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Comparisons of Mechanical Properties of sub-mm Lead Based and Lead Free Based Solder Using in Manufacturing of Printed Circuits
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Abstract

This study investigates the mechanical compression properties of tin-lead and lead-free alloy spherical balls, using more than 500 samples to identify statistical variability in the properties in each alloy. Isothermal aging was done to study and compare the aging effect on the microstructure and properties.

The results showed significant elastic and plastic anisotropy of tin phase in lead-free tin based solder and that was compared with simulation using a Crystal Plasticity Finite Element (CPEF) method that has the anisotropy of Sn installed. The results and experiments were in good agreement, indicating the range of values expected with anisotropic properties.

Keywords: Lead-free solder, composite solder, and aging.

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Publication Date
Tue Apr 01 2008
Journal Name
Journal Of Educational And Psychological Researches
الطفولة في العراق بين جهود التنمية وتحديـــات الوضــــع الراهــن قســم الخدمـة الاجتماعيـة
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      اهتمت المجتمعات العالمية في الآونة الأخير بفئة الأطفال ، ورعاية الطفولة وذلك لما لها من أهمية كبيرة في مستقبل المجتمع ، وتنميتة وتقدمه . لأنها يعتمد عليها في تقدم وتطور المجتمع فـي جميع المجالات الاقتصادية والاجتماعية والثقافية . ومن هنا ارتبطت الطفولة بالحياة برباط عضوي فالأطفال براعم الحياة ومع هذه البراعم تستمر الحياة لذلك اهتمت دول العالم بوضع البرامج وعقد المؤتمرات من اجل النهوض

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Publication Date
Thu Nov 01 2012
Journal Name
مجلة العلوم الادارية والاقتصادية
أستعمال التحليل الإحصائي لتقصي وضع الطفولة في العراق خلال الفترة 2006-2010
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أستعمال التحليل الإحصائي لتقصي وضع الطفولة في العراق خلال الفترة 2006-2010

Publication Date
Sun Jan 01 2017
Journal Name
Biomedical & Pharmacology Journal
Diode Laser Versus Scalpel Gingivectomy
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Different methods can be used to remove tissue during gingivectomy and produce a good gingival margin, the most common is the conventional gingivectomy which is done by the use of scalpel, now a day’s Laser is widely spread and can be used to perform surgeries. Materials and methods: 50 patients divided into two equal groups, Group 1 gingivectomy was done by Diode Laser, Group 2 gingivectomy was done by scalpel, plaque and gingival index were measured at 1st, 2nd and 3rd visit, swab were taken and sent foe detecting bacterial growth and biopsy were taken for histopathological examination. Group 1 show no significant differences in plaque and gingival means between the visits, the bacteriological examination showed no growth of bact

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Publication Date
Sun Jan 01 2023
Journal Name
مجلة البحوث التربوية والنفسية
المعتقدات السائدة نحو فايروس كورونا لدى طلبة جامعة بغداد
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Abstract The current research aims to identify the most prominent beliefs about coronavirus of Baghdad University students, as well as to identify the prominent beliefs toward coronavirus of male and female students. To achieve the research objectives, a questionnaire of (15) items was administered to a sample of (600) male and female students collected from ten different colleges at the university of Baghdad. The findings of the research illustrated that item (8) took priority as students believe there is a misleading about coronavirus spreading by governments, item (2) which indicated that coronavirus is man-made took level two, followed by item (10), it proposes that coronavirus emerged from the American military base in china. Additiona

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Publication Date
Sat Dec 31 2022
Journal Name
College Of Islamic Sciences
Weighting between the texts as the ruling when Imam Al-Salmi
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abstract:

Objectives: The study aims to reveal the approach of Imam Al-Salmi in the weighting between the apparently conflicting texts, and to show the extent of his agreement and disagreement with the rest of the fundamentalists, and does he have vocabulary that can be used to elicit legal rulings in modern contemporary issues?

Method: The method of induction and analysis is one of the main tools to reach the research results. The study resorted to following the sayings of Imam Al-Salmi in various sources and fatwas and standing on them, then analyzing and applying them to the various branches of jurisprudence in the various jurisprudential chapters.

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Publication Date
Fri Jun 30 2017
Journal Name
Journal Of Engineering
Aluminium Matrix Composites Fabricated by Friction Stir Processing A Review
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      Aluminum alloys widely use in production of the automobile and the aerospace because
they have low density, attractive mechanical properties with respect to their weight, better
corrosion and wear resistance, low thermal coefficient of expansion comparison with traditional
metals and alloys. Recently, researchers have shifted from single material to composite materials
to reduce weight and cost, improve quality, and high performance in structural materials.
Friction stir processing (FSP) has been successfully researched for manufacturing of metal
matrix composites (MMCs) and functional graded materials (FGMs), find out new possibilities
to chemically change the surfaces. It is shown th

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Publication Date
Sun Jun 30 2024
Journal Name
مجلة نسق
اثر استراتيجية هرم الافضلية في تحصيل مادة الكيمياء عند طلاب الصف الثاني المتوسط
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يهدف البحث الحالي التعرف على اسناتيجية هرم الافضلية في تحصيل طلاب الصف الثاني المتةسط لمادة الكيمياء ولتحقيق هدف البحث تم اتباع الننهج شبه التجريبي ذو الضبط الجزئي وتم تحديد مجتمع البحث بطلاب الصف الثاني في جميع المدارس المتوسطة والثانوية التابعة لمديرية تربية بابل قسم تربية المسيب

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Publication Date
Sat Dec 29 2018
Journal Name
Journal Of Planner And Development
اثر العامل الديني في تخطيط المدينة العربية والعمارة الاسلامية مدينة النجف الاشرف أنموذجاً
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Publication Date
Mon Jan 04 2021
Journal Name
مجلة دراسات وبحوث اعلامية مسار
تعرض جمهور مدينة بغداد للقنوات الفضائية الاسلامية المتخصصة ودوره في غرس الثقافة الدينية
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Publication Date
Sat Dec 07 2024
Journal Name
مجلة الدراسات المستدامة
توظيف القوة الناعمة في تنفيذ السياسة الخارجية الفرنسية اتجاه المنطقة العربية بعد 2017م
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توظيف القوة الناعمة في تنفيذ السياسة الخارجية الفرنسية اتجاه المنطقة العربية بعد 2017م

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