reported tensile strength observed for an atomization pressure equal to 4 mbar and sample to nozzle distance equal to 12 cm. Young modulus results showed that the best result occurred with an air atomization pressure equal to 8 mbar and sample to nozzle distance equal to 16cm.

تم تحضير متراكبات أساس الألمنيوم المدعمة بألياف الفولاذ بطريقة التذرية. تم أخذ ظروف مختلفة لعملية التذرية بنظر الأعتبار وهي ضغط التذرية و المسافة بين العينة والمرذاذ. درس التأثير على خواص اجهاد الشد. تقنيات فلورة الأشعة السينية و حيود الأشعة السينية أستخدمت لدراسة التركيب الأولي و الخواص التركيبية للمواد الأولية والمواد الناتجة من الترذيذ. أظهرت نتائج الشد ان أفضل نتيجة موثقة لحد المرونة لوحظت عند ضغط تذرية يساوي mbar4 و عند بعد للعينة من المرذاذ يساوي cm12 . أما لمعامل يونك فكانت عند ضغط تذرية باستخدام الهواء يساوي mbar8 و عند بعد للعينة من المرذاذ يساوي cm16.

Keywords

MMCs --- Atomization --- Tensile.

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