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alkej-110
Experimental Investigation of the Effect of Curvature Ratio on Heat Transfer in Double Pipe Helical Heat Exchanger
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Different parameters of double pipe helical coil were investigation experimentally. Four coils were used; three with a curvature ratio (0.037, 0.031, and 0.028) and 11mm diameter of the inner tube while the fourth with 0.033 curvature ratio and 13 mm diameter of the inner tube. The hot water flow in the inner tube whereas the cold water flows in the annulus. The inlet temperatures of hot and cold water are 50 0C and 18 0C respectively. The inner mass flow rate ranges from 0.0167 to 0.0583 kg/s. The results show the Nusselt number increase with increase curvature ratio. The Nusselt number of the coil with 0.037 curvature ratio increases by approximately 12.3 % as compare with 0.028 curvature ratio. The results also reveal that the Nusselt number of the coil with curvature ratio 0.033 increases by approximately 11.6 % as compare with 0.028 curvature ratio for 400 mm coil diameter.

 

 

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Publication Date
Wed Mar 08 2017
Journal Name
Ibn Al-haitham Journal For Pure And Applied Sciences
Synthesis and Characterization of [Benzyl (2-hydroxy-1naphthylidene) hydrazine carbodithioate] and Its Metal Complexes With [Co(II), Ni(II), Cu(II), Zn(II), and Cd(II)] Ions
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  The formation of  Co(II), Ni(II), Cu(II), Zn(II), and Cd(II)-complexes (C1-C5) respectively was studied with new Schiff base ligand [benzyl(2-hydroxy-1-naphthalidene) hydrazine carbodithioate  derived from reaction of  2-hydroxy-1-naphthaldehyde and benzyl hydrazine carbodithioate. The suggested structures of the ligand and its complexes have been determined   by using C.H.N.S analyzer, thermal analysis, FT-IR, U.V-Visible, 1HNMR, 13CNMR , conductivity measurement , magnetic susceptibility and atomic absorption. According to these studies,  the ligand coordinates as  a tridentate with metal ions through nitrogen atom of azomethane , oxygen atom of  hydroxyl, and  sulfur atom of thione  

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Publication Date
Sun Dec 04 2016
Journal Name
Baghdad Science Journal
Synthesis, Spectral and Dyeing Performance Studies of 4-(2-Aminmo-5-nitro-phenylazo)-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one Complexes with Some Metal Ions
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The ligand 4-(2-aminmo-5-nitro-phenylazo)-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-one derived from 4-aminoantipyrine and 4-nitroaniline was synthesized. The synthesized ligand was characterized by 1HNMR, FT-IR, UV-Vis spectra and (C.H.N) analysis. Complexes of (YIII and LaIII ) with the ligand were prepared in aqueous ethanol with a 1:2 M:L ratio and at optimum pH. The prepared complexes were characterized by using flame atomic absorption, FT-IR, UV-Vis spectra,(C.H.N) analysis and conductivity measurement. The stoichiometry of complexes was studied by the mole ratio and job methods. A concentration range (1×10-4 - 3×10-4 M) obeyed Beer's law, the complex solutions show high values of molar absorption. On the basis of physicochemical

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Publication Date
Mon Sep 26 2022
Journal Name
جامعة بغداد/ كلية التربية للعلوم الصرفة - ابن الهيثم
مهارات التفكير المعرفي وعلاقته باليقظة العقلية لدى طلبة أقسام الرياضيات في كليات التربية
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Publication Date
Sun Sep 11 2022
Journal Name
جامعة بغداد/ كلية التربية للعلوم الصرفة - ابن الهيثم
التفكير التخيلي وعلاقته بالقراءة الستراتيجية والتحصيل في مادة الرياضيات لدى طلاب المرحلة الثانوية
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Publication Date
Thu Oct 07 2021
Journal Name
مجلة لارك للفلسفة واللسانيات والعلوم الاجتماعية
معايير النخبة الاكاديمية العراقية في التعرض للقنوات الفضائية الاخبارية الاجنبية الناطقة باللغة العربية
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Publication Date
Mon Jun 01 2020
Journal Name
مجلة جامعة الانبار لللعلوم القانونية والسياسية
تقويم قواعد إدارة الشركات في ضوء قانون الشركات العراقي رقم 21 لسنة 1997،
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تقويم قواعد إدارة الشركات في ضوء قانون الشركات العراقي رقم 21 لسنة 1997،

Publication Date
Sun Apr 02 2017
Journal Name
Journal Of Educational And Psychological Researches
" أثر استراتيجية الجيجسو في تحصيل مادة الجغرافيا وعمليات العلم لدى طالبات المرحلة الاعدادية"
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The goal of current researcher to know the impact of strategic Jigsaw in the collection of hypertext and geographic operations of science students at the preparatory stage And that by checking the following 1.There is no difference statistically significant at the significance level 0.05 between the experimental group students who were studying strategy Jigsaw and between the control group students who studied in the usual way traditional degrees in the average achievement in the subject of geographical 2.There is no difference statistically significant at the significance level 0.05 between the experimental group students who were studying strategy Jigsaw and between the control group students who studied in the usual way traditional av

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Publication Date
Mon Apr 30 2018
Journal Name
مجلة العلوم النفسية
دراسة تحليلية لمحتوى كتاب الفيزياء للصف الرابع العلمي في ضوء مفاهيم التنمية المستدامة
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ان هدف من هذا البحث هو تحليل محتوى كتاب الفيزياء للصف الرابع العلمي و المقرر تدريسه للعام الدراسي (2018-2017). ولتحقيق هذا الهدف، و بعد مراجعة الادب السابق في ضوء مفاهيم التنمية المستدامة، تم تطوير اداة تتضمن مفاهيم التنمية المستدامة وابعادها، حيث تكونت في صورتها النهائية من 51قضية فرعية موزعة بين المفاهيم الثلاثة الساسية: الاجتماعية، والاقتصادية، والبيئية .وبعد التأكد من صدق الاداة وثباتها، تم تحليل محتوى كتاب

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Publication Date
Sun Mar 26 2023
Journal Name
Arab Science Heritage Journal
آيات الصلاة والزكاة عند المفسر محمد دروزة في كتابه التفسير الحديث دراسة تربوية
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The basic goal of human creation is worship, the Almighty stated: { I created the jinn and mankind only to worship Me} Al-Dhariyat 56.  The basic worships by which we approach Allah Almighty are the praying and zakat, that they are significant because the praying  and zakat mostly come together in numerous Qur’anic verses. Being the praying is a Physical worship while zakat is a financial devotion, they have many educational effects explained by the writer Muhammad Darwaza in his interpretations of these two pillars of Islam that he has chosen them to be the subject of this research

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Publication Date
Sun Jan 03 2010
Journal Name
Journal Of Educational And Psychological Researches
اثر برنامج تدريبي في تعديل سلوك الانسحاب الاجتماعي لدى المتخلفين عقليا تخلفا بسيطاً
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الانسحاب الاجتماعي بغض النظر عن العوامل المسببة له قابل للعلاج حيث وضحت البحوث العلمية إمكانية الحد منه باستخدام أساليب تعديل السلوك .

وهو  نمط سلوكي شائع لدى معظم الفئات ان لم يكن كل فئات الاعاقة ،وينتج هذا النمط السلوكي الانسحاب الاجتماعي عن عوامل عدة فاذا الطفل يعاني من تلف في الجهاز العصبي المركزي فان هذا التلف قد يحول دون قيام الطفل بالنشاطات المطلوبة للعلاج. توضح البحوث العلمية ام

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