In this work, functionally graded materials were synthesized by centrifugal technique at different
volume fractions 0.5, 1, 1.5, and 2% Vf with a rotation speed of 1200 rpm and a constant rotation time, T
= 6 min . The mechanical properties were characterized to study the graded and non-graded nanocomposites
and the pure epoxy material. The mechanical tests showed that graded and non-graded added alumina
(Al2O3) nanoparticles enhanced the effect more than pure epoxy. The maximum difference in impact strength
occurred at (FGM), which was loaded from the rich side of the nano-alumina where the maximum value was
at 1% Vf by 133.33% of the sample epoxy side. The flexural strength and Young modulus of the functionally
graded samples were enhanced by 43.69% and 52.74%, respectively, if loaded from the alumina-rich side.
On the other hand, when loading (FGM) from the epoxy side, the amount of decrease in bending resistance
was 122.4% while the improvement in bending modulus was 81.11% compared to pure epoxy. Scanning
electron microscopy (SEM) revealed the fracture surface of the impact samples and the gradient scattering of
nanoparticles in the epoxy matrix. Numerous applications can be used to manufacture the functionally
graded material by centrifugal casting method, including for the manufacture of gears and all bending
applications such as leaf springs.
The relation ship between Syria and Lebanon is a distinguished one
because of the cultural social geographic and historical common factors. So
that, Syria considers that Lebanon has a stratieyical depth for it, especially its
conflict with (Israel) does end and parts of its lands still under the occupation
of the Zionist thus, any conflict in Lebanon between parties and ethnics
groups could be considered an important influence on the bases of the Syrian
policy. Moreover the issue of Palestine which is considered the central issue
for Syria and Arab as whole. In addition to some of the political movements
that happened in the region itself. It could be said that Syrian interference in
Lebanon has a positive infl
Iraq is highly dependent on international markets to provide food for its residents. As imported food prices are highly dependent on crude oil prices in global markets, any shock in oil prices will have an impact on food consumption in the country. As a result, it is essential to study the demand for imported food at every time period. To the best of our knowledge as researchers, as not even a single study is available in the literature, this paper is considered the first to study the demand for imported food groups in Iraq. Therefore, the main objective of this research is to estimate demand elasticities for several imported food categories in Iraq. This study uses an Almost Ideal Demand System model to analyze the demand for imported f
... Show MoreThere are many researches deals with constructing an efficient solutions for real problem having Multi - objective confronted with each others. In this paper we construct a decision for Multi – objectives based on building a mathematical model formulating a unique objective function by combining the confronted objectives functions. Also we are presented some theories concerning this problem. Areal application problem has been presented to show the efficiency of the performance of our model and the method. Finally we obtained some results by randomly generating some problems.
السياسة في الفلسفة الاسلامية : الفكر السياسي عند الفارابي
لقد أثارت فكرة القانون الطبيعي اهتمام الفقهاء والفلاسفة في الشرق والغرب ، القدامى منهم والمحدثون وشيدوا نظريات وأقاموا مناقشات حول فكرة القانون الطبيعي والطبيعة والعقل الطبيعي مما جعل هذه الفكرة تبدو إحدى المعطيات الأساسية للفكر الإنساني والتي لا يمكن تجاوزها في إي وقت أو في إي مكان. يبدو إن مفهوم القانون الطبيعي وان كان يعد من اعرق المفاهيم الفلسفية إلا انه يعد واحد من تلك المفاهيم التي وان احتفظت بجوهرها
... Show MoreLand beyond the river has the attention of historians, especially travelers and geographers of its various regions under the Islamic Arab state. They antedate the social and economic aspects, including agriculture, industry and trade in their products and goods to other countries and urbanism, which we will address in our research
Somal is considered one of the unstable and restless African Arabian country in
comparison with other Arabian. It has been exposed to division and separation by
European colonization process that worked hardly on dividing this country according to
Berlin conference (1884-1885). Even after obtaining its independence during the sixties
and being led by civilian organizations which were unable to solve the problems of
Somalian society after obtaining the independence.
Somal continued its suffering even after the military rule under the leadership of
Mohammed Sayad Beree.
During Beree's rule, Somal suffered from the War with Ethiopia, as well as it
witnessed an economical Crisis. It suffered also from the tribal po
The social support is considered one of the most important constituents of
society and the one which can ensure its unity.
The resources of social support are different accordind to the variety and
the multiplication of the net – work of the social relationships that are
established among the individuals. The importance of this variable is evident
in the emolional adaptation and the mental health as well as its role in mitigating of the illness threating and in accelerating the recovery. social support can enhance the individuals ability to tolerate and face the emotional
and physical problems in the time of cris and stressful life conditions.
The most important results are shown as follows :
1- It was
يركز البحث على قصائد ماكسيمس للشاعر جارلس اولسن.تعتبر هذه القصائد ابداع غير تقليدي ونادر حيث استطاع الشاعر من خلالها ان ياخذ القارىء في عمليه مستمرة لشخصية واحدة في مكان واحد وهو جلوسستر.ان قصائد ماكسيمس مقسمة الى ثلاث مجلدات تقرأ كقصيدة واحدة . تقرأ هذه السلسلة من القصائد بسياق شخصي وسياسي ووجداني. تركز الدراسة على فكرة الوقت والمكان حيث تظهر القصائد بانوراما من المناظر الطبيعية والاشخاص والنماذج بصوره مس
... Show MorePraise be to God, prayer and peace upon our master Muhammad the Messenger of Allah peace be upon him mercy, gift, and grace, and rendered his family and the good righteous is followed until the Day of Judgment. After: The Koran