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Article
Design and Manufacturing of Single Sloped Solar Still: Study the Effect of Inclination Angle and Water Depth on Still Performance

Author: Ali A. Aljubouri
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2017 Volume: 20 Issue: 2 Pages: 60-70
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

The most prominent factors that have a significant influence on the performance of solar distillation are the inclination angle of the solar still cover and the water depth within the still basin. This paper was investigated an experimental performance of a single solar still. Five single sloped solar stills were designed and fabricated to operate under Baghdad city weather condition during August 2016. The inner dimensions of each basin were 0.5x0.5 m. The glass covers were tilted at 20o, 31o, 45o and 50o with respect to the horizontal. The temperatures of the outer glass covers surfaces were measured. Also, this study presents an experimental investigation on the potable water collection amount with the water depths of 1, 2, 3, 5, and 7 cm into each still basin and the different glass lid inclination angles. The hourly amount of extracted drinkable water was monitored. The daily produced amounts of fresh water increased by reducing the tilt angle from 50o to 20o, and diminish of water depth in the basin from 7 cm to 1 cm. The highest total daily amount was 495 ml/day (~2 l/m2/day) for solar still with tilt angle of 20o and water depth of 1 cm.


Article
Manufacturing of Aluminum Foam as a Light Weight Structural Material

Authors: Safa Hasan Mohammed --- Ali A. Aljubouri
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 5 Part (B) Scientific Pages: 697-702
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study, aluminum foam was fabricated using sintering and dissolution process (SDP). Aluminum powder with a particle size (3.63μm) as a raw material was mixed with NaCl with a particle size between (212-400μm) as a space holderat different ratio (30, 40, 50 ,60, 70 and 80) wt. % and compacted at 200 MPa followed by sintering at 650° C for 2 hrs. The sintered samples were placed into hot water for 10 hrs to dissolve NaCl particles. Uniaxial compression test was carried out to determine the foam structure influence on plastic deformation and damage in the Al foam. The foam porosity increased from 28% to 81% for 30wt. % and 80wt. % of NaCl content respectively. The mechanical properties (compressive strength, yield stress and young’s modulus) decrease with increasing NaCl content.


Article
Zinc Oxide Nanowires Prepared by Oblique Angle Deposition Method

Authors: Wafaa K. Khalef --- Ali A. Aljubouri --- Hayfa G. Rashid
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2016 Volume: 12 Issue: 1 Pages: 3-9
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper presents a detailed study of the oblique deposition effect on the morphology, structure and optical properties of ZnO nanowires (NWs) prepared by the deposition of zinc metallic films on glass substrates at different angles (0, 50 and 70°) and then oxidized in air at 650°C. Highly transparent ZnO thin films were successfully prepared by the oblique angle deposition (OAD) technique on glass substrates at room temperature. Atomic force microscopy (AFM) results show that the sample obliquely deposited presented greater roughness as compared with normally deposited ZnO NWs (Ө=0). Optical measurements showed a sharp absorption edge, near 380 nm, in both normal and oblique films. When the oblique angle increased, the absorption edge of spectra demonstrated a red shift with a direct band gap (3.11eV). Scanning electron microscopy (SEM) results show that the OAD led to the formation of bent columnar ZnO NWs. These NWs were inclined from the substrate normal in a direction opposite to the incident vapor beam. Due to the OAD technique, surface diffusion enhanced the self-shadowing effect. When oblique Zn thin film was later oxidized in air at 650°C for a longer time, the ZnO NWs had a needle-like structure, as was clearly shown by SEM images obtained.


Article
Zinc Oxide Nanowires Prepared by Oblique Angle Deposition Method
أسلاك أوكسيد الزنك النانوية المحضرة بطريقة الترسيب بزاوية مائلة

Authors: Wafaa K. Khalef --- Ali A. Aljubouri --- Hayfa G. Rashid
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2017 Volume: 13 Issue: 1 Pages: 3-9
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This paper presents a detailed study of the oblique deposition effect on the morphology, structure and optical properties of ZnO nanowires (NWs) prepared by the deposition of zinc metallic films on glass substrates at different angles (0, 50 and 70°) and then oxidized in air at 650°C. Highly transparent ZnO thin films were successfully prepared by the oblique angle deposition (OAD) technique on glass substrates at room temperature. Atomic force microscopy (AFM) results show that the sample obliquely deposited presented greater roughness as compared with normally deposited ZnO NWs (Ө=0). Optical measurements showed a sharp absorption edge, near 380 nm, in both normal and oblique films. When the oblique angle increased, the absorption edge of spectra demonstrated a red shift with a direct band gap (3.11eV). Scanning electron microscopy (SEM) results show that the OAD led to the formation of bent columnar ZnO NWs. These NWs were inclined from the substrate normal in a direction opposite to the incident vapor beam. Due to the OAD technique, surface diffusion enhanced the self-shadowing effect. When oblique Zn thin film was later oxidized in air at 650°C for a longer time, the ZnO NWs had a needle-like structure, as was clearly shown by SEM images obtained.


