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alkej-197
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
Thu Sep 30 2021
Journal Name
College Of Islamic Sciences
Islam's position on freedom according to John Stuart Mill
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The issue of freedom is the most prominent and distinctive issue of Western thought, which it reached after a long struggle. The English thinker John Stuart Mill is considered the most prominent Western thinker who elaborated on the issue of freedom, until his ideas on the issue of freedom became the semi-final formula for issues of freedom in Western thought, which revolve in their entirety on The individual has complete freedom as long as it does not harm others, and this freedom is controlled by law.

And if the freedoms he offered were not considered an achievement in Western thought; Freedom in Islam is a central and fundamental issue, and the details of freedoms in Islam have not been accomplished by anyone, but rather came

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Publication Date
Sun Jan 05 2014
Journal Name
Journal Of Educational And Psychological Researches
مشكلات الطلبة العراقيين الدارسين في أوكرانيا وعلاقاتها ببعض المتغيرات
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Chapter One

First, the importance of research and the need for him

Highlight the status of the nation and occupies a decent position among nations by what they offer for the good of humanity and tender, which is based mainly on the human and material wealth owned by the nation.

The investment of this wealth investment scientifically accurate based on the strong foundation that qualifies them to heights of glory, so stand out necessary development of all energies Alepeshriaaly the limit can not be considered as these energies fortune unless all elements of effective elements characterized by the positive interaction in various spheres of life and in the in

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Publication Date
Thu Aug 27 2020
Journal Name
Arab Science Heritage Journal
الفكر الإداري للإمام علي (عليه السلام) في سياسة الدولة
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  The political system during the reign of Imam Ali (peace be upon him) was based on explicit openness in its features and objectives away from misinformation, and built its foundations and foundations on the Koranic legislation, and enacted by the Prophet (peace be upon him), and the decent legislation required by humanity

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Publication Date
Tue Mar 15 2022
Journal Name
Arab Science Heritage Journal
الري والإصلاح الزراعي في العراق (1-132هـ/ 622-750م)
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The organization and development of the irrigation system and agrarian reform in Iraq had an impact on the diversity of its methods and uses

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Publication Date
Wed Jun 22 2022
Journal Name
Arab Science Heritage Journal
الإمام علي الهادي(ع) دراسة تحليلية في السيرة والمنهج
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God bestowed upon the Imams of the Ahl al-Bayt (peace be upon them) knowledge and wisdom, in addition to give them virtue as long as it was not given to anyone from the worlds. knowledge have been enriched from them that cause pride.

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Publication Date
Wed Sep 01 2010
Journal Name
Journal Of Economics And Administrative Sciences
مكافحة ظاهرة الفساد في إطار تكامل المحتويين الإداري والاستراتيجي
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ينقسم الاتجاه الأساسي الذي يجري مناقشته في هذه الورقة إلى مستويين: الأول يركز على تحديد مضمون العلاقة بين الشفافية والفساد، فضلا عن توضيح الدور الذي يمكن أن تؤديه أخلاقيات الأعمال، لتثار التساؤلات هي: هل أن الشفافية والفساد متغيرين مرتبطين معا؟ وهل تؤثر الشفافية في الفساد؟ وهل أن وجود الشفافية كفيل بإزاحة الفساد، أم نحتاج إلى شيء أخر يدعم عملية الشفافية؟ وإذا تم التحدث عن الشفافية كمصطلح بدون وجود مما

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Publication Date
Mon Jan 01 2018
Journal Name
مجلة دراسات محاسبية ومالية
إدارة المخاطر في الوحدات الإقتصادية الصناعية بإستعمال مخطط باريتو
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إدارة المخاطر في الوحدات الإقتصادية الصناعية بإستعمال مخطط باريتو

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Publication Date
Sat Jan 01 2000
Journal Name
مجلة العلوم الزراعية العراقية
تاثير بعض اوساط النمو في نمو وتزهير نبات الراننكيل
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Publication Date
Wed Feb 01 2006
Journal Name
Political Sciences Journal
ملامح من فكرة القانون الطبيعي في حضارة العراق القديم
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ملامح من فكرة القانون الطبيعي في حضارة العراق القديم

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Publication Date
Wed Dec 21 2022
Journal Name
التطورات المنهجية والمعرفية في العلوم السياسية: واقع العلوم السياسية في العراق والعالم العربي
دراسة أزمة أوكرانيا وتأثيرها في الوطن العربي والنظام العالمي
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تم ت داول مصطلح الأزمة ا دلولية في السياسية ا دلولية خال القرن التاسع عش ر لتحدي دا ملدة الانتقالية بين السلم والحرب سواء أ دت الأزمة إلى نشوب صراع مسلح أم مت ت ت سويتها بالطرق السلمية، وتع دالأزمة ا دلولية مرحلة مت هيدية ل لحرب وهي ا رملحلة التي يسعى فيها أ طرا فالأزمة إلى إبعاد احتمالية نشوء أ و اندلاع الحرب، فالأزمة ه ي مدة حرجة ومرحلة خطيرة بين وقتي السلم والحرب، إن العلاقات ا دلولية تكاد ت عيشأ زمات متلاحقة ع

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