Article
Selective Dissociation of Boron Isotop 11B by TEA CO2 Laser
التفكك الانتقائي لنظير البورون 11B بستخدام ليزر TEA CO2

Authors: Ali A. Aljubouri علي عبادي الطيف --- Faleh Hassan Hamza فالح حسن حمزة --- Hassan Hommadi Mohammed حسن حمادي محمد
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 5 Part (B) Scientific Pages: 157-162
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The infrared multiphoton dissociation of Boron Trichloride (BCl3) gas molecules by transfersly excited atmospheric (TEA) CO2 laser has been studied. BCl3 molecules irradiated with different lines of TEA CO2 laser which coincided with the frequency of the absorptionspectrum of 10BCl3 and 11BCl3 compounds at a 3  vibrational mode. The mixture of of 10BCl3 and 11BCl3 has been studied in the presence of oxygen (O2) gas, where O2 gas used as a scavenger gas of the dissociation products. The TEA CO2 laser used was tuned to the 10P(20)line of the 10.6 μm, which is in resonance with the 3  mode of 11BCl3. The mass spectrometer used in isotope ratio analysis of the compounds befor and after irradiation. The enrichmentcoefficient of 10B isotop obtained was about 1.1729.

بعد النجاح الذي حققته ليزرات الاشعة تحت الحمراء في المجالات البحثية والصناعية تمكن عدد من الباحثين من اللازمة لتفكك ( power density) وضع تحليلات نظرية لتفكك الجزيئات ثنائية الذرة ووجدوا ان كثافة القدرة .[1] 1011 1012W cm الجزيئة ثنائية الذرة بحدود 2 ومن خلال دراسة النشريات الخاصة بتقنية التفكك متعدد الفوتونات للجزيئات متعددة الذرات لوحظ ان ليزر ثاني اوكسيد الكربون النابض قد استخدم بصورة واسعة لاجراء مثل هذه الابحاث .BCl وفي عام 1970 تمكن مجموعة من الباحثين [ 2] من تسجيل طيف تألق مستمر عند تشعيع جزيئاتي غاز 3 ومن النتائج الهامة في هذا الموضوع هو ماتوصل اليه عدد من الباحثين ] 3[ وهي كون عملية .CO باشعة ليزر 2 التفكك متعدد الفوتونات عملية انتقاء نظائري. وفي عام 1975 تمكن مجموعة من الباحثين من دراسة تخصيب 109 ، وباستخدام محفز W cm نظائر البورون باستخدام ليزر ثاني اوكسيد الكربون النابض ذي كثافة قدرة 2 للتفاعل الضوئي ووجد بان كفاءة التخصيب تكون حساسة لنوع المادة المحفزة المستخدمة ] 4[. وانتقائية التفكك .] النابض المستخدم ] 5 CO تعتمد على تردد اشعة ليزر 2 هي جزيئة مثلثة مستوية، وهي من الجزيئات المتناظرة راسيا BCl ان جزيئة ثالث كلوريد البورون 3 فعالة في طيف رامان و  4 , 3 , 6[، ولها اربعة انماط اهتزازية 1 [ (Symmetric Top Oblate) المضغوطة 4 3 2 يمثل نمط الاهتزاز( . وتمتلك  فعالة في المنطقة تحت الحمراء من الطيف الكهرومغناطيسي ) حيث  , ,10BCl 11 لذلك يوجد مركبان من غاز ثالث كلوريد البورون وهما 3 B 10 و B نظيرين للبورون هما BCl جزيئات 3 .] 11 ، ولكل مركب حزم امتصاص للاشعة تحت الحمراء تختلف عن حزم الامتصاص للنظيرالاخر ] 7 BCl و 3 10P) عند تردد الخط ) 10 CO 11 يتطابق مع طيف انبعاث اشعة ليزر 2 BCl وان طيف الامتصاص للمركب 3 (956 cm-1.(995 cm-1) 10R ) 10 يتطابق مع تردد الخط ) 30 BCl ( وطيف الامتصاص للمركب

